By Topic

Foam and Roughness Effects on Passive Microwave Remote Sensing of the Ocean

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Paul A. Hwang ; Naval Research Laboratory, Washington, DC, USA

Whitecaps and surface roughness are the two main components of the wind-induced microwave emissivity change of the ocean surface. The resulting difference of the received brightness temperature from that of a flat foamless sea surface at the same sea surface temperature and salinity is used for ocean surface wind vector retrieval using passive microwave remote sensing technology. In other applications such as sea surface salinity retrieval using L-band microwave radiometers, the wind-induced emissivity change is the major source of error, and its correction is important to the accuracy of retrieved salinity. Furthermore, global whitecap distribution using spaceborne radiometer measurements is possible if the contributions of emissivity change from roughness and foam can be separated. This is an important application because whitecaps are the manifestation of surface wave breaking, which is of great importance in air-sea interaction and climate research. This paper describes an analysis of the foam and roughness components of wind-induced emissivity change. The analysis is in good agreement with global WindSat measurements obtained over a broad range of wind speeds. Quantitative results on the variation of the foam and roughness components with respect to wind speed, incidence angle, microwave frequency, and polarization are presented.

Published in:

IEEE Transactions on Geoscience and Remote Sensing  (Volume:50 ,  Issue: 8 )