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

9615524帕德曼拟议的工作是作为一项综合研究方案(“ANZFlux”)的一部分而获得的数据集的延伸，该数据集已进入东部韦德尔海上层混合层的海洋结构。它是在1994年南冬从RVIB纳撒尼尔·B·帕尔默进行的。综合计划的这一组成部分是使用快速采样垂直剖面仪测量高频垂直速度和温度剖面的努力，这是一种由首席调查员开发的绳系传感器系统，可以自由降落到海洋的250米以上。该项目的总体目标是研究上层混合层中动量和能量通量的动力学，并研究决定跃层稳定性的过程。特别强调了跃层对中尺度速度场、内波和其他相干湍流特征的响应。这一扩展的具体目标是模拟与双扩散对流有关的热通量和浮力通量，以及潮流对韦德尔海上层混合的影响。这些测量，连同其他同时进行的量化冰下能量的实验，将构成对造成相对较厚的上层混合层和较薄的冰盖的过程进行地区性研究的基础。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，可能会导致深度垂直对流和海洋气候的显著变化。***

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. ***