Mesoscale Circulation, Tides and Mixing on the Western Antarctic Peninsula Shelf: A Component of WINDSSOCK (ESR proposal #99-48)

该项目通过发展南极冬季冰雪覆盖的演变、生物栖息地的可变性和海洋生态过程的季节性进程之间的关系，为协调努力了解生物和物理动力学的相互作用作出了贡献。这项工作将在全球海洋生态系统动力学研究(GLOBEC)南大洋实验的背景下进行，GLOBEC是一项关于南极半岛西侧玛格丽特湾附近南极海冰下磷虾冬季生存策略的大型多调查者研究。该项目涉及几个方面：一是声学多普勒海流剖面仪(ADCP)和电导率-温度-深度(CTD)数据的收集、分析和存档，以表征中尺度环流特征和区域水文。另一个是开发一个准确的、经过充分验证的玛格丽特湾潮流模型。第三个是提供一个小尺度过程的数据集，如切变不稳定、潮汐搅拌、中尺度涡旋和双重扩散，这些过程是有效地参数化热量、盐和营养物质的垂直扩散系数所必需的。该项目的结果将提供一个统一的数据集，满足协调的化学和生物研究的数据要求，将水柱和海冰过程与磷虾及其捕食者的生物学联系起来。这些结果将进一步有助于将这些冬季观测与夏季和南极周围其他地区在GLOBEC计划的国际背景下进行的类似观测联系起来。总的目标是开发一个全面的生态系统模型，以检验我们对该系统的理解，确定其敏感性，并为综合南大洋全球观测提供一个组织机制。***

This project is a contribution to a coordinated attempt to understand the interactions of biological and physical dynamics by developing relationships among the evolution of the antarctic winter ice and snow cover, biological habitat variability, and the seasonal progression of marine ecological processes. The work will be carried out in the context of the Southern Ocean Experiment of the Global Ocean Ecosystem Dynamics Study (Globec), a large, multi-investigator study of the winter survival strategy of krill under the antarctic sea ice in the vicinity of Marguerite Bay on the western side of the Antarctic Peninsula.There are several aspects to this project: One is the collection, analysis, and archiving of Acoustic Doppler Current Profiler (ADCP), and Conductivity-Temperature-Depth (CTD) data in order to characterize mesoscale circulation features and the regional hydrography. Another is to develop an accurate and fully validated model of tidal currents in Marguerite Bay. A third is to provide a data set of small-scale processes such as shear instabilities, tidal stirring, mesoscale eddies, and double diffusion, that are required for the effective parameterization of the vertical diffusivities of heat, salt, and nutrients. The results of this project will provide a unified data set that satisfies the data requirement of the coordinated chemical and biological studies which will link water column and sea ice processes with the biology of krill and its predators. The results further will help to link these winter observations to similar observations made in summer and elsewhere around Antarctic in the international context of the Globec program. The overall objective is to develop a comprehensive ecosystem model that will test our understanding of the system, determine its sensitivities, and to provide an organizing mechanism for integrating the Southern Ocean Globec observations. ***