Sources of Discrepancies between Satellite and Land Surface Model Evaporation Estimates

Author: Alan E. Lipton, Pan Liang, John F. Galantowicz, Jean-Luc Moncet, Gennady Uymin and et al.
Date: 
January 8, 2013
Type: 
Poster presentation
Venue: 
27th Conference on Hydrology
Citation: 

Alan Lipton, P. Liang, J. F. Galantowicz, J. L. Moncet, C. Jimenez, C. Prigent, F. Aires, and G. Uymin (2012) Sources of Discrepancies between Satellite and Land Surface Model Evaporation Estimates. 27th Conference on Hydrology, Austin, TX.

Monthly-average estimates of evaporation have been derived from a combination of satellite-derived microwave emissivities, day-night differences in land surface temperature (from microwave AMSR-E), downward solar and infrared fluxes from ISCCP cloud analysis, and MODIS visible and near-infrared surface reflectances. The estimates are produced by a neural network. These evaporation estimates have been compared with data from the NOAH land surface model, as produced for GLDAS-2. Areas with persistent, substantial discrepancies between the satellite and model evaporation products have been analyzed. Sources of some discrepancies have been identified, with the aid of in-situ data from flux towers. Examples will be shown where the discrepancies are primarily related to model internal parameters and where they are related to model atmospheric input data.