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/Curry在20世纪80年代末和90年代初，拉布拉多海水（LSW）的来源在北大西洋涛动的持续高阶段变得更冷，更新鲜，更密集。 这提供了一个异常的签名，可用于跟踪深水，因为它在北大西洋的深层西部边界流（DWBC）向南流动。 该项目将分析从热带大西洋及其附近的西部深海边界流的一系列部分收集的数据，其中包括最近在探索性研究小额赠款下获得的一些数据。 一个目标是确定异常LSW信号沿北大西洋西部边界沿着传播的速度。 这将提供与海洋纬向翻转环流调整相关的气候信号从高纬度传播到低纬度的估计速度。 这是许多气候变化情景中的一个重要参数，可用于测试气候模型的保真度。 第二个目的是确定这种异常低的位涡通过对DWBC的动力学影响。