FS1 - Lake outburst floods (LOFs): characteristics, imprints and risks
- Stella Moreiras – IANIGLA- Universidad de Cuyo, Argentine email@example.com
- Adam Emmer – Global Change Research Institute (CzechGlobe), the Czech Academy of Sciences, Czech Republic
- Pablo Iribarren Ancorena – Instituto de Ciencias de la Tierra. Facultad de Ciencias, Universidad Austral, Chile
High mountain lakes (glacial lakes, landslide-dammed lakes) may produce outburst floods when their dam fails or is overtopped. Their longevity varies from several hours / days to thousands of years, depending on many factors such dam characteristics and likelihood of triggering events (e.g., Costa and Schuster, 1988; Korup and Tweed, 2007). High magnitude lake outburst floods are capable to transform into hyperconcentrated flows by erosion and sediment entrainment from the valley, increasing mobilized volume, peak discharge and flood damage potential. Catastrophic lake outburst floods (LOFs) have been recorded in main mountain ranges worldwide, but their future impact (frequency and magnitude) in the context of climate change is yet unclear. Warming conditions related to global climate change force glacier retreat, resulting in formation and evolution of new potentially dangerous lakes. At the same time, increasing societal pressure (intensified use of land and water resources, population growth) raises vulnerability and exposure to lake outburst floods, especially in low-income mountainous countries. What we can learn from past events is key for future mitigation measures. Herein, we invite the research community to participate in this session and present advances in our understanding of past, present and future disaster risk reduction implications of lake outburst floods in a changing world. Our session welcomes (but is not strictly limited to) the following topics: 1)Inventories of lakes and past LOFs, 2) Hydrodynamics and geological imprints of LOFs, 3) Dam stability analysis, LOF hazard and risk assessment, 4) Impact of Anthropocene climate change on the occurrence and magnitude of LOFs, 5) LOFs modeling, 6)LOFs in tectonically active environments
FS2 - Lacustrine records of geological and hydrological hazards
- Jasper Moernaut, Innsbruck University, Austria, firstname.lastname@example.org
- Sebastien Bertrand, Ghent University, Belgium
- Stéphanie Girardclos , University of Geneva, Switzerland
- Prof. Dr. Achim Brauer (GFZ Potsdam, Telegrafenberg 14473 Potsdam, Germany)
Extreme geological and hydrological events can cause severe impacts on society and encompass a wide range of phenomena: i.e. earthquakes, landslides, tsunamis, volcanic activity, avalanches, floods and debris flows. Due to short instrumental records and typically long recurrence times of many of these extreme events, large uncertainties prevail in the assessment of their magnitude-frequency relations and spatial and temporal variability. Lacustrine sediments can form excellent continuous archives for reconstructing recurrence patterns of such extreme events and are increasingly used to improve hazard analyses in a multidisciplinary context. In this session, we welcome all contributions regarding the long-term analysis of geological and hydrological hazards with special emphasis on innovative proxies and approaches for extracting quantitative information (such as event magnitude) from lacustrine sediment records. Moreover, we particularly welcome contributions that aim at spatial integration of event records and at identification of longer-term consequences of extreme events on lacustrine sediment dynamics.
FS5 - Molecular applications and perspectives on modern and Quaternary environmental systems
- David J. Harning, Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, USA, email@example.com
- Bárbara Moguel, Geoscience Center, Universidad Nacional Autónoma de México, Juriquilla, Mexico Kathleen R. Stoof-Leichsenring, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Polar Terrestrial Environmental Systems, Potsdam, Germany
Recent scientific advances have enabled increasingly more efficient extraction and interpretation of molecular proxies for environment change, such as lipid biomarkers and ancient sedimentary DNA (sedaDNA), in sediment cores from terrestrial and marine archives. Along with refined modern calibrations and experiments, such as those from core tops, cultures, and micro/macrocosms, we are becoming better positioned to reconstruct and quantify the complex interactions between the climate, environment, and biodiversity throughout the Quaternary. However, despite their routine application in paleoclimate and -environmental studies, lipid biomarkers and sedaDNA have rarely been merged to create more holistic reconstructions. In this session, we invite contributions from studies that take advantage of multi-proxy molecular approaches to answer pressing questions related to Quaternary and modern environmental systems. While records of past climate and environments are one critical means to providing context for ongoing environmental scenarios, we recognize that these reconstructions also hinge on the quality of the given proxies. Therefore, we would like to place equal weight on the dissemination of novel and transformative proxy developments. By integrating our knowledge from these historically disparate disciplines (i.e., lipid biomarkers and sedaDNA), we hope to inspire and facilitate new avenues for collaboration and research that will benefit the progress of quantitative paleoclimate research in lake sediments.
