ASAR imaging for coastal upwelling in the Baltic Sea

作者：Kozlov Igor E^*; Kudryavtsev Vladimir N; Johannessen Johnny A; Chapron Bertrand; Dailidiene Inga; Myasoedov Alexander G

来源：Advances in Space Research, 2012, 50(8): 1125-1137.

DOI：10.1016/j.asr.2011.08.017

• Coastal upwelling
• SAR imaging
• MABL transformation over temperature front
• Surface slicks
• The Baltic Sea

Analysis of Envisat Advanced Synthetic Aperture Radar (ASAR) and Aqua/Terra Moderate Imaging Spectrometer (MODIS) infrared (IR) imagery of coastal upwelling in the southeastern Baltic Sea is presented. It is found that upwelling features are well distinct in the SAR images, and the leading imaging mechanism appears to be the change of the marine atmospheric boundary layer (MABL) stratification over the sea surface temperature (SST) front. This finding is supported by model calculations of the MABL transformation supplemented with the SAR backscatter calculations based on the CMOD4 model. In addition an empirical dependence of the SAR contrasts over the upwelling region on the wind speed and the SST drop is suggested. Finally, surface slicks accumulated in the sea surface current convergence zones generate additional distinct features in SAR imagery. This effect is interpreted within the framework of the coastal current circulation model based on analysis of the SST snapshot.

• 出版日期2012-10-15