Monday, August 3, 2009: 1:30 PM-5:00 PM
San Miguel, Albuquerque Convention Center
Organizer:
Paul C. Stoy, Montana State University
Co-organizer:
Edward B. Rastetter, Marine Biological Lab
Moderator:
Gaius Shaver, Marine Biological Laboratory
The session will describe both measurements and models of polar biogeochemistry and hydrology, as well as the combination of measurements and models using data assimilation. Projects funded under the auspices of the International Polar Year (IPY) are particularly encouraged. Speakers will be expected to discuss the ecological aspects of their findings, and to emphasize the importance of the polar ecological experience to ESA members. The observation-based studies will be presented first to motivate the modeling and data assimilation talks.
The session will begin with a discussion of long-term trace gas flux observations from Walt Oechel. Jeffrey Welker will then discuss recent measurements of biogeochemical cycling in northern and western Greenland, and Donatella Zona will show new results from large-scale ecosystem manipulations from the recent 1-ha drying experiments near Barrow. An international team from the laboratory of Brian Sorrell of the National Institute of Water and Atmospheric Research in New Zealand will describe new findings on ecosystem metabolism during the transient snowmelt season in meltwater ponds in Antarctica. This experimental work will lead to an analysis of measurement uncertainty and implications for future C flux estimates by Howard Epstein, which will motivate the modeling and data assimilation studies which will follow after the break.
Ed Rastetter will introduce the use of the Ensemble Kalman Filter for data assimilation, using the example of assimilating pan-arctic eddy covariance measurements into simple ecosystem models (During his talk, Gus Shaver would like to briefly describe the impacts of a recent fire in the North Slope of Alaska.) Paul Stoy will then describe the use of data assimilation and information theory to constrain C flux estimates at scales from leaf to region using data from the ABACUS project in northern Fennoscandia. The modeling studies will be synthesized with Dave McGuire’ss retrospective analysis of the Arctic Carbon Cycle Assessment including large-scale modeling results over the past decade. Two additional talks will be chosen by the conference organizers.
1:30 PM
Long-term observations of trace gas fluxes in the Arctic
Walter C. Oechel, San Diego State University;
Steven J. Hastings, Polar Field Services, Inc.;
Hiroki Ikawa, San Diego State University;
Hyojung Kwon, Oregon State University;
Cheryl Laskowski, San Diego State University;
Joseph Verfaille Jr., University of California, Berkeley;
Donatella Zona, University of California, Davis;
Rommel Zulueta, National Ecological Observatory Network (NEON, Inc.)
2:10 PM
The consequence of the change in hydrology on CO2 fluxes in the Arctic tundra: Results from the first large-scale water table manipulation experiment in the Alaskan Arctic tundra
D. Zona, San Diego State University;
Walter C. Oechel, San Diego State University;
Steven F. Oberbauer, Florida International University;
Paulo C. Olivas, Florida International University;
CE Tweedie, University of Texas at El Paso;
Larry Hinzman, University of Alaska, Fairbanks,;
Anna Liljedahl, University of Alaska, Fairbanks,;
David A. Lipson, San Diego State University
3:20 PM
Assimilating arctic C flux data into an ecosystem model using the Ensemble Kalman Filter
Edward B. Rastetter, Marine Biological Lab;
M. Williams, University of Edinburgh;
Kevin L. Griffin, Columbia University;
B. Kwiatkowski, Marine Biological Lab;
G. Tomasky, Marine Biological Lab;
M. Potosnak, DePaul University;
Paul C. Stoy, Montana State University;
Gaius Shaver, Marine Biological Laboratory;
M. Stieglitz, Georgia Institute of Technology;
G. Kling, University of Michigan;
John E. Hobbie, Marine Biological Laboratory
3:40 PM
Assimilating multi-scale observations into ecological models to reduce the uncertainty of carbon flux estimates in northern Fennoscandia
Paul C. Stoy, Montana State University;
M. Williams, University of Edinburgh;
T. Hill, University of Edinburgh;
J. Evans, Centre for Ecology and Hydrology;
B. Fletcher, University of Sheffield;
J. Gornall, Met Office;
I. Hartley, University of Stirling;
P. Ineson, York University;
V. Sloan, University of Sheffield;
R. Poyatos, Durham University;
A. Prieto-Blanco, UCL;
L. Street, University of Edinburgh;
T. Wade, University of Edinburgh;
J. Moncrieff, University of Edinburgh;
J. Subke, University of York