FS6 - Varves records: from tracking natural and anthropogenically induced changes of the environment and climate to improving chronologies of past events
Adrian Palmer, Royal Holloway, University of London, UK, firstname.lastname@example.org
Pierre Francus, INRS, Quebec; Celia Martin Puertas, Royal Holloway, University of London, UK
Antii Ojala, Geological Survey of Finland, Turku, Finland
Varves, i.e. annual laminations in sedimentary records, are rare but exceptional archives of climatic and environmental changes because they contain their own internal, robust and continuous chronology, and hold high-resolution records sometimes down to the season. Varves appear in a variety of forms (clastic, biogenic and evaporitic) making their interpretation site-specific. In the context of climate change and its impact on natural and human systems, varves can provide high quality datasets for fellow scientists involved in forecasting the future and stakeholders. This session welcomes contributions about any aspect of the study of lacustrine varves. We invite contributions using varved records to (1) improve geochronological methods, (2) establish robust chronologies for paleolimnological and limnogeological research, (3) constrain the timing and the extent of regional events such as ice retreat and volcanic eruptions, (4) document changes in watersheds induced by recent and past human activities, (5) provide paleoclimatic and paleoenvironmental records, and records concerning the rates of transitions in proxy response; (6) describe process-studies of varve formation and preservation, (7) outline new analytical methodologies, for example achieving subannual temporal resolution, (8) report monitoring and calibration of the sedimentary record with instrumental data, and (9) undertake “forward modelling” to produce pseudo-varved sequences. This session will constitute a contribution to the PAGES-endorsed “Varve Working Group”.
FS7 - Beyond just research data: The value of outreach, education, equality, diversity and inclusion around lakes
- Liseth Pérez, Institut für Geosysteme und Bioindikation, TU Braunschweig, Germany email@example.com
- Avery Cook Shinneman, University of Washington, USA
- Fernanda Charqueño-Celis, CENAC-APN, Bariloche, Argentina
- Paula Echeverría-Galindo, Institut für Geosysteme und Bioindikation, TU Braunschweig, Germany
- Amy Myrbo, St. Croix Watershed Research Station, Science Museum of Minnesota, USA
- Paula de Tezanos Pinto. Instituto de Botánica Darwinion (IBODA)- Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Buenos Aires, Argentina.
Multidisciplinary studies in paleolimnology and limnogeology have great potential to address present and future socio-environmental problems, and more so when a diversity of stakeholders are engaged with generation, social context, and use of the data. Including youth, community partners, and agencies at the earliest stages of a project can impact the questions asked, the data generated, and the use of research for management and conservation of aquatic ecosystems, especially in developing countries. Engagement, however, requires more than just high-quality data and traditional dissemination methods, and can only be achieved when scientists include education and outreach activities and institute participatory processes early in the planning phase. Moreover, such projects have a larger impact and contribution if they embrace equity, diversity and inclusion as core ethical values: this enhancement and inclusiveness can motivate marginalized groups to participate in science whose contributions have previously been erased, or who have been excluded only due to their gender, race, nationality, age or sexual orientation. The goal of this session is to support and highlight work on inclusive and equitable research practices, including but not limited to 1) Pedagogical approaches for outreach and education in aspirational, ongoing, or finalized projects, 2) Demonstrated outcomes that involve local students, researchers, and communities in projects, especially in developing countries, areas governed by Indigenous people, and economically disadvantaged areas, 3) Studies highlighting disparities and underrepresentation of different groups (cultural, national) in our disciplines, 4) Best practices and strategies to break barriers to broader participation (mentoring programs, networks, funding schemes and opportunities, etc.), 5) Initiatives supporting participation of any minoritized groups, early-career researchers, and dual-career couples, and 6) Fun and creative outreach activities for people of all ages.
FS8 + FS 22- Limnogeology in Patagonia: Reconstructing the challenges of the living and non-living worlds throughout the Quaternary
- Gabriela Catalina Cusminsky, CRUB/Universidad Nacional del Comahue. INIBIOMA CONICET, San Carlos de Bariloche, Río Negro, Argentina firstname.lastname@example.org
- Nicolas Waldmann, The Dr. Moses Strauss Department of Marine Geosciences, Charney School of Marine Sciences, University of Haifa; Mount Carmel , 31905 Haifa, Israel.
- Daniel Ariztegui, Department of Earth Sciences, University of Geneva, Geneva Switzerland.
- Christoph Mayr, Institute of Geography, Friedrich-Alexander-Universitaet Erlangen-Nuernberg, Germany
- Ana Abarzua, Instituto de Ciencias de la Tierra, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
Understanding the impact of ongoing changes in climate is particularly important in environmentally fragile regions such as Patagonia. Climate models are crucial to predict future environmental reactions to these changes but often they struggle to capture local- and regional-scale changes. Paleoclimate reconstructions can be thus critical to validate and constrain the outcome of climate models, reducing uncertainties associated with making local or regional predictions. How do natural changes in climate during the Quaternary have challenged the living and non-living worlds and their recovery? In this session we invite contributions from lacustrine records in Patagonia using biological, geochemical and sedimentological proxies throughout the Quaternary. Quantitative and spatial assessments of rates of change as well as causes and consequences of long- and short-term climate variability are particularly welcome. Combined with robust age models these records are fundamental to understand the vulnerability and resilience of lacustrine systems while helping to improve predictions of future impact of environmental changes in Patagonia.
