HR: 14:30h
AN: B22C-04    [PDF]
TI: Integrating Aircraft, Tower fluxes, MODIS and Biome-BGC to Study Carbon Dioxide and Water Vapor Fluxes over Arctic Alaska
AU: * Qian, Y
EM: qian@sunstroke.sdsu.edu
AF: Global Change Research Group, Department of Biology, San Diego State University, San Diego, CA 92182 United States
AU: Oechel, W C
EM: oechel@sunstroke.sdsu.edu
AF: Global Change Research Group, Department of Biology, San Diego State University, San Diego, CA 92182 United States
AU: Zulueta, R C
EM: zulueta@mail.sdsu.edu
AF: Global Change Research Group, Department of Biology, San Diego State University, San Diego, CA 92182 United States
AU: Verfaillie, J
EM: josephv@sunstroke.sdsu.edu
AF: Global Change Research Group, Department of Biology, San Diego State University, San Diego, CA 92182 United States
AU: Kwon, H
EM: hkwon@sciences.sdsu.edu
AF: Global Change Research Group, Department of Biology, San Diego State University, San Diego, CA 92182 United States
AU: Heinsch, F
EM: faithann@ntsg.umt.edu
AF: Numerical Terradynamic Simulation Group, School of Forestry, The University of Montana, Missoula, MT 59812 United States
AU: Kimball, J
EM: johnk@ntsg.umt.edu
AF: Numerical Terradynamic Simulation Group, School of Forestry, The University of Montana, Missoula, MT 59812 United States
AB: To understand carbon and water dynamics of susceptible Arctic Tundra ecosystem, intensive and integrated methods are implemented on the North Slope of Artic Alaska, including eddy covariance, remote sensing and ecosystem models. Tower-based eddy covariance instruments have strongly ability to measure long-term temporal trend, and aircraft-based flux measurements is able to assess spatial variations efficiently. Both of complemental measurements have been used on this region for several years. The Aircraft (Sky Arrow ERA 650) with eddy covariance and remote sensors flied at 100 km scale over 115 hours in 2001. The aircraft fluxes are compared to tower fluxes at Barrow, Atqasuk and potable tower. The correlation of aircraft fluxes and MODIS NDVI, EVI and LAI are addressed. MODIS GPP, PSN, NPP are validated by tower measurement at long-term temporal scale and by aircraft measurement at larger spatial scale. The process-based ecosystem model, Biome-BGC, is run at five sites: Barrow, Atqasuk, Ivotuk, Toolik Lake, Prudhoe Bay. While the model can computer components of CO2 flux that cannot be directly monitored, the comparisons of model outputs and aircraft, tower measurements are used to help improve the model estimate ability. The intercomparison of model and MODIS is also discussed in this paper. Key words: Arctic tundra, trace-gas flux, aircraft-based, eddy covariance, MODIS, Biome-BGC
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0315 Biosphere/atmosphere interactions
DE: 0933 Remote sensing
DE: 1800 HYDROLOGY
SC: Biogeosciences [B]
MN: 2003 Fall Meeting