Impacts of Gulf Stream Warm-Core Rings on Gulf of Maine Circulation

湾流暖核环对缅因湾环流的影响

• 批准号: 1634965
• 负责人: Weifeng Zhang
• 金额: $ 49.59万
• 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: 2017
• 资助国家: 美国
• 起止时间: 2017-01-01 至 2021-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1634965&HistoricalAwards=false
• 关键词: Impacts; Gulf; Stream; Warm; Core

The Gulf of Maine is a marginal sea of critical ecological and economical importance. Influenced by both local and remote forcing, the Gulf of Maine physical and ecological system is currently experiencing rapid changes. The gulf undergoes significant water exchanges with the slope sea and the Scotian Shelf of distinct water masses. The slope waters are often found in the deep basins in the gulf and display a wide range of variability. Through modifying density distribution in the basins, the intruding slope waters can potentially alter the near-shore circulation and affect the along-shelf transport of marine species. Studying the water exchange between the Gulf of Maine and the slope sea is thus crucial for understanding the varying physical and ecological environment in the gulf, including the dynamics of reoccurring harmful algal blooms. This study aims to address the fundamental dynamics and regional influences of the interaction between the Gulf of Maine and Slope Sea on shorter time scales associated with Gulf Stream warm core rings. The outcome of this project will benefit coastal fisheries and public health and the work involves participation of high school and undergraduate students.Warm core rings are major events in the continental slope region. They interact with the unique topography at the Northeast Channel and affect the flow within the channel. Three possible modes of interactions between warm core rings and the Gulf of Maine are proposed: 1) A warm core ring drives outflow in the Northeast Channel as part of the offshore flowing streamer on the northeast side of the ring; 2) onshore motion of a ring limb causes intrusion of slope/ring waters into the channel; 3) a warm core ring pushes the shelf-slope front shoreward and enhances the generation of oscillatory exchange flows in the channel by along-shelf propagating frontal meanders. The study is based on two general hypotheses: 1) warm core rings activities in the adjacent slope sea induce strong flows in the Northeast Channel, resulting in significant heat and salt exchange between the Gulf of Maine and the slope sea; and 2) the warm core ring-induced inflow in the channel brings in dense slope waters and modulates the characteristics of the deep water masses and the coastal circulation in the Gulf of Maine. These hypotheses will be tested through the analysis of available in situ observations, satellite measurements, process-oriented idealized model simulations, and realistic regional model hindcast simulations.

缅因州湾是一个边缘海，具有重要的生态和经济意义。受本地和远程强迫的影响，缅因州海湾的物理和生态系统目前正在经历迅速的变化。海湾经历了显着的水交换与斜坡海和斯科舍大陆架的不同水团。斜坡沃茨通常出现在海湾的深盆地中，并显示出广泛的变化。斜坡沃茨的入侵可能通过改变盆地的密度分布，改变近岸环流，影响海洋物种沿陆架的迁移。因此，研究缅因州湾和斜坡海之间的水交换是至关重要的，了解海湾的物理和生态环境的变化，包括有害藻华的动态。本研究旨在解决的基本动力学和区域影响之间的相互作用缅因州和斜坡海在较短的时间尺度上与墨西哥湾流暖芯环。这一项目的成果将有益于沿海渔业和公共卫生，这项工作涉及高中生和大学生的参与。它们与东北航道独特的地形相互作用，影响航道内的水流。提出了暖核环与缅因州湾相互作用的三种可能模式：1）暖核环作为环东北侧海上流动拖缆的一部分，驱动东北海峡的外流; 2）环翼向岸运动导致斜坡/环沃茨侵入海峡;（3）暖核环推动陆坡前缘向岸移动，并通过沿陆坡传播的锋面弯曲，促进了槽道振荡交换流的产生。研究基于两个基本假设：1）邻近陆坡海的暖芯环活动在东北海峡引起强烈的气流，导致缅因州湾与陆坡海之间发生显著的热盐交换; 2）暖芯环-水道中的诱导入流带来密集的斜坡沃茨，并调节了墨西哥湾深水区和沿岸环流的特征。缅因州。将通过分析现有的现场观测、卫星测量、面向过程的理想化模型模拟和现实的区域模型后报模拟来检验这些假设。

项目成果

Variability of Deep Water in Jordan Basin of the Gulf of Maine: Influence of Gulf Stream Warm Core Rings and the Nova Scotia Current

缅因湾约旦盆地深水变化：湾流暖核环和新斯科舍洋流的影响

• DOI: 10.1029/2020jc017136
• 发表时间: 2021
• 期刊: Journal of Geophysical Research: Oceans
• 作者: Du, Jiabi;Zhang, Weifeng G.;Li, Yizhen
• 通讯作者: Li, Yizhen

Frontal Subduction of the Mid-Atlantic Bight Shelf Water at the Onshore Edge of a Warm-Core Ring

暖核环陆上边缘大西洋中部湾陆架水的锋面俯冲

• DOI: 10.1029/2018jc013794
• 发表时间: 2018
• 期刊: Journal of Geophysical Research: Oceans
• 作者: Zhang, Weifeng G.;Partida, Jacob
• 通讯作者: Partida, Jacob

The Changing Nature of Shelf-Break Exchange Revealed by the OOI Pioneer Array

• DOI: 10.5670/oceanog.2018.110
• 发表时间: 2018-03-01
• 期刊: OCEANOGRAPHY
• 影响因子: 2.8
• 作者: Gawarkiewicz, Glen;Todd, Robert E.;Dent, Margaret
• 通讯作者: Dent, Margaret