FS10 - The challenge of public communication of science in Limnology & Paleolimnology
- Fernanda Charqueño – CENAC-APN, Bariloche, Argentina, email@example.com
- Uara Carrillo – LDAAV-UNRN, Bariloche, Argentina
- Julieta Massaferro – CENAC-APN, Bariloche, Argentina
- Sandra Murriello – CITECDE-UNRN, Bariloche, Argentina
During the last decades the world’s water crisis, related to climate change, has been a relevant topic to all societies and for scientists around the world. However, public communication about these topics seems to be not accurate to create more awareness about the civilizatorian risks we are living. In this way, those problems bring out the lack of conscience, care and respect for fragile environments such as aquatic ecosystems.
Although public communication of science is an academic field and there are a lot of good practices around this topic, it is not spread as needed. The recent COVID pandemic situation led scientists to pay more attention to the importance of science communication, explaining in simple words or even images and using tools of easy access such as social media. We believe that scientific disciplines like Limnology or Paleolimnology, which are directly related to water and climate change, face the challenge to develop strategies to bridge the gap between science and society.
In the same line, art has also been a powerful tool to create amazing expressions and creative ways to turn complex concepts or theories into wonderful pieces of music, paints, multimedia developments or even theater plays and dances. Even when this practice is rather recent, this must be the beginning of a requirement in the scientific world.
In this session we welcome contributions from artists, scientists and science communicators about the topics of the Congress. Contributions should be related to projects focused on paleoscience but also about the world’s water crisis, water and communities, and water management. We are therefore interested in actual or future plans on the use of the social networks as tools of science communication or to integrate paleoscientists and their scientific products as papers, webinars or others.
FS12 - Lake biodiversity changes through time and space
- Sonia Fontana, Faculty of Resource Management, HAWK University of Applied Sciences and Arts, Göttingen, Germany firstname.lastname@example.org
- Lucia Espitia, Universidad Nacional de La Plata, CONICET, Argentina
- Silvina Stutz, Lab. Paleoecología y Palinología, IIMyC, CONICET – UNMDP, Mar del Plata, Argentina
Paleolimnological studies have provided evidence of biodiversity changes as a response to natural forces (i.e. climate change, volcanic eruptions) as well as human activities. Understanding the long-term dynamics of aquatic systems are important as a reference for recent anthropogenic pressures affecting their biodiversity and associated ecological functions. The proposed session aims to bring together scientists working on different proxies of environmental change research in lakes in order to contribute to resolving questions concerning how and the extent to which different stressors can influence their biodiversity and ecosystem services they provide. It is expected that the session will highlight novel palaeolimnological records and proxies, providing a new perspective on existing evidence of lake and landscape evolution.
FS13 - Linking the past and the present of Pampean shallow lakes to infer the future
- Guillermina Sanchez Vuichard, Lab. Paleoecología Y Palinología, IIMyC, CONICET –UNMdP, Mar del Plata, Argentina, email@example.com
- Maria Sofia Plastani, Instituto de Estudios Andinos “Don Pablo Groeber”, FCEyN, Universidad de Buenos Aires, Argentina
- Maria Laura Sanchez, Lab. Limnología, FCEyN, Universidad de Buenos Aires. Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA – CONICET/UBA), Argentina
Approximately 13,000 shallow lakes are found in the Pampean plain of Argentina. They are naturally nutrient-rich lakes but intensive agriculture, livestock farming and non-regulated urbanization have increased natural eutrophication during the last decades. Even though Pampean lakes provide numerous ecological services and are important reservoirs of biological diversity, only a few paleolimnological studies have reconstructed their long-term functioning and even fewer monitoring programs have accounted for their long-term evolution. High-resolution and multi-proxy analyses for the Holocene are still scarce.
The historical reconstruction of Pampean shallow lakes is crucial due to the modern impact of anthropogenic pressure on these ecosystems. To discriminate between natural and anthropogenic forcings is essential to better understand of the lakes’ dynamics, the communities’ structure, and the responses of biotic and abiotic variables to different forcings, as well as to establish their reference, non-degraded conditions. As a result of the increasing need to protect and restore these ecosystems, it is necessary to assess the extent of degradation compared to a state without anthropogenic influence.
Due to the particular characteristics of these shallow lakes, the combination of multi-proxy analyses with current ecological theories is necessary to reconstruct the changes occurring over decades and centuries, as well as to evaluate their responses to different forcings, allowing to design management measures in the face of growing anthropic pressure. Paleolimnologists have the opportunity to put more emphasis on the ecological information contained within the sedimentary record and could help improve the understanding of lacustrine ecosystems by testing ecological theories in the past and actively contributing to conservation decision-making. Contemporary ecological studies are used to build functioning theories, but these studies at most extend over tens of years and rarely show how lake ecosystems respond to ecological change on longer time scales. The aims of this session are: 1) to highlight the potential of using multiple variables in sediment cores to track the environmental changes shallow lakes of the pampa plain have been subjected to; 2) demonstrate that an integrated approach, combining palaeolimnological records and limnological data, can increase our understanding of changing ecological patterns and processes in Pampean shallow lakes.
