Warm Water Entry and Transformation Within the Subpolar North Atlantic

北大西洋副极地的暖水进入和转化

• 批准号: 9529606
• 负责人: Michael McCartney
• 金额: $ 105.5万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-10-15 至 2001-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9529606&HistoricalAwards=false
• 关键词: Warm; Water; Entry; Transformation; Within

9529606 McCartney In this project PIs from Woods Hole and Scripps will carry out hydrographic cruises enclosing a large portion of the North Atlantic Sub Polar Gyre (SPG) between Greenland and the Azores. The hydrography will form the base of a much larger study of the circulation of the SPG, in which autonomous, subsurface floats will monitor both subsurface currents and the upper layer temperature and salinity structure over a two-year period. The first section will be occupied during the fall of 1996, in which floats will be deployed, and currents will be monitored using shipboard Acoustic Doppler Current Profilers. The second section will be occupied in the Spring of 1997, and will include a full suite of chemical tracers to assess the effects of winter time mixing. The principal goals are to study the transformation of the thick upper layer of relatively warm water over the course of the winter, to describe how that transformation is embedded in the general circulation of the North Atlantic Current and SPG, and to examine the branching of eastward flowing subtropical water from the North Atlantic Current into the SPG. Attention will also be paid to entrainment of upper and intermediate waters into deep overflows, the recirculation of intermediate and deep waters in the subpolar North Atlantic and the distribution of decadal changes throughout the subpolar region by comparison with historic data.

9529606麦卡特尼（McCartney）在伍兹洞（Woods Hole）和斯克里普斯（Scripps）的PIS中，麦卡特尼（McCartney）将进行水文巡游，围绕格陵兰岛和亚速尔群岛之间的北大西洋次极地Gyre（SPG）的大部分