ANZFLUX (Antarctic Zone Flux Experiment) CTD/Tracer Program

9317231 Martinson拟议的工作是一个综合研究计划（“Anzflux”）的一部分，该计划旨在研究威德尔海东部上混合层的海洋学结构。 从RVI B Nathaniel B进行。帕尔默在1994年的冬天。 这里提出的工作涉及收集水文和地球化学示踪数据，以确定各种空间尺度上的三维海洋结构，并为验证海洋模型提供数据。 威德尔海东部是一个温暖的地区，由温度接近+1摄氏度的温暖的绕极深水的入侵所定义，而寒冷的地区并存。 寒冷的情况发生在西部，那里的深水被一层厚厚的接近冰点的混合层覆盖。然而，在这两个地区，季节性地将足够的热量带到海冰上，使其完全融化。 该项目的目标是允许重建威德尔环流的整体结构，温暖和寒冷的制度，并确定大规模的斜压性，上升流，和通风的中间水团。 在较小的规模上，这项工作将描述两个漂移站之间的具体差异，并为模拟海洋过程提供初始条件。 示踪剂测量将补充直接观测，并将限制估计的净转移到表层的温暖深水。 这些测量，连同其他同时进行的量化冰底能量的实验，将成为对造成相对较厚的上混合层和薄冰盖的过程进行区域研究的基础。 据信，这些条件只是勉强稳定，并由相对较高的向上热通量维持，如果中断，可能导致深层垂直对流和海洋气候的重大变化。 ***

9317231 Martinson The proposed work is part of an integrated research program ("Anzflux") into the oceanographic structure of upper mixed layer of the eastern Weddell Sea. It is to be carried out from the RVIB Nathaniel B. Palmer in the austral winter of 1994. The work proposed here concerns the collecting of hydrographic and geochemical tracer data to determine the three-dimensional oceanic structure on various spatial scales and to provide data for the validation of oceanic models. The eastern Weddell Sea is a region where a warm regime, defined by the intrusion of warm circumpolar deep water with temperatures near +1 deg C, and a cold regime exist side by side. The cold regime occurs to the west, where deep water is overlain by a thick near- freezing mixed layer. In both regions however enough heat is seasonally carried to the sea ice to melt it completely. The objectives of this project are to allow the reconstruction of the overall configuration of the Weddell Gyre, the warm and cold regimes, and to determine the large-scale baroclinicity, upwelling, and ventilation of intermediate water masses. On a smaller scale this work will characterize the specific differences between the two drift stations and provide initial conditions for modeling the oceanic processes. The tracer measurements will complement the direct observations, and will constrain estimates of the net transfer of warm deep water into the surface layer. These measurements, in conjunction with the 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. ***