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Progress in utilizing altimeter ocean backscatter measurements for sea surface roughness applications

Douglas Vandemark(1) , Tanos Elfouhaily(2) , Bertrand Chapron(3) , and Ngan Tran(4)

(1) University of New Hampshire, Morse Halll, Rm 142, Durham NH 03801, United States
(2) University of Miami, 4600 Rickenbacker Causeway, Miami FL, United States
(3) IFREMER/Centre de Brest, BP 70, Plouzane 29280, France
(4) CLS, 810 rue Hermes, 31526 Ramonville St. Agnes, France

Abstract

One of the cornerstone's of ocean remote sensing is the ability to detect changes in ocean surface waves related to different environmental conditions. The satellite altimeter continues to build a long-term global record of this ocean surface roughness variability from the unique vantage point of a radar whose angle of incidence is directly at nadir, a view that is most sensitive to the sea surface slope statistical distribution. Moreover, the TOPEX/Poseidon, Jason-1, and Envisat missions each carry dual-frequency radar altimeters that have added a new wave remote sensing perspective. This paper will provide a review of the progress made in interpretation and application of altimetry's ocean radar cross section measurements in the last decades. These applications include wind speed and stress estimation, air-sea carbon dioxide gas transfer, ocean slick detection, wave-current interaction measurements near strong boundary currents, direct impact on altimeter sea level estimates through the sea state bias correction, high resolution wind sampling within storms, and retrieval of surface wave properties spanning from cm to m scale wavelengths. Much of the recent progress has come from synergistic studies where collocated scatterometer, wind and wave model, and in situ data are blended to gain a more comprehensive definition of the role that sea surface waves play within the context of the applications above. Attention will be given to climate data record potential for the altimeter cross section measurements as well as the absolute and relative calibration of these data within and across satellite platforms.

 

Workshop presentation

 

                 Last modified: 07.10.03