The Antarctic Coastal Current and its Influence on the Formation of Bottom Water in the Weddell Sea

模式结果表明，南极海岸流（AACC）在长时间尺度上影响威德尔海的深水和底水特性。该项目的目的是确定AACC的电流、温度和盐度的平均场及其变异性。将确定这些变化的原因及其对威德尔海深水和底水的性质和形成的影响。为了达到这个目的，我们评估了RV北极星号过去航行和在本项目框架下进行的航行的可用数据，以描述当前的时间和区域变化。根据AACC中停泊在格林尼治子午线上的仪器和重复的CTD（电导率、温度、深度）剖面的数据，研究了时间变化。空间变异性由格林尼治子午线的CTD剖面、声学多普勒电流剖面仪（ADCP）、浮子和冰山标记数据来解决。将特别强调与亚太地区海冰和冰山漂移有关的淡水运输。调查应表明观察到的底水性质的变化在多大程度上与ACCC的变化有关，以及它们是来自东部平流的结果还是源自威德尔海。

Model results indicate that the Antarctic Coastal Current (AACC) influences the properties of the deep and bottom water properties in the Weddell Sea on long time scales. The aim of this project is to determine the mean fields of current, temperature and salinity of the AACC and their variability. The causes of the variations and their influence on the properties and formation of deep and bottom water in the Weddell Sea will be determined. For this purpose, available data from past cruises with RV Polarstern and those carried out under the framework of the present project are evaluated to describe the temporal and regional variations of the current. The temporal variations are studied on the basis of data from instruments moored on the Greenwich Meridian in the AACC and repeated CTD (conductivity, temperature, depth) sections. The spatial variability is addressed by CTD sections on the Greenwich Meridian, Acoustic Doppler Current Profiler (ADCP), floats and iceberg marker data. Special emphasis will be given to the freshwater transport related to sea ice and icebergs drifting in the AACC. The investigation should show to what extent the observed variations in the bottom water properties can be related to variations of the ACCC and if they are the results of advection from the east or originate within the Weddell Sea.