HR: 15:25h
AN: B42B-07    [PDF]
TI: Spatial Coherence of NEE Response of Different Ecosystems to the Same Climate Anomaly
AU: * Butler, M P
EM: mpbutler@essc.psu.edu
AF: The Pennsylvania State University, Department of Meteorology 503 Walker Building, University Park, PA 16802 United States
AU: Davis, K J
EM: davis@essc.psu.edu
AF: The Pennsylvania State University, Department of Meteorology 503 Walker Building, University Park, PA 16802 United States
AU: Bakwin, P S
EM: peter.bakwin@noaa.gov
AF: NOAA/OAR Climate Monitoring and Diagnostics Laboratory, 325 Broadway, R/CMDL1, Boulder, CO 80305 United States
AU: Hollinger, D
EM: DavidH@Christa.unh.edu
AF: USDA Forest Service, 271 Mast Rd., P.O. Box 640, Durham, NH 03824 United States
AU: Wofsy, S C
EM: scw@io.harvard.edu
AF: Harvard University, Department of Earth and Planetary Science 29 Oxford St., Cambridge, MA 02138
AB: The onset of spring in 1998 was early in a large part of boreal, north central, and north eastern temperate North America. Here we compare forest ecosystem responses at several flux towers within the climate anomaly footprint. Measurements at four of these sites include both eddy covariance flux and well-calibrated carbon dioxide mixing ratio time series. The climate anomaly area is characterized by +2-4C mean temperature difference and about 50g C more uptake in spring of 1998 compared to the same period in 1997. A similar pattern of earlier uptake of carbon dioxide can be seen in the mid-day carbon dioxide mixing ratio time series. Using the global carbon dioxide mixing ratio measurement network and very simple transport assumptions, spring Northern Hemisphere carbon dioxide draw down is compared for the two years and seen to be qualitatively consistent with the local flux tower evidence. This research approaches the question of how large a land response must be, both in magnitude and area, to be detected by the global measurement network. This research also directly links the global flask network to the network of eddy-covariance flux towers. An extended network of coupled continental carbon dioxide flux and mixing ratio observations could be used to improve the accuracy of inversion-based estimates of net ecosystem exchange (NEE) of carbon dioxide.
DE: 0400 Biogeosciences
DE: 1615 Biogeochemical processes (4805)
SC: Biogeosciences [B]
MN: 2003 Fall Meeting