Synthetic aperture radar as a tool for investigating polar mesoscale cyclones

Polar mesoscale cyclones are intense vortices that form in cold, marine air masses poleward of major jet streams and frontal zones. Synthetic aperture radar (SAR) should be considered as a potential tool for the study of pola r mesoscale cyclones because of its ability to remotely sense, at least qua litatively, the high- resolution near- surface wind field independent of da ylight and atmospheric conditions. Four case studies demonstrating this abi lity are presented. SAR imagery from the Canadian Space Agency's RADARSAT a re compared to corresponding infrared imagery, surface analyses, and upper- air analyses. In three of the four case studies, it is argued that the add ition of SAR imagery to the process of generating a manual surface analysis would have led to a better product. Moreover, it is demonstrated that the SAR imagery reveals a host of marine- meteorological phenomena in the vicin ity of the polar mesoscale cyclones including atmospheric gravity waves, ro ll vortices, and cellular convection. Because of the high- resolution attri butes of SAR imagery, SAR shows promise to aid the forecaster and researche r in the study of marine- meteorological phenomena such as polar mesoscale cyclones.