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ASAR imaging for coastal upwelling in the Baltic Sea |
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| Authors: | Igor E Kozlov Vladimir N Kudryavtsev Johnny A Johannessen Bertrand Chapron Inga Dailidien? Alexander G Myasoedov |
| Institution: | 1. Russian State Hydrometeorological University, 98, Malookhtinsky prospect, 195196 St. Petersburg, Russian Federation;2. Nansen International Environmental and Remote Sensing Centre, 7, 14th line, 199034 St. Petersburg, Russian Federation;3. Nansen Environmental and Remote Sensing Centre, Thormøhlensgate 47, N-5006 Bergen, Norway;4. Geophysical Institute, University of Bergen, Allégaten 70, N-5000 Bergen, Norway;5. Institute Francais de Recherche pour I’Exploitation de la Mer, BP 70, 29280 Plouzane, France;6. Department of Geophysical Sciences, Klaip?da University, H. Manto g. 84, LT-92291 Klaip?da, Lithuania |
| Abstract: | 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. |
| Keywords: | Coastal upwelling SAR imaging MABL transformation over temperature front Surface slicks The Baltic Sea |
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