B34B:
Terrestrial and Aquatic Responses to Changing Climate and Disturbance Regimes in Arctic and Sub-Arctic Regions III


Session ID#: 8597

Session Description:
High latitude ecosystems are undergoing rapid change as climate warms and alters disturbance regimes, particularly wildfire, permafrost thaw and insect outbreaks. Our understanding of ecosystem responses to these changes is complicated by strong feedbacks between biota and biogeochemical cycling. Remote sensing, change detection, and chronosequence studies are used to study ecosystem function under current and historical disturbance regimes. These approaches often vary between upland, wetland, and lake systems.  Across all systems, patterns of interannual and seasonal variation are key knowledge gaps.  This is particularly challenging for identifying trajectories of change across the landscape. Presentations are invited using remote sensing, long-term studies, or process-level experiments to improve our understanding of changes in ecosystem structure and function, for example variations in carbon and nutrient cycling, in the north.  This session will enable synergies and future collaborations of researchers working across terrestrial and aquatic arctic systems at multiple spatial and temporal scales.
Primary Convener:  Marion Syndonia Bret-Harte, University of Alaska Fairbanks, Institute of Arctic Biology, Fairbanks, AK, United States
Conveners:  Jeffrey R White, Indiana Univ-Environ Sciences, Bloomington, IN, United States, Merritt R Turetsky, Institute of Arctic and Alpine Research, Boulder, United States and Thomas A Douglas, Cold Regions Research and Engineering Laboratory Alaska, Fort Wainwright, AK, United States
Chairs:  Merritt R Turetsky, Institute of Arctic and Alpine Research, Boulder, United States and Thomas A Douglas, Cold Regions Research and Engineering Laboratory Alaska, Fort Wainwright, AK, United States
OSPA Liaison:  Merritt R Turetsky, Institute of Arctic and Alpine Research, Boulder, United States

Cross-Listed:
  • C - Cryosphere
  • GC - Global Environmental Change
Co-Sponsor(s):
  • IGBP: International Geosphere-Biosphere Programme -
Index Terms:

0414 Biogeochemical cycles, processes, and modeling [BIOGEOSCIENCES]
0428 Carbon cycling [BIOGEOSCIENCES]
0439 Ecosystems, structure and dynamics [BIOGEOSCIENCES]
0475 Permafrost, cryosphere, and high-latitude processes [BIOGEOSCIENCES]

Abstracts Submitted to this Session:

Controls of Methane Dynamics and Emissions in an Arctic Warming Experiment (73055)
Cecilie Skov Nielsen1, Bo Elberling2,3, Anders Michelsen1,4, Bjarne W Strobel5, Katrine Wulff1 and Imre Banyasz1, (1)Center For Permafrost (CENPERM), Department of Geosciences and Nature Management, University of Copenhagen, Copenhagen, Denmark, (2)University of Copenhagen, Copenhagen, Denmark, (3)Center For Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark, (4)Copenhagen University, Department of Biology, Copenhagen, Denmark, (5)Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark
Sub-arctic Wetland Greenhouse Gases (CO2, CH4 & N2O) Emissions are Driven by Interactions of Environmental Controls and Herbivore Grazers (73147)
Kathy Kelsey, University of Alaska Anchorage, Biological Sciences, Anchorage, AK, United States, A. Joshua Leffler, South Dakota State University, Natural Resource Management, Brookings, SD, United States, Karen H. Beard, Utah State University, Wildland Resources, Logan, UT, United States, Ryan T. Choi, Utah State University, Department of Wildland Resources, Logan, UT, United States, Jeffrey M Welker, University of Alaska Anchorage, Anchorage, AK, United States and YK Delta Phenology and Grazing Experiment
Earlier growing seasons and changes in migration timing influence carbon uptake and plant production in Arctic coastal wetlands (70635)
A. Joshua Leffler1, Karen H. Beard2, Kathy Kelsey3, Ryan T. Choi4, Jeffrey M Welker1 and YK Delta Phenology and Grazing Experiment, (1)University of Alaska Anchorage, Anchorage, AK, United States, (2)Utah State University, Wildland Resources, Logan, UT, United States, (3)University of Alaska Anchorage, Biological Sciences, Anchorage, AK, United States, (4)Utah State University, Department of Wildland Resources, Logan, UT, United States
Spatiotemporal Trends in late-Holocene Fire Regimes in Arctic and Boreal Alaska (85166)
Tyler J Hoecker1,2, Philip E Higuera2, Fengsheng Hu3 and Ryan Kelly4, (1)University of Idaho, Moscow, ID, United States, (2)University of Montana, Ecosystem and Conservation Sciences, Missoula, MT, United States, (3)University of Illinois, Department of Plant Biology, Urbana, IL, United States, (4)university of illinois, Urbana, IL, United States
Impact of Climate and Fires on Abrupt Permafrost Thaw in Alaskan Tundra (81943)
Melissa L Chipman1, Courtney Reents1, Jonathan A Greenberg2 and Fengsheng Hu3, (1)University of Illinois at Urbana Champaign, Urbana, IL, United States, (2)University of Illinois at Urbana Champaign, Department of Geography and Geographic Information Science, Urbana, IL, United States, (3)University of Illinois, Department of Plant Biology, Urbana, IL, United States
The long-term perspective on the carbon balance of permafrost peatlands in the Holocene: implications for modern permafrost thaw (Invited) (79912)
Miriam Jones, U.S. Geological Survey., Reston, VA, United States, Jennifer W W Harden, Stanford University, Earth System Science, Stanford, United States, Jonathan A O'Donnell, National Park Service Anchorage, Anchorage, AK, United States and Kristen Manies, US Geological Survey, Menlo Park, CA, United States
Peatland carbon cycling and the implications of permafrost thaw; a chronosequence study. (59781)
David Olefeldt, University of Alberta, Department of Renewable Resources, Edmonton, AB, Canada, Nicolas Pelletier, University of Montreal, Montreal, QC, Canada, Julie Talbot, University of Montreal, Department of Geography, Montréal, QC, Canada, Christian Blodau, University of Münster, Münster, Germany and Merritt R Turetsky, Institute of Arctic and Alpine Research, Boulder, United States
Mobilization of Aquatic Carbon from Permafrost: Tracking the Ancient Carbon Signal. (Invited) (82220)
Robert G Striegl, USGS, Hydro-Ecological Interactions Branch, Boulder, CO, United States, Michelle A Walvoord, U. S. Geological Survey, Earth System Processes Division, Denver, QC, Canada, Burke J Minsley, USGS, Geology, Geophysics, and Geochemistry Science Center, Denver, United States, Travis Drake, ETH Zurich, Tallahassee, CO, United States, George Aiken, USGS, Boulder, CO, United States and Kimberly Wickland, U.S. Geological Survey, Denver, CO, United States

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