Oceanic and Atmospheric Processes in the Formation and Maintenance of the Cosmonaut Sea Deep-Water Polynya and their Relationship to Antarctic Climate

宇航员海深水冰间湖形成和维持的海洋和大气过程及其与南极气候的关系

• 批准号: 9725320
• 负责人: Amanda Lynch
• 金额: $ 6.06万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-03-15 至 2000-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725320&HistoricalAwards=false
• 关键词: Oceanic; Atmospheric; Processes; Formation; Maintenance

*** 9725320 Lynch This project will apply a high resolution integrated numerical model that represents atmospheric, oceanic and sea ice processes to the maintenance of an antarctic coastal polynya. Polynyas are large recurrent areas of open water or reduced ice concentration within the winter sea ice cover. This project's study site is in the Cosmonaut Sea off East Antarctica, facing the Indian Ocean. It is conjectured that this polynya is maintained primarily by the upwelling of heat from the oceans rather than removal of ice by advection, and is formed as the result of a confluence of atmospheric preconditioning, deep ocean convection, modulated by local topographic interactions. Regularly occurring polynyas have importance in the antarctic climate system by influencing the surface exchange of heat, moisture, and momentum between the atmosphere and ocean, as well as affecting the chemical and biological composition of the ocean and sea ice. This project uses a combination of high resolution modeling and analysis of remotely sensed imagery, station observations, and experimental data to determine the mechanisms responsible for the formation of this polynya. The scale of the polynya requires the use of a high resolution limited area model, since global climate system models have neither the resolution nor the sophisticated parameterizations necessary to accurately model many of the important processes and feedbacks involved in polynya processes. This study can serve as a conceptual model for other antarctic deep water polynyas, such as the Weddell Sea polynya. ***

* 9725320林奇 该项目将应用一个高分辨率的综合数值模型，该模型代表大气、海洋和海冰过程，以维持南极沿海冰穴。 冰穴是冬季海冰覆盖范围内开阔水域或冰浓度减少的大片复发区域。 该项目的研究地点位于东南极洲外的宇航员海，面向印度洋。 它被证实，这个冰间湖主要是维持从海洋中的热量上涌，而不是通过平流去除冰，并形成了大气预处理，深海对流，局部地形相互作用调制的汇合的结果。 定期出现的冰穴在南极气候系统中具有重要意义，影响大气和海洋之间的热量、水分和动量的表面交换，以及影响海洋和海冰的化学和生物组成。 该项目结合使用高分辨率建模和遥感图像分析、台站观测和实验数据，以确定冰穴形成的机制。 由于全球气候系统模型既没有分辨率，也没有复杂的参数化，无法准确模拟许多重要的过程和参与冰间湖过程的反馈，因此冰间湖的规模需要使用高分辨率的有限区域模型。 这项研究可以作为一个概念模型，为其他南极深水冰穴，如威德尔海冰穴。 ***