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Dmitrii Murashkin

Institution: University of Bremen
Room: NW I, room N3200
Phone: +49 421 218 - 62172
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Other webpage(s): Dmitrii's ArcTrain web page


Dmitrii Murashkin

PhD project

Remote sensing of sea ice thickness and leads using radar altimetry, microwave and optical sensors

Sea ice plays an important role in heat, momentum, and gas exchange between ocean and atmosphere and therefore is of interest for climate monitoring and forecasting. One of the most important ice properties one would want to take into account is its thickness. Retrieval of ice thickness from space was a long standing challenge. Today, the primary tool for remote sensing of sea ice thickness measurements are altimeters mounted on a satellite or aircraft.

The primary aim of the project is to improve ice thickness retrieval from the CryoSat-2 satellite (altimeter). The secondary objective is lead identification from Synthetic Aperture Radar (SAR) measurements, which are a prerequisite for the planned sea ice thickness retrieval improvement.

For sea ice the quality of the ice thickness estimation strongly depends on the accuracy of tie-points which represent the open water surfaces in between the ice floes. Therefore correct open water detection, such as lead, is essential for ice thickness retrieval from altimetry.

Sea ice lead information derived from CryoSat-2 and Sentinel-1 (SAR) will be compared. Taking into account the much higher resolution of SAR images, it is expected to find new sea surface height (SSH) tie-points for the ice thickness retrieval as well as to evaluate the quality of the existing ones obtained from CryoSat-2 alone. This, in turn, can improve CryoSat-2 ice thickness retrieval, especially at the beginning of the melting season and in the marginal ice zone (MIZ).

Both the new SAR lead dataset and the improved ice thickness data will allow further climate relevant studies, like the seasonal and interannual development of the lead distribution or to investigate the relationship between lead frequency and ice thickness especially in the MIZ, where waves additionally challenge the ice thickness retrieval.

Thesis committee

Dr. Gunnar Spreen University of Bremen
Prof. Bruno Tremblay McGill University, Montreal, Canada
Dr. Martin Losch Al­fred We­gener In­sti­tute, Helm­holtz Cen­ter for Po­lar and Mar­ine Re­search (AWI), Bremer­haven


GLOMAR Research Theme A