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

合作研究：德雷克海峡南极绕极流的动力学和传输 (cDrake) 分析

• 批准号: 1141802
• 负责人: Kathleen Donohue
• 金额: $ 55万
• 依托单位: University of Rhode Island
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1141802&HistoricalAwards=false
• 关键词: Collaborative; Research; Dynamics; Transport; Antarctic

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.

由巨大的南极极度电流（ACC）主导的南大洋对气候变化的反应明显反应，这是由过去约30年来增加的千极风的驱动，而过去50年来全球海洋的变暖要大得多。 从地理上讲，Drake段落提供了自然的？ 用于测量ACC分量流的时间变化的时间。反过来，这为我们提供了脉搏的手段吗？南大洋循环。 CDRAKE FIELD实验是一个IPY项目，旨在解决四年内ACC的季节性变化。使用（〜40）底部的电流和压力恢复倒置回声声（CPIE）的阵列，该阵列测量底部压力，以及从表面向下的12kHz声音脉冲的行程，在5年的时间板上组装了一个速度和温度曲线的时间序列。将对CPIE和辅助水文数据集（例如CTD，ADCP和XBT）进行完整分析，以解决ACC传输可变性，将其垂直结构划分为垂直结构，而在跨drake Passage passage Passage中的ACC的许多JET和正面之间进行了横向结构之间的垂直结构，并将其横向结构划分为横向结构。