HR: 1340h
AN: H13C-0433    [Abstracts]
TI: All sky Predictions of Solar Irradiance, air Temperature and Humidity Using Agua and Terra MODIS and GOES-10 Satellite Data
AU: * Houborg, R M
EM: rasmic2@yahoo.com
AF: Institute of Geography, University of Copenhagen, Oester Voldgade 10, Copenhagen, 1350 Denmark
AU: Soegaard, H
EM: hs@geogr.ku.dk
AF: Institute of Geography, University of Copenhagen, Oester Voldgade 10, Copenhagen, 1350 Denmark
AB: With the new generation of earth observation satellites, opportunities for improved spatial and temporal descriptions of key environmental controls on the exchanges of carbon dioxide and energy have emerged. In this study, a satellite based scheme for the retrieval of spatially distributed input of air temperature, air humidity and solar irradiance for all sky conditions is presented using data acquired from the Agua and Terra MODerate resolution Imaging Spectroradiometer (MODIS). MODIS retrievals of atmospheric state and cloud variables are assimilated in a radiative transfer model that solves for direct-beam and diffuse solar irradiance for all sky conditions at an hourly time scale. Cloud-drift vectors from GOES-10 are implemented in order to resolve the diurnal variation in the irradiance components. Clear-sky air and dew-point temperatures are retrieved from MODIS atmospheric profiles and the predictions are extended to all sky conditions and a diurnal time scale from the use of multiple daily MODIS overpasses. The predictions are evaluated against standard meteorological data from a semi-arid grassland site in southeast Arizona for the year 2003, and the encouraging results emphasize the applicability of satellite estimates of key meteorological variables in ecosystem models for a more accurate evaluation of regional or global budgets of carbon dioxide and energy exchange.
DE: 1818 Evapotranspiration
DE: 1833 Hydroclimatology
DE: 1836 Hydrologic budget (1655)
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting