HR: 1340h
AN: B23A-0925    [Abstracts]
TI: A tall-tower study of carbon exchange from developed land use in the U.S. Upper Midwest
AU: * McFadden, J P
EM: mcfadden@umn.edu
AF: Department of Ecology, Evolution, and Behavior, University of Minnesota, 1987 Upper Buford Cir, Saint Paul, MN 55108 United States
AU: Widboom, A A
AF: Department of Ecology, Evolution, and Behavior, University of Minnesota, 1987 Upper Buford Cir, Saint Paul, MN 55108 United States
AU: Bauer, M E
AF: Department of Forest Resources, University of Minnesota, 1530 Cleveland Ave N, Saint Paul, MN 55108 United States
AU: Yuan, F
AF: Department of Forest Resources, University of Minnesota, 1530 Cleveland Ave N, Saint Paul, MN 55108 United States
AB: A central goal of the North American Carbon Program is to reconcile differences in regional carbon exchange predictions from atmospheric and ground-based approaches. Within any large region there are embedded areas where land cover and land use have been strongly modified by development. However, studies involving continuous measurement of CO$_{2}$ exchange in developed land have begun only recently. These areas represent a significant percentage of the Upper Midwest region. U.S. Census housing density data show that while high-density urban areas occupy 3% of the land area, low-density residential land uses (generally suburbs) occupy $>$11% of the land area. We established a new tall-tower site to study CO$_{2}$, water vapor, and energy exchange from developed land use in the in the Minneapolis-Saint Paul metropolitan area. The objectives of the study are: 1. To quantify the components of the net ecosystem exchange of CO$_{2}$ (NEE) of developed land use and their variation over diurnal, synoptic, seasonal, and interannual time scales. 2. To determine the specific ecosystem controls on the net exchanges of CO$_{2}$, water vapor, and energy by analyzing the relationships between the fluxes and a suite of biophysical properties measured within the footprint of the flux tower. 3. To evaluate the relationship of the MODIS vegetation index, land surface temperature, and snow cover products to temporal dynamics of net ecosystem exchange of CO$_{2}$ and water vapor at a range scales from the flux tower to the metropolitan area. The design, implementation, and first results of the site will be presented. The long-term goal of this research is to understand how developed land use affects regional- to continental-scale carbon dynamics, how these effects may change with urban growth and development, and ultimately, how they could be managed to mitigate carbon sources and maximize sinks.
DE: 1615 Biogeochemical processes (4805)
DE: 1640 Remote sensing
DE: 0315 Biosphere/atmosphere interactions
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting