Heat, Salt, and Momentum Fluxes Through the Pycnocline in the Eastern Weddell Sea: Renewal

东威德尔海密斜斜层中的热、盐和动量通量：更新

• 批准号: 9615524
• 负责人: Laurence Padman
• 金额: $ 6.52万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-01 至 1998-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9615524&HistoricalAwards=false
• 关键词: Heat; Salt; Momentum; Fluxes; Through

9615524 Padman The proposed work is an extension of the data set obtained as part of an integrated research program ("Anzflux") into the oceanographic structure of upper mixed layer of the eastern Weddell Sea. It was carried out from the RVIB Nathaniel B. Palmer in the austral winter of 1994. This component of the integrated program was an effort to measure high frequency vertical profiles of velocity and temperature using a Rapid Sampling Vertical Profiler, a tethered sensor system developed by the principal investigator that free falls through the upper 250 meters of the ocean. The overall objective of this project is to study the dynamics of momentum and energy fluxes in the upper mixed layer, and to investigate the processes that determine the stability of the pycnocline. Particular emphasis is placed on the response of the pycnocline to the mesoscale velocity field, internal waves, and other coherent turbulence features. The specific goal of this extension is to model the fluxes of heat and buoyancy associated with double-diffusive convection, and the impact of tidal currents on mixing in the upper layers of the Weddell Sea. These measurements, in conjunction with other concurrent experiments to quantify the energy brought to the underside of the ice, will form the basis of a regional study of the processes responsible for the relatively thick upper mixed layer and thin ice cover. It is believed that these conditions are only marginally stable, and are maintained by a relatively high upward heat flux, which, if interrupted, could lead to deep vertical convection, and a significant change in the oceanic climate. ***

[9615524] Padman提议的工作是对作为综合研究计划（Anzflux）的一部分获得的数据集的扩展，该研究计划涉及威德尔海东部上部混合层的海洋学结构。它是在1994年南方冬天由RVIB Nathaniel B. Palmer进行的。这个综合项目的组成部分是使用快速采样垂直剖面仪（Rapid Sampling vertical Profiler）测量速度和温度的高频垂直剖面，这是一种由首席研究员开发的系绳传感器系统，可以在海洋上方250米处自由落体。该项目的总体目标是研究上层混合层的动量和能量通量动力学，并研究决定斜斜稳定性的过程。特别强调的是斜斜对中尺度速度场、内波和其他相干湍流特征的响应。本扩展的具体目标是模拟与双扩散对流相关的热通量和浮力，以及潮流对威德尔海上层混合的影响。这些测量，连同其他同时进行的实验，将量化带到冰底的能量，将构成对造成相对较厚的上层混合层和薄冰盖的过程的区域研究的基础。据信，这些条件只是略微稳定，并由相对较高的向上热通量维持，如果中断，可能导致深垂直对流，并在海洋气候中发生重大变化。＊＊＊