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How is the angular signature of SMOS brightness temperature different in the morning and evening?

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4 Author(s)
Hornbuckle, B.K. ; Iowa State Univ. of Sci. & Technol., Ames, IA, USA ; Rowlandson, T.L. ; Patton, J.C. ; Bramer, L.M.

Evening (6pm) and morning (6am) SMOS observations are different. The greatest difference is for incidence angles less than approximately 30°, but this difference can not be explained with physical models. There is a smaller but significant difference in evening and morning SMOS observations for incidence angles greater than approximately 50°. Evening values of the polarization index are higher than morning values. This difference does have two plausible explanations: either soil moisture has decreased overnight; or vegetation water content has increased overnight.

Published in:

Geoscience and Remote Sensing Symposium (IGARSS), 2011 IEEE International

Date of Conference:

24-29 July 2011