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Speed ambiguity in SAR hurricane wind retrievals

William Perrie(1,1), Hui Shen(2) and Yijun He(2)

(1) Bedford Institute of Oceanography, 1 Challenger Dr., Dartmouth B2Y A2, Canada
(2) Ocean Remote Sensing Laboratory, Institute of Oceanology, Qingdao 266071, China

Abstract

Under high wind conditions, backscattered signals of space-borne synthetic aperture radar (SAR) are dampened compared with the signals under moderate winds, causing a wind speed ambiguity problem in high wind retrievals from SAR, because two solutions may exist for each backscattered signal. The problem becomes more severe for measurements at low incidence angles and for the winds blowing to / against the radar direction. To remove this wind speed ambiguity, a scheme based on the dominant hurricane wind structure was developed. A hurricane image from hurricane Rita (2005) was used to evaluate the new scheme. We show that the new scheme can give significant improvements in the retrieved wind results. The wind speed ambiguity problem is even more critical for SAR-derived wind retrievals for the super intense category 5 hurricanes.

 

Workshop poster

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry