Spatio-temporal variability of polynya dynamics and ice production in the Laptev Sea between the winters of 1979/80 and 2007/08

Polar research

Günther Heinemann¹  David Schröder²  Susanne Adams³  Sascha Willmes⁴ 

[1] Modelling, University College London Gower StreetLondon WC1E 6BT, UK;Centre for Polar Observation &Department of Environmental Meteorology, University of Trier Behringstr. 21DE-54286 Trier Germany;Department of Environmental Meteorology, University of Trier Behringstr. 21DE-54286 Trier Germany Correspondence

关键词: Polynya dynamics;    ice production;    sea-ice remote sensing;   

DOI  :  10.3402/polar.v30i0.5971

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

Polynyas in the Laptev Sea are examined with respect to recurrence and interannual wintertime ice production. We use a polynya classification method based on passive microwave satellite data to derive daily polynya area from long-term sea-ice concentrations. This provides insight into the spatial and temporal variability of open-water and thin-ice regions on the Laptev Sea Shelf. Using thermal infrared satellite data to derive an empirical thin-ice distribution within the thickness range from 0 to 20 cm, we calculate daily average surface heat loss and the resulting wintertime ice formation within the Laptev Sea polynyas between 1979 and 2008 using reanalysis data supplied by the National Centers for Environmental Prediction, USA, as atmospheric forcing. Results indicate that previous studies significantly overestimate the contribution of polynyas to the ice production in the Laptev Sea. Average wintertime ice production in polynyas amounts to approximately 55 km3±27% and is mostly determined by the polyn...

【 授权许可】

CC BY-NC