This work was funded by the NASA Earth Sciences Climate and Radiation Research and Analysis Program under R. Curran through JPL Subcontract 960916/97 as part of a research project into influences upon top-of-atmosphere radiative fluxes. We gratefully acknowledge the Principal Investigator of this project, Ralph Kahn. Additional funding was provided by NASA under NAS5-31369 as part of the Terra-MODIS project. Wolfgang Lucht was partially funded by the German Federal Ministry of Education and Research under project 01LA98280. We thank Alan Strahler for continued support at Boston University. We also thank two anonymous references for their helpful comments.
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