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Climate & Radiation
Geodesy and Geophysics
Wallops Field Support
Code 614.4 Branch Brown Bag Seminar
Dr. Caroline Nicole, School of GeoSciences at the University of Edinburgh, UK
Wednesday, March 15, 2006 - 20:00
Abstract: Mapping and monitoring carbon fluxes in terrestrial environments is essential for understanding the contribution of these environments to the global carbon cycle. Present approaches to understanding ecosystem carbon exchange have been made possible through the use of eddy covariance, and models that rely on meteorological data as inputs that predict relative photosynthetic function in response to environmental conditions, including stress. A number of remote sensing products can provide estimates of GPP for biomes over composites of days. However, a significant assumption with these products is that the light use efficiency (LUE) parameter is often fixed, and modified further with functions driven by temperature and vapour pressure, which are themselves derived from coarse resolution data; producing a ìpseudoî dynamic LUE. This is the key weakness with current satellite products and a direct measurement of LUE of terrestrial vegetation using remote sensing would be particularly attractive and enable more accurate estimations of carbon uptake by vegetation: particularly when stress effects maximum LUE. Dr. Nicole's research explores the use of a suite of airborne and satellite sensors which have the potential for directly estimating vegetation LUE and stress effects: along with methods to independently validate LUE: namely through flux tower and aircraft estimates of LUE. Future developments will also be explored. Dr. Nichole is in the School of GeoSciences at the University of Edinburgh. While a grad student she spent time at Goddard in the Biospheric Sciences branch.