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

威德尔海西部的冰-海洋-大气相互作用：沿海冰间湖、气旋和底层水的形成

基本信息

批准号：
75138509
负责人：
Professor Dr. Günther Heinemann
金额：
--
依托单位：
Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2012-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/75138509?language=en
关键词：
Ice ocean atmosphere interactions western

项目摘要

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.

在极地地区，海岸冰融区对海冰-海洋-大气系统各组分之间的耦合起着重要的作用。开放水域局部增强的表面交换过程对大气、海洋过程、冰的形成（盐水释放）、气体交换和生物产生重要影响。在威德尔海，Filchner-Ronne冰架和最近崩塌的Larsen A/B冰架区域形成了反复出现的海岸冰裂湖，两者主要是由大气强迫引起的。该项目旨在提高对冰堆形成过程的理解，并量化与威德尔海地区沿海冰堆相关的底水形成和冰生成。非流体静力天气预报模式COSMO（德国气象局，DWD）和海冰-海洋模式FESOM （AWI）的耦合系统将以高分辨率使用。模拟分辨率为5公里，将在整个冬季进行。将研究天气尺度气旋和中尺度过程（如降风和中气旋）的强迫作用及其与冰裂带的相互作用。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。