FS15 - Subaqueous mass wasting in natural and artificial lakes: triggers, development and impacts
- Gustavo Villarosa, IPATEC (CONICET/UNCo), Universidad Nacional del Comahue, Argentina firstname.lastname@example.org
- Débora Beigt, IPATEC (CONICET/UNCo), Universidad Nacional del Comahue, Argentina
- Emmanuel Charpron, Université Toulouse Jean Jaurès, CNRS UMR 5602, Toulouse, France.
- Léo Chassiot, Université Laval, INRS-ETE, Québec, Canada
Subaqueous mass wasting is one of the most efficient mechanisms of sediment transport from coastal to deep lacustrine basins. Given that such events can directly impact coastal communities, infrastructure and human activities at littoral areas and are able to generate tsunamis, a deep understanding of the origin, dynamics and potential impacts of these processes has significant implications for geohazard and risk assessment at both natural and artificial lakes. The aim of this session is to provide a forum to discuss the latest accomplishments and advancements in the topic of subaqueous mass movements (including landslides, debris flows, turbidity currents, delta collapses, etc) in lacustrine environments, including but not limited to: conditioning mechanisms and potential triggers (including volcanic, seismic, sedimentary and anthropogenic triggers, among others), failure dynamics, sedimentary and geomorphic processes, slope stability and risk assessments, landslide-prone environments, tsunamigenic risk and modelling, geotechnical aspects of mass movements, tectonics and mass movements, instrumentation and methods for monitoring mass movements, etc. The understanding of these processes is especially interesting in systems located in geologic environments that are expected to be significantly affected by climate change (proglacial lakes, reservoirs in arid and semiarid regions, etc.) We particularly encourage to contribute with studies related to deltaic instability in natural lakes and reservoirs given that these environments are proven to be particularly landslide-prone areas.
FS16 - Sensitive high-altitude aquatic ecosystems on mountains and plateaux
- Paula Echeverría-Galindo, Institute of Geosystems and Bioindication, Technische Universität Braunschweig, Braunschweig, Germany, email@example.com
- Patricia Pérez, Institute of Investigations in Biodiversity and Environment, Universidad Nacional del Comahue, CONICET, Bariloche, Argentine
- Wengang Kang, Institute of Geosystems and Bioindication, Technische Universität Braunschweig, Braunschweig, Germany
High altitude environments represent one of the most sensitive habitats for ecosystems with adverse and heterogeneous environmental conditions. They host a unique diversity of wildlife that have faced adaptive challenges for their survival. There are a number of mountain ranges and high plateaus distributed across different climate zones on Earth (Rocky Mountains, Andes, Alps, Himalaya and Tibetan Plateau). These environments are crucial for regulating climate, and at the same time they are particularly sensitive to global warming. Even remote high altitude mountain environments are nowadays strongly affected by global climate change. The sensitivity of these high-altitude environments makes them suitable systems for observing and monitoring abiotic and biotic feedback mechanisms. Moreover, high altitude aquatic environments are ideal systems to address a broad range of topical themes in modern and paleoecology, because patterns and processes are both diverse and unique. Due to their potential as refuge sites and hot spots for many species, the study of aquatic environments in high-altitude areas is of great relevance. Thus, the objectives of this session are to address 1) modern ecology of extreme high-altitude lakes in mountain and plateau ecosystems: environmental features, community dynamics, species interactions and dispersal, trophic relations, energy flow processes, and 2) paleoecology (sedimentary records) and climate change effects on these environments: biota responses due to climate change, population extinction risks, lake resilience, functional adaptations to harsh aquatic environmental conditions, effects of glaciers melting, among others. The session seeks to combine our knowledge on high altitude mountain and plateau ecology and its evolution, and how changes in these environments may affect abiotic and biotic responses in aquatic communities through time and space. Moreover, we call for multidisciplinary contributions in order to integrate different aspects of extreme high-altitude mountain and plateau ecosystems and have further discussions regarding human impact, conservation and management of these sensitive environments.
FS17 - Linking Land and Water: Paleolimnological Reconstructions connecting Land Use with Limnological Change
- Matthew Waters, Auburn University, USA, firstname.lastname@example.org
- Mark Brenner, University of Florida, USA
Alteration to landscapes can drive limnological conditions such as eutrophication, stratification, brownification, and regime shifts. Where as many lake ecosystems are currently experiencing periods of extreme change, the onset of modern limnological conditions are typically linked to historic periods of landscape change from climate or human disturbance prior to modern monitoring efforts. The focus of this session will be to examine the role of historic disturbances to landscapes and how these disturbances serve as drivers of limnological conditions. Paleolimnological records from multiple timescales as well as periods of disturbance from ancient societies will be welcome in the session. Data from pre-disturbance periods are needed to set obtainable management targets and predict modern limnological change. We invite poster and oral presentations utilizing chemical, biological, and macrofossil records to determine the stressors from the landscape that cause change to lake systems. environments.
