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.

以巨大的南极绕极流 (ACC) 为主导的南大洋，在过去约 30 年里增加的绕极地风的驱动下，对气候变化做出了显着的反应，并且其变暖程度明显超过了过去约 50 年全球海洋的变暖程度。年。 从地理上来说，德雷克海峡提供了一个天然的“咽喉要道”。 用于测量 ACC 分量流的随时间变化的传输。反过来，这为我们提供了一种把握“脉搏”的方法。南大洋环流。 cDrake 现场实验是一个 IPY 项目，旨在解决四年期间 ACC 的季节到年际变化问题。使用一系列 (~40) 底部系泊电流和压力记录倒置回声测深仪 (CPIES) 测量底部压力以及 12kHZ 声音脉冲往返于表面的传播时间、速度和温度剖面的时间序列网格阵列的组装历时五年。将对 CPIE 和辅助水文数据集（例如 CTD、ADCP 和 XBT）进行全面分析，以解决 ACC 输送变异性，在正压和斜压分量之间划分其垂直结构，以及在许多急流和锋面之间划分其横向结构包括德雷克海峡的 ACC。