The Agulhas Undercurrent Experiment

厄加勒斯暗流实验

• 批准号: 0244769
• 负责人: Lisa Beal
• 金额: --
• 依托单位: University of Miami
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-12-01 至 2007-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0244769&HistoricalAwards=false
• 关键词: Agulhas; Undercurrent; Experiment

0244769BealRecent observations of a strong, apparently persistent, Agulhas Undercurrent (AUC) raise a multitude of provocative questions. The big questions addressed by this study are What are the latitudinal extent of the AUC and its role in the thermohaline circulation?What are the evolution and forcing of the velocity, potential vorticity, and water mass structure along the AUC path?How does one quantify the mixing/entrainment with western boundary current waters and determine the absolute fluxes of heat and mass within the AUC?What are the mean and temporal variability of the transport of the AUC?A hydrographic cruise is proposed during which 4 conductivity-temperature-depth and lowered acoustic Doppler current profiler sections of the AUC will be measured. A short mooring array along 32S will be deployed, as well. Three moorings will each contain 3 meters spaced to capture the AUC transport. They will be confined to the lower 1000 m of the water column and be designed to monitor for up to 2 years, but may be retrieved earlier. The dominant fluctuations are expected to have periods of 30 - 40 days. The moorings, meters, and associated technicians will be provided at no cost to NSF by Southampton Oceanography Centre. A line of stations at 50 km spacing will connect the offshore ends of the sections closing boxes to allow property balance estimation to be done. A line of stations at 100 km spacing will be made along 1800 m from 26S to 37S to estimate the latitudinal extent of the undercurrent. Each station will include conductivity-temperature-depth, dissolved oxygen, and lowered acoustic Doppler current profiler data with 24 bottles for calibration to WOCE standards by ODF personnel. The cruise should require about 28 days.

0244769Beal 最近对强烈的、明显持续的厄加勒斯暗流 (AUC) 的观察提出了许多挑衅性的问题。 这项研究解决的主要问题是 AUC 的纬度范围及其在温盐环流中的作用是什么？沿 AUC 路径的速度、位涡和水团结构的演变和强迫是什么？如何量化与西边界水流的混合/夹带，并确定 AUC 内热和质量的绝对通量？AUC 传输的平均和时间变化是多少？建议进行水文巡航，在此期间 4将测量 AUC 的电导率-温度深度和降低的声学多普勒电流剖面仪部分。 沿 32S 还将部署一个短系泊阵列。 三个系泊点的间距为 3 米，用于捕获 AUC 运输。 它们将被限制在水体下部 1000 米处，设计监测时间长达 2 年，但可能会提前回收。 主要波动预计持续 30 - 40 天。 南安普顿海洋学中心将免费向 NSF 提供系泊装置、仪表和相关技术人员。 间隔 50 公里的一排车站将连接各部分封闭箱的近海端，以便进行财产平衡估算。 从南纬 26 度到南纬 37 度，沿 1800 m 布设一排间隔 100 公里的测站，以估计暗流的纬度范围。 每个站将包括电导率-温度深度、溶解氧和降低声学多普勒电流剖面仪数据，并配有 24 个瓶子，供 ODF 人员根据 WOCE 标准进行校准。 游轮大约需要28天。