Collaborative Research: Dynamics and Transport of the Antarctic Circumpolar Current in Drake Passage (cDrake) Analysis

由巨大的南极环极流（ACC）主导的南大洋在过去~30年里不断增加的环极风的驱动下，对气候变化做出了显著的响应，并且在过去~50年里比全球海洋的变暖要明显得多。从地理上看，德雷克海峡是一个天然的咽喉要道。用于测量ACC分量流随时间变化的输运。反过来，这又为我们提供了一种测量脉搏的方法。南大洋环流cDrake野外试验是一个国际极地年项目，旨在解决4年期间大气环流的季节到年际变化。使用一组（~40）个底部系泊电流和压力记录反向回声测深仪（CPIES），测量底部压力以及12kHZ声脉冲往返地面的传播时间，在网格阵列上组装了一个时间序列的速度和温度分布，历时5年。将对CPIE和辅助水文数据集（如CTD、ADCP和XBT）进行全面分析，以解决ACC的输送变率，将其垂直结构划分为正压和斜压分量，将其横向结构划分为构成德雷克通道ACC的许多喷流和锋面。

The Southern Ocean, dominated by the huge Antarctic Circumpolar Current (ACC), is responding markedly to climate change, being driven by circumpolar winds that have increased over the past ~30 years, and warming significantly more that the global ocean over the past ~50 years. Geographically, the Drake passage provides a natural ?chokepoint? for measuring the time varying transport of the ACC component flows. In turn this provides us with a means of taking the ?pulse? of the Southern Ocean circulation. The cDrake field experiment is an IPY project to resolve seasonal to interannual variability of the ACC over a four year period. Using an array of (~40) bottom-moored Current and Pressure-recording Inverted Echo Sounders (CPIES) which measure bottom pressure along with the travel time of 12kHZ sound pulses to and from the surface, a time series of velocity and temperature profiles over a grid array has been assembled over a 5 year timespan. A full analysis of the CPIE and ancillary hydrographic data sets (e.g. CTD, ADCP and XBT) will be undertaken to resolve the ACC transport variability, partition its vertical structure between barotropic and baroclinic components, and its lateral structure partitioned between the many jets and fronts that comprise the ACC in the Drake Passage.