B039
Redox Biogeochemistry in the Thawing Arctic: Impacts on Carbon Cycling Across Physical and Chemical Gradients
Session ID#: 158848
Session Description:
Arctic and subarctic regions are experiencing dramatic hydrologic and biogeochemical change due to warming. Permafrost thaw and glacial melt release frozen substrates into active biogeochemical cycles and redistribute surface and subsurface water, altering redox-sensitive processes that influence carbon storage and transport. Oxygen concentrations and redox gradients change as a function of hydrology from soil pedon to watershed scales, impacting balances of terrestrial and aquatic carbon dioxide and methane fluxes. As the Arctic continues to change, it is imperative to understand how these disruptions to hydrology and redox cycling control carbon release and how to represent these processes in biogeochemical models that simulate future climate scenarios. This session welcomes submissions on Arctic redox processes – including hydrologic dynamics, nutrient transformations, and metal-mediated reactions – with a focus on carbon cycling across gradients. We invite field measurements, experimental studies, and model simulations to promote interdisciplinary discussion of these interconnected Arctic processes.
Index Terms:
0414 Biogeochemical cycles, processes, and modeling [BIOGEOSCIENCES]
0428 Carbon cycling [BIOGEOSCIENCES]
0470 Nutrients and nutrient cycling [BIOGEOSCIENCES]
0471 Oxidation/reduction reactions [BIOGEOSCIENCES]
Primary Convener: Elizabeth Herndon, Oak Ridge National Laboratory, Environmental Sciences Division, Oak Ridge, TN, United States
Conveners: Erin C Berns, Oak Ridge National Laboratory, Oak Ridge, TN, United States and Alexander B Michaud, Bigelow Laboratory for Ocean Sciences, East Boothbay, United States
Student/Early Career Convener: Chelsea Smith, Kent State University, Kent, United States
Redox Conditions Vary with Depth in Arctic Tundra Surface Soils (1055145)
Erin Rooney1, Sumant Avasarala1, Erin VanderJeugdt2, Imtiaz Miah3, Lauren E Kinsman-Costello2, Michael N Weintraub4 and Elizabeth Herndon1,5, (1)University of Tennessee, Knoxville, United States, (2)Kent State University, Kent, United States, (3)University of Toledo, Department of Environmental Sciences, Toledo, United States, (4)University of Toledo, Environmental Sciences, Toledo, United States, (5)Oak Ridge National Laboratory, Oak Ridge, United States
Water residence time controls iron-organic carbon interactions in waters draining a sub-Arctic fen (1088561)
Catherine Hirst1, Maëlle Villani1, Maxime Thomas1, Arthur Monhonval1, Eleonore du Bois d'Aische1, Erik Lundin2, Reiner Giesler3, Carl-Magnus Mörth4 and Sophie Opfergelt1, (1)Université Catholique de Louvain, Earth and Life Institute, Environmental Sciences, Louvain-La-Neuve, Belgium, (2)Swedish Polar Research Secretariat, Abisko, Sweden, (3)Umeå University, Climate Impacts Research Centre, Department of Ecology and Environmental Science, Umeå, Sweden, (4)Stockholm University, Department of Geological Sciences, Stockholm, Sweden
Iron Speciation and Mobility at the Permafrost-Active Layer Transition Zone (1117978)
Amanda J Barker1, Thomas Douglas1, Robyn Barbato2, Taylor D Sullivan3, Grace McInturff4, Shawn Glenn Gallaher5 and Joseph P Smith5, (1)Cold Regions Research and Engineering Laboratory Alaska, Fort Wainwright, AK, United States, (2)U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, NH, United States, (3)University of Wyoming, Laramie, WY, United States, (4)U.S. Coast Guard, Washington, DC, United States, (5)US Naval Academy, Oceanography, Annapolis, MD, United States
Feedbacks between permafrost thaw and oxidative weathering in the Arctic critical zone (1129453)
Marisa Nicole Repasch, University of Colorado Boulder, Institute of Arctic and Alpine Research, Boulder, United States, Suzanne P Anderson, Univ of Colorado, INSTAAR and Department of Geological Sciences, Boulder, United States, Joshua Koch, USGS Alaska Science Center, Anchorage, United States, Shaily Rahman, University of Colorado Boulder, Boulder, United States, Josie Arcuri, University of Colorado Boulder, INSTAAR and Department of Geological Sciences, Boulder, United States, Robert S Anderson, University of Colorado, INSTAAR and Department of Geological Sciences, Boulder, CO, United States and Irina Overeem, University of Colorado, Institute of Arctic and Alpine Research and Department of Geological Sciences, Boulder, CO, United States