FS18 - Integrating process models into paleolimnological methods : Toward hindcast-forecast approaches to assess evolution of lake-watershed systems
- Jean-Philippe Jenny, CARRTEL, INRAE, France, Jean-Philippe.Jenny@inrae.fr
- Nathalie Dubois, EAWAG, Switzerland
- Laura Melo Vieira Soares, CARRTEL INRAE, France
Climate effects on lakes can be quantified most effectively by the integration of process-oriented limnological studies with paleolimnological research1. In this regard, process models have been widely implemented over the last years in limnological studies to investigate ecological or thermal dynamics occurring in aquatic systems and to question the future of lakes2–4. However, these models are almost non-existent in paleolimnological approaches so far, still limiting comprehensive hindcast and forecast of lake changes. For instance, thermal or ecological lake models are generally calibrated and validated against very few years of monitoring data, but not against longer timescales i.e. pluri-decadal, centennial or even millennial data. On long timescales though, integration of lake sediment records with process models could provide advanced techniques to enhance model-data validation, increase model robustness by adding new constraint to lake/watershed models, test new hypotheses adapted to longer timescales, provide more robust integrated approaches for long-term hindcast and forecast, afford for quantitative biogeochemical reconstructions, provide new time series of control or response variables that are not available in sediment records only. This session will provide a forum for researchers involved in hindcast and forecast studies to discuss numerical models of lake and/or watershed in the analyses of long-term changes of lake-watershed systems, and an opportunity to highlight the results of these essential surveys. Establishing larger collaborations on paleolimnological and modelling approaches may be needed for developing new analytical approaches but also for transferring knowledge from model simulations to lake managers to anticipate future changes in lakes and we welcome contributions of this nature as well.
FS19 - Degradation and restoration of deltas, wetlands, and floodplain lakes and ponds in the Anthropocene
- Lucy R. Roberts – Department of Ecoscience, Aarhus University, Denmark, email@example.com
- Heather L. Moorhouse – Lancaster Environment Centre, Lancaster University, UK
- Richard E. Walton – School of Geography, Politics and Sociology, Newcastle University, UK
- Andrew C.G. Henderson – School of Geography, Politics and Sociology, Newcastle University, UK
- Virginia N Panizzo – School of Geography, University of Nottingham, UK
- Jorge Salgado – School of Geography, University of Nottingham, UK
Deltas, wetlands, and floodplain lakes and ponds are some of the most diverse and productive aquatic ecosystems. Their hydrological regime, connectivity, and hydro-chemical variability over short spatial and temporal scales gives rise to a unique flora and fauna and provides numerous ecosystem services (including food and water security, fisheries, and natural protection from flooding and storms). However, in the Anthropocene these ecosystems are increasingly at risk from the intensification of human activity, population growth, sea level rise, and climatic variability. Consequently, more than a third of natural wetlands across inland and coastal environments have been lost since 1970. As a result of their natural variability and limited high- resolution monitoring, ‘baseline’ conditions have been hard to define and therefore the degree of degradation difficult to assess. Studies to understand the contemporary hydrological systematics, pollution, and biodiversity of sites alongside multi-proxy palaeolimnological studies using biological, geochemical and/or physical proxies offer the opportunity to inform the management and restoration of these ecosystems. This session aims to highlight investigations across a variety of temporal and spatial scales that extend our understanding of these complex environments and can provide new insights and techniques into the study of wetland ecosystems. We encourage modern calibrations, applications of palaeolimnology, and modelling studies that improve our understanding of hydrology and limnology, establish ‘baseline’ conditions, evaluate management practices, and assess the recovery or future degradation of inland and coastal deltas, wetlands, and floodplain lakes and ponds.
FS21 - Lakes as archives of the Anthropocene
- Laura Lopera Congote, Indiana University, US, firstname.lastname@example.org
- Larissa Schneider, School of Culture, History & Language, College of Asia & the Pacific, The Australian National University Canberra ACT 2600, Australia
Systematically measuring and identifying human influences on wetland ecosystems through time is key to determine the environmental changes from the Anthropocene. These changes have a unique nature and pace, requiring the integration of disciplines and techniques that can successfully trace anthropogenic markers. This session will focus on paleolimnological studies that integrate multidisciplinary lines of evidence to determine the onset, rate of change and amplitude of change related to the impact of human activity on wetlands. Exploring novel ways to integrate disciplines such as (but not exclusively) archaeology, history, geochemistry and paleoecology into paleolimnological analysis will lead to a more comprehensive understanding of the long-term legacy and effects of the Anthropocene on global wetlands.
