Impact of Laptev Sea flaw polynyas on the atmospheric boundary layer and ice production using idealized mesoscale simulations

Polar research

Günther Heinemann¹  David Schröder²  Lars Ebner³ 

[1] Centre for Polar Observation and Modelling, University College London, Gower Street, WC1E 6BT London, UK;Department of Environmental Meteorology, University of Trier, Behringstrasse 21, DE-54286 Trier, Germany;Department of Environmental Meteorology, University of Trier, Behringstrasse 21, DE-54286 Trier, GermanyCorrespondence

关键词: Mesoscale modelling;    polynyas;    sea-ice production;    Laptev Sea;   

DOI  :  10.3402/polar.v30i0.7210

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

AbstractThe interaction between polynyas and the atmospheric boundary layer is examined in the Laptev Sea using the regional, non-hydrostatic Consortium for Small-scale Modelling (COSMO) atmosphere model. A thermodynamic sea-ice model is used to consider the response of sea-ice surface temperature to idealized atmospheric forcing. The idealized regimes represent atmospheric conditions that are typical for the Laptev Sea region. Cold wintertime conditions are investigated with sea-ice–ocean temperature differences of up to 40 K. The Laptev Sea flaw polynyas strongly modify the atmospheric boundary layer. Convectively mixed layers reach heights of up to 1200 m above the polynyas with temperature anomalies of more than 5 K. Horizontal transport of heat expands to areas more than 500 km downstream of the polynyas. Strong wind regimes lead to a more shallow mixed layer with strong near-surface modifications, while weaker wind regimes show a deeper, well-mixed convective boundary layer. Shallow mesoscale circul...

【 授权许可】

CC BY-NC