How Do Early Diagenetic Processes In Arctic Fjord Sediments Change As Glaciers Retreat? (Invited) (1147114)
Laura Wehrmann, Stony Brook University, Stony Brook, NY, United States, Lisa Herbert, Rutgers University New Brunswick, New Brunswick, NJ, United States, Alexander B Michaud, Bigelow Laboratory for Ocean Sciences, East Boothbay, United States, Katja Laufer-Meiser, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, Natascha Riedinger, Oklahoma State University, Boone Pickens School of Geology, Stillwater, OK, United States, Grit Steinhoefel, Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research, Bremerhaven, Germany, Bo Barker Jørgensen, Aarhus University, Aarhus C, Denmark, Timothy Lyons, University of California Riverside, Department of Earth and Planetary Sciences, Riverside, CA, United States and Robert C Aller, SUNY StonyBrook, Stony Brook, NY, United States
Legacy Effects of Long-Term Water-Table Manipulation on Organic Matter Reduction and Methane Production in a Rich Fen (1158748)
Jessica E. RUSH1,2, Merritt R Turetsky2, Evan S Kane3, Jason Keller4, Kainani Tacazon4 and Jocelyn Valdivia4, (1)University of Colorado at Boulder, Ecology and Evolutionary Biology, Boulder, United States, (2)University of Colorado at Boulder, Institute of Arctic and Alpine Research, Boulder, United States, (3)Michigan Technological University, School of Forest Resources and Environmental Sciences, Houghton, MI, United States, (4)Chapman University, Schmid College of Science and Technology, Orange, United States
Influence of Groundwater Connectivity and Sulfate on Boreal Lake Methane Dynamics in the Sporadic Permafrost Zone (1161692)
McKenzie Ann Kuhn1,2, Jördis Stührenberg3, Cristian Estop Aragones4,5, Theresa Wilkes3, Tanja Broder6, Klaus-Holger Knorr6 and David Olefeldt7, (1)University of New Hampshire Main Campus, Department of Earth Sciences and Institute for the Study of Earth, Oceans, and Space, Durham, United States, (2)University of Alberta, Department of Renewable Resources, Edmonton, Canada, (3)University of Muenster, Münster, Germany, (4)University of Alberta, Edmonton, AB, Canada, (5)University of Münster, Münster, Germany, (6)University of Muenster, Muenster, Germany, (7)University of Alberta, Department of Renewable Resources, Edmonton, AB, Canada
Iron concentrations and speciation across a soil moisture and soil pH gradient in the arctic tundra and its impact on phosphate availability (1179770)
Erin VanderJeugdt1, Lauren E Kinsman-Costello1, Elizabeth Herndon2,3, Michael N Weintraub4, Imtiaz Miah5 and Sumant Avasarala6, (1)Kent State University, Kent, United States, (2)Oak Ridge National Laboratory, Oak Ridge, United States, (3)University of Tennessee, Knoxville, United States, (4)University of Toledo, Environmental Sciences, Toledo, United States, (5)University of Toledo, Department of Environmental Sciences, Toledo, United States, (6)University of Tennessee, Knoxvillle, United States
Microbial Iron Cycling Detection, Ecology, and Role in the Arctic Tundra (1180874)
Alexander B Michaud1, Remi Orion Masse1, Melody Lindsay1, Amy Doiron1,2, Nicholas Record1 and David Emerson1, (1)Bigelow Laboratory for Ocean Sciences, East Boothbay, United States, (2)Southern Maine Community College, South Portland, United States
Controls on Carbon Release from Arctic Thermokarst Landscapes: Changing Redox Conditions Driven by Soil Saturation and Drainage (1186796)
Erin C Berns, Oak Ridge National Laboratory, Oak Ridge, TN, United States, Teri O'Meara, Oak Ridge National Laboratory, Climate Change Science Institute and Environmental Sciences Division, Oak Ridge, United States, Elizabeth Herndon, Oak Ridge National Laboratory, Environmental Sciences Division, Oak Ridge, United States, Benjamin N Sulman, Oak Ridge National Laboratory, Knoxville, United States, Baohua Gu, Oak Ridge National Laboratory, Environmental Sciences Division, Oak Ridge, TN, United States and David E Graham, Oak Ridge National Lab, Biosciences Division, Oak Ridge, TN, United States
