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Improved sea ice monitoring for the Baltic Sea – Project overview and first results

Leif E.B. Eriksson(4), Karin Borenäs(1), Wolfgang Dierking(2), Per Pemberton(1) and Henrik Lindh(3)

(1) Swedish Meteorological and Hydrological Institute, Nya Varvet 31, SE-42671 Västra Frölunda, Sweden
(2) Alfred Wegener Inst. for Polar and Marine Research, Bussestrasse 24, D-27570 Bremerhaven, Germany
(3) Swedish Meteorological and Hydrological Institute, Folkborgsvägen 1, SE-60176 Norrköping, Sweden
(4) Chalmers University of Technology, Dept. of Radio and Space Science, SE-41296 Göteborg, Sweden

Abstract

Since many years SAR data from satellites are used for operational monitoring of sea ice. In January 2007 a project started in Sweden that will assess if monitoring and forecasting capabilities can be improved by the use of SAR data from new, more advanced satellites. The main objective is to evaluate how multi-polarization SAR data from L-band (ALOS), C-band (Envisat and Radarsat-2) and X-band (TerraSAR-X and COSMO-SkyMed) can improve determination of sea ice concentration, classification of ice types and detection of ice ridges. The intention is also to investigate the possibilities to use ALOS ScanSAR data as a complement and backup for the Radarsat ScanSAR data that currently is used for operational sea ice monitoring.

Data acquisitions have been granted for three consecutive ice seasons and the first field campaign, named “Bothnia Ice Sar experiment 2007” (BothnIS-2007), took place in February to April outside the city of Umeå in northern Sweden. A number of helicopter flights were flown with cameras for the visual and thermal infrared regimes. In this way location and structure of the ice edge, new ice, melt ponds and ice ridges could be documented for large areas. These observations were complemented by weather data and measurements on the ice. Only data from ALOS PALSAR and Envisat ASAR were available in 2007, but SAR data from more satellites will be added during the next two years. The acquired SAR data are currently being analyzed and the first results will be presented at the workshop.

 

Workshop presentation

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