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The dependence of nadir ocean surface emissivity on wind vector as measured with microwave radiometer

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4 Author(s)
Tran, N. ; Wallops Flight Facility, NASA Goddard Space Flight Center, Wallops Island, VA, USA ; Vandemark, D. ; Ruf, C.S. ; Chapron, B.

Global brightness temperature observations of the TOPEX/Poseidon microwave radiometer (TMR) at 18, 21, and 37 GHz have been collocated with near-simultaneous SeaWinds wind vector data as well as with monthly sea surface temperature and salinity products. The combined data allow us to study the dependence of zenith-directed ocean surface emissivity, at each frequency, upon both wind speed and direction. Results show a clear two-branch wind speed dependence; weak and linear below 7 m s-1 with an increase in sensitivity above that point. The observed emissivity also depends on the angle between the wind direction and TMR's antenna polarization orientation, providing satellite confirmation of aircraft-derived results. There is little change in these wind vector dependencies with frequency

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Geoscience and Remote Sensing, IEEE Transactions on  (Volume:40 ,  Issue: 2 )