Analyzing the Tropical Impact of a Subpolar Thermohaline Anomaly

分析次极温盐异常的热带影响

• 批准号: 0095057
• 负责人: Ruth Curry
• 金额: $ 6.31万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-06-01 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0095057&HistoricalAwards=false
• 关键词: Analyzing; Tropical; Impact; Subpolar; Thermohaline

0095057/CurryIn the late 1980s and early 1990s the source of Labrador Sea Water (LSW) became colder, fresher and denser during a persistent high phase of the North Atlantic Oscillation. This provided an anomalous signature which could be used to track deep water as it flows south in the Deep Western Boundary Current (DWBC) of the North Atlantic. This project will analyze data collected from a series of sections across the deep western boundary current in and near the tropical Atlantic, including some that were recently made under a Small Grant for Exploratory Research. One aim is to determine the speed with which the anomalous LSW signal is traveling along the western boundary of the North Atlantic. This will provide an estimate of how rapidly climate signals associated with adjustments in the ocean's meridional overturning circulation can propagate from high to low latitudes. This is an important parameter in many scenarios of climate change and one that can be used to test the fidelity of climate models. A second aim is to determine the dynamical effects on the DWBC of the passage of this anomalously low potential vorticity.

0095057/咖喱在1980年代末和1990年代初期，拉布拉多海水（LSW）的来源变得更冷，更新鲜和浓密，在北大西洋振荡的持续高阶段。 这提供了一个异常的签名，该签名可用于跟踪深水，因为它在北大西洋的深层西部边界电流（DWBC）中向南流动。 该项目将分析从热带大西洋及其附近的深层西部边界电流的一系列部分收集的数据，其中包括最近根据探索性研究的小型赠款制定的数据。 一个目的是确定LSW信号沿着北大西洋的西部边界传播的速度。 这将提供一个估计气候信号与海洋子午倾覆循环中的调整相关的速度可以从高纬度传播到低纬度的。 在许多情况下，这是一个重要的参数，可以用来测试气候模型的忠诚度。 第二个目的是确定对这种异常低潜在涡度通过的DWBC的动态影响。