NDLI: ERS-1 scatterometer measurements. I. The relationship between radar cross section and buoy wind in two oceanic regions

Content Provider	IEEE Xplore Digital Library
Author	Rufencach, C.L. Bates, J.J. Tosini, S.
Copyright Year	1980
Abstract	Extensive European Remote Sensing Satellite (ERS-1) spacecraft scatterometer measurements were collocated within /spl plusmn/25 km of buoy measurements at midlatitudes and in the equatorial Pacific during 1992-1994. Two different directional functional forms for the geophysical model were fit to these measurements described by cross section maxima aligned and offset, with respect to the mean wind direction. The two models exhibit fits with similar residuals for each of three years in the equatorial region. Thus, neither of these two model functions can convincingly be identified as more accurate than the other unless additional factors are considered. Nevertheless, the offset model results in an average directional offset near 10/spl deg/ for each season during the three-year period; whereas, no such offset was inferred at midlatitudes. The cross section dependence on wind direction also exhibits another unexpected average property: a larger downwind compared to upwind cross section, A/sub 10//spl ap/-0.25 dB in the equatorial Pacific. This characteristic could be caused by a concentration of the short Bragg waves on the backside of the long wave crests. Both of these unexpected characteristics are likely related to a dominant systematic swell traveling nearly perpendicular to the prevailing easterly winds across the equatorial Pacific Ocean. The possible cross section dependence on wind stress and wind speed is due to long waves when adjusting the buoy measurements to a common height are discussed.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	603
Ending Page	622
Page Count	20
File Size	509167
File Format	PDF
ISSN	01962892
Volume Number	36
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radar measurements Geophysical measurements Sea measurements Spaceborne radar Radar cross section Radar remote sensing Remote sensing Satellites Space vehicles Oceans
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

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