Ice-ocean-atmosphere interactions in the western Weddell Sea: Coastal polynyas, cyclones and bottom water formation

在极地海冰-海洋大气系统各组成部分之间的耦合中，沿海多年生生物起着重要的作用。开阔水域区域局部加强的表面交换过程对大气、海洋过程、冰形成(卤水释放)、气体交换和生物产生重要影响。在韦德尔海，在费尔奇纳-罗恩冰架和最近坍塌的拉森A/B冰架区域形成了经常性的沿海多尼雅冰川，这两个冰架都主要是由大气强迫引发的。该项目旨在更好地了解波利尼亚的形成过程，以及对韦德尔海地区与沿海波尼亚有关的底水形成和冰生产进行量化。将以高分辨率使用非静力天气预报模式COSMO(德国气象局，DWD)和海冰-海洋模式FESOM(AWI)的耦合系统。分辨率为5公里的模拟将在整个冬季进行。将研究天气尺度气旋和中尺度过程(如赤道风和中气旋)的强迫及其与多尼阿的相互作用。特别令人感兴趣的是前拉森冰架地区底水形成的可能变化。

Coastal polynyas play an important role for the coupling between the components of the sea ice-oceanatmosphere system in polar areas. Locally enhanced surface exchange processes in areas of open water have important consequences for the atmosphere, ocean processes, ice formation (brine release), gas exchange and biology. In the Weddell Sea, recurrent coastal polynyas form at the Filchner-Ronne ice shelf and in the area of the recently collapsed Larsen A/B ice shelves, both largely triggered by atmospheric forcing. The project aims at an improved understanding of the polynja formation processes, and the quantification of the bottom water formation and ice production associated with coastal polynyas for the Weddell Sea area. A coupled system of the non-hydrostatic weather forecast model COSMO (German Meteorological Service, DWD) and the sea ice-ocean model FESOM (AWI) will be used at a high resolution. Simulations with a resolution of 5 km will be run over a whole winter period. The forcingby synoptic-scale cyclones and mesoscale processes (such as katabatic winds and mesocyclones) and their interaction with the polynyas will be investigated. Of particular interest is the possible change of bottom water formation in the former Larsen ice shelf area.