FS23 - 2Kyr Lacustrine proxies of southern South America: understanding climate and anthropogenic impacts
- Alberto Araneda – Faculty of Environmental Sciences and Eula Chile Center, Universidad de Concepción, Chile, email@example.com
- Sergio Contregras Q., Faculty of Sciences, Universidad Católica de la Ssma Concepción, Chile
- Nathalie Fagel, AGEs-Clays, Sedimentary environments and Geochemistry, Department of Geology, Université de Liège, Belgium
- Denisse Alvarez S., Centro Bahía Lomas, Facultad de Ciencias, Universidad Santo Tomás, Chile
As indicated in many studies, southern South America (SSA) is one of the key areas in the world to study the fluctuations of Southern Westerlies Winds that are one of the most important climatic determinants because of its fluctuation in intensity and location provoke relevant changes in the precipitation regime of SSA. Many researchers are working in the area in different time frames and using many different proxies. However, in comparison to other key climate regions of the world, climate and environmental reconstructions of SSA are still poor.
This session is focused on past environmental changes and climate variability occurred within the last 2000 years because as indicated in worldwide research initiatives, is the time frame where climate variations are closer to the changes observed in the planet today and also is the period where the human impacts become evident (e.g. the Anthropocene).
Hence the principal aim of this session is to generate a space to discuss and integrate the information gathered for different proxies and findings on the natural climate variability in SSA. Our ultimate goal is to identify sensitive areas that amplify climatic signals and also to determine the most important human-forced changes in lacustrine environments.
Studies dealing with biological proxies, development and validation of organic and inorganic proxies, stable isotopes analysis, and its integration with sedimentological aspects are most welcome to this.
FS24 - Paleolimnology of high-latitude lakes: sensitive archives of past environmental change
- Dermot Antoniades, Université Laval, Canada, firstname.lastname@example.org
- Yohanna Klanten Université Laval, Canada
- Reinhard Pienitz Université Laval, Canada
- John P. Smol, Queen’s University, Canada
Ice-free landscapes in polar environments are frequently dominated by lakes and ponds. Particularly in the Northern Hemisphere, a large proportion of the overall landscape is often covered with surface water. Furthermore, in permafrost regions, the degradation of permafrost under warming scenarios is expected to cause major changes to surface hydrology. The greenhouse gas dynamics of lakes are also changing with this warming, with major implications for feedbacks in the global carbon cycle. Understanding the functioning of Arctic and Antarctic lakes, both in the present and the past, will help to refine our knowledge of these processes. It is equally well-established that high-latitude lakes are highly sensitive to climatic and other environmental changes. The sedimentary records of Arctic and Antarctic lakes are thus critical for understanding the dynamics of past global climate and environmental change.
This session aims to highlight recent progress in the application of paleolimnological techniques to high latitude lakes for the reconstruction of past natural and anthropogenic environmental change, on both short- and long-term timescales. We welcome contributions from authors working in both polar regions, including those studying biological, physical and geochemical changes in the sedimentary record.
FS26 - Arctic lakes: Archives of Quaternary paleoclimate, paleoglaciology, and paleoecology
- Sofia E. Kjellman, Dept. of Geosciences, UiT The Arctic University of Norway, Norway, email@example.com
- Anders Schomacker, Dept. of Geosciences, UiT The Arctic University of Norway, Norway
Arctic amplification is predicted to cause Arctic warming to exceed the global average by a factor of 2-3 within this century. With this follows changes in e.g., precipitation, sea ice, glacier mass balance, permafrost, and ecosystems. This highlights the need for knowledge of past climatic and environmental change in the Arctic. Hence, paleoclimate data from past warm periods are of particular interest. Arctic lakes are extremely responsive to climate change, making lacustrine sediments highly valuable archives of paleoenvironmental information. Analysis of proxy records from Arctic lake sediments are used to reconstruct temperature, precipitation, nutrient status, vegetation, glaciation history, sea-level change and much more.
This session welcomes a broad range of contributions focusing on Arctic lacustrine archives, geochronology, and proxy studies at different temporal and spatial scales, covering the Quaternary period. The aim of the session is to provide an overview of the state-of the-art of Arctic Quaternary environmental change based on lacustrine sedimentary archives and to identify outstanding research questions. We welcome both proxy-based studies and contributions from proxy system modeling that links process models to observations.
FS28 - Proglacial lakes
- Sebastien Bertrand, Renard Centre of Marine Geology, Ghent University, Belgium firstname.lastname@example.org
- Willem van der Bilt, University of Bergen, Norway
- Pablo Iribarren Anacona, Universidad Austral de Chile, Valdivia, Chile
Proglacial lakes are ubiquitous in presently glacierized and recently deglaciated regions. Their number and size tend to increase worldwide, in response to the general retreat of glaciers in the 21st century. Although they may be short-lived, proglacial lakes are able to modulate calving glacier dynamics and significantly decrease downstream sediment fluxes. Depending on the nature and stability of their dams, they may also be responsible for Glacial Lake Outburst Floods, which are among the most devastating natural hazards on Earth. In addition, the sediments deposited in proglacial lakes generally constitute high-resolution and continuous archives of climate and glacier variability, due to their typically high to very-high sediment accumulation rates. Although proglacial lakes are increasingly studied by the scientific community, modern lakes and proglacial sediment records are generally studied by distinct teams of scientists.
