Joint Seminar: Improvement and verification of thin ice thickness retrieval within the Laptev Sea Polynya

Different studies indicate that the Laptev Sea as a shelf sea of the Arctic Ocean is an area of high ice formation rates. However, the results show a strong discrepancy between the ice-production rates calculated with different methods. For the calculation of an accurate ice production it is necessary to know the thin ice distribution within the polynya. We use highly resolved MODIS ice surface temperatures in combination with atmospheric data from model simulations to derive the thin ice thickness distribution within the Laptev Sea polynya. We use an established thin-ice retrieval algorithm with several modifications, as for instance a new determination of the heat transfer coefficient and 2 m wind speed. Additionally, we use NCEP reanalyses, GME analyses or COSMO simulations in comparison as atmospheric forcing data. The modified thin-ice retrieval shows improvements, especially for the heat transfer coefficient. We find that a reliable data set is necessary for the calculation of accurate thin ice thicknesses. Specifically, at thin ice thicknesses greater than 20 cm the algorithm responds sensitively to errors and biases in the atmospheric forcing data. For verification of the ice surface temperatures we use a data set measured during a field campaign in the Laptev Sea. The ice surface temperatures are highly correlated with each other (R=0.81). We also prepare an error estimation of the thin ice thickness retrieval.

Date

18.01.2011

Time

14:15 h

Place

Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg

Speaker

Susanne Adams, Universit├Ąt Trier

Organizers


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