This session intends to gather scientists working on all aspects of proglacial lake research, from geomorphology and lake formation to natural hazards and sediment-based reconstructions of climate change and glacier variability. We welcome contributions on the rapidly changing conditions (number, size, …) of proglacial lakes, as well as those investigating proglacial lakes on geological timescales. For this session, the broad sense of the term “proglacial lake” is used, i.e., it is not limited to ice-contact or ice-marginal lakes, but it also includes lakes with smaller glaciers in their watersheds.
FS29 - Human Traces in the aquatic sedimentary record
- Émilie Saulnier-Talbot, Université Laval, Canada, email@example.com
- Members of the PAGES Human Traces Working Group
Human Traces is a PAGES (Past Global Changes) working group which aims to contextualize the Anthropocene Epoch in a long-term, global perspective by synthesizing records of human traces in geologic archives. The objective of this session is to present examples of how traces of human presence and activity manifest in aquatic sedimentary archives from different parts of the world, depending on regional aspects of natural and human-induced changes through time. We seek communications on any aspect of human traces in the sedimentary record of lakes, ponds, wetlands, and coasts. Data presented in this session will be considered for inclusion in the Human Traces database, a new resource that the working group is developing which aims to assemble information that will enable the establishment of temporal trends of human activity linked to environmental change across various spatial and temporal scales.
FS30 - Using Palaeolimnology to Understand Recent Human Impacts on Tropical Lakes
- Lilian Unger, University College London, UK firstname.lastname@example.org
- Suzanne McGowan, Institute of Ecology, The Netherlands
- Jorge Salgado, University of Nottingham, UK
- Virginia Panizzo, University of Nottingham, UK
Recent human impacts on tropical ecosystems have accelerated, as the resources that these habitats provide are relied upon globally. This is resulting in the loss of ecosystem services from these habitats. In many tropical countries, there is strong reliance on ecosystem services from freshwater systems, for example to provide clean water, food and other resources. Palaeolimnology can be used to determine the extent and effects of multiple pressures that might be occurring in the catchment, such as changes in land use, alien species introductions and contamination from pollutants. It can also be used to better understand how tropical lakes are structured and function and how they are responding to these pressures. The palaeo record is especially useful in the absence of long-term monitoring data, which is often lacking in remote, or under-studied tropical sites. Palaeo records from tropical sites are still vastly underrepresented compared to temperate records. This session will focus on the existing records from tropical lakes covering the last few thousand years and showcase the diverse applications of this work. It is hoped it will help palaeolimnological researchers of tropical lakes to better connect and, increase the visibility of this work.
FS31 - Rapid environmental change in tropical and subtropical lakes during the Holocene
- Liseth Pérez, Institut für Geosysteme und Bioindikation, TU Braunschweig, Germany, email@example.com
- Margarita Caballero, Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico
- Jonathan Obrist-Farner, Geosciences and Geological and Petroleum Engineering Department, Missouri University of Science and Technology, USA
- Mark Brenner, Department of Geological Sciences, and Land Use and Environmental Change Institute, University of Florida, Gainesville, Florida, USA
- Matthias Bücker, Institut für Geophysik und extraterrestrische Physik, TU Braunschweig, Germany
Tropical and subtropical regions possess numerous aquatic ecosystems that are threatened by climate change and human impacts. This is especially true of water bodies located in developing countries. Abrupt environmental events can cause profound ecological change, including biodiversity loss, and also threaten ecosystem services provided by these lakes, such as water provisioning, food supply, recreation, cultural practices and wildlife habitat. Low-latitude lakes are highly sensitive to environmental stressors and their sediments contain a record of past ecological and climate change. Nevertheless, the responses (magnitude and velocity) of tropical/subtropical freshwater ecosystems and their watersheds to abrupt environmental changes are not well understood.
We invite contributions from multiple disciplines (paleolimnology, limnogeology, hydrology, geochemistry, geophysics, geomorphology, geodesy, remote sensing, etc.) that explore the responses of low-latitude lakes to rapid Holocene environmental changes, caused by such processes as incursion of marine waters into coastal freshwater lagoons, cultural eutrophication, pollutant contamination, land use change and consequent soil erosion, subterranean lake drainage or lake desiccation, among others. These studies provide fundamental baseline information that can be used to help develop management strategies for freshwater ecosystems in tropical and subtropical regions.
FS32 - Environmental records of the Anthropocene in artificial lakes
- Silvana Raquel HALAC, CICTERRA, CONICET- Universidad Nacional de Córdoba, Argentina firstname.lastname@example.org
- Léo CHASSIOT, Université Laval, INRS-ETE, Canada, email@example.com
- Gabriela Ana ZANOR, Dept. de Ciencias Ambientales, Posgrado en Biociencias, División de Ciencias de la Vida (DICIVA), Universidad de Guanajuato, México
- Debora BEIGT, IPATEC (CONICET,UNCo), Universidad del Comahue, Argentina
- Gustavo VILLAROSA, IPATEC (CONICET,UNCo), Universidad del Comahue, Argentina
Man’s desire to control water resources has led to the creation of many artificial lakes that have played a vital role for human societies, providing irrigation, flood control, transportation, recreation, water supply, food, renewable energy and natural resources. Over the last decades, the global demand for water and resources has resulted in massive river damming, alteration of natural lakes and ponds, and digging of (gravel-)pit lakes. These human impacts have modified natural landscapes by disturbing river flows, water chemistry, biogeochemical cycles, and sediment transport from small mountainous catchments to floodplain and coastal areas. The importance of artificial lakes is now widely recognized as human actions overprint natural driving forces. However, despite their large distribution worldwide, and their significance for modern societies, mostly large reservoirs have received attention and the other types of artificial waterbodies remain poorly studied comparing to natural systems. In addition, reservoir studies are often conducted from a water resource management perspective, but rarely from a sediment management perspective, and these studies are often published in ‘grey’ literature.
To bridge these gaps, this session aims to document the specificities of all types of artificial lakes, from large reservoirs to small ponds, with relevance both to landscape management to the understanding of the Anthropocene environments. We welcome research conducted at multiple scales, from global modelling to multidisciplinary, integrated field studies for an overview of physical, chemical, and biological processes ruling artificial lakes and their catchments. The focus is on contemporary systems and their trends during the Anthropocene, with particular attention to the nature, magnitude and rate of change from natural systems to man-made environments. We strongly encourage abstract submissions that address: i) in-lake processes within the water column and at the water-sediment interface; ii) Anthropocene records of human activities in different pollution source environments; iii) sediment production, delivery, transfer, and storage within cascading systems; iv) morphological and hydrological changes resulting from the creation of artificial lakes and reservoirs; v) sedimentary and limnological characteristics of overlooked systems such as (gravel-)pit lakes, mining lakes, ponds, small dams and/or millstreams ; and vi) the relevance of artificial lakes in landscape management and sediment resources sustainability at the Anthropocene Era.
FS34 - Paleoenvironment and paleoclimate records from long-lived lakes and paleolakes
- Margarita Caballero, Laboratorio de Paleolimnología, Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico, firstname.lastname@example.org
- Hendrik Vogel, Institut für Geologie, Universität Bern, Switzerland.
- Liseth Pérez, Institut für Geosysteme und Bioindikation, TU-Braunschweig, Germany
- Nicolas Waldmann, Department of Marine Geosciences, University of Haifa, Israel
The increasing number of projects (incl. ICDP) targeting long lacustrine sedimentary records (in core or outcrop studies) across the world brings the opportunity to compare patterns of environmental and climate changes across wide geographical and temporal scales. This session aims to bring together contributions regarding any aspect of paleoenvironmental research on long (>50 kyr) lacustrine sedimentary records from around the world that can provide insights into the spatial and temporal character of major climate changes and environmental perturbations. We welcome multidisciplinary studies that combine physical, chemical and biological indicators.
FS35 - Ancient Lake Basins
- Cecilia Benavente, IANIGLA-CONICET FCEN-UNCUYO, Argentine, email@example.com
- Adriana Mancuso, IANIGLA-CONICET, Argentine
- Kevin Bohacs, KMBohacs Geoconsulting, USA
During the last two decades, significant progress has been made in understanding lake basin evolution through climatic and tectonic changes using sedimentology, sequence stratigraphy, geochemistry, hydrology, and watershed characteristics to interpret three main lake basin types: overfilled, underfilled, and balanced-fill. Groundwater constraints, however, have been mostly overlooked. The recent incorporation of subsurface water flow factors into lake basin analysis has led to the realization that more diverse and complex facies association can result from its influence, particularly in balanced-fill and underfilled lake basins. In addition, better understanding of paleohydrogeology of the lacustrine systems result from integrated analysis. We welcome all contributions that lead to an advance and a more complete view of the present lake basin type paradigm including groundwater flow and integrating modern analogues to understand ancient lake systems. Groundwater appears to have had a significant influence on the many lake systems that Mars hosted, especially early in the history of that planet. Extensive work from orbit has been augmented greatly with on-the-ground analyses, especially by roving scientific robots and new discoveries are being made to this day. Close examination of these data reveals many similarities with Earth systems as well as distinct differences. This session will also welcome contributions on Martian lake systems, especially in the context of lake-basin systems on Earth which enables prediction away from sample control and selection of appropriate analogues. Key aspects of lake systems to be considered include sediment and water delivery pathways (precipitation, overland, groundwater), components of potential accommodation, and conditions in the lake water column (lake-level changes, mixis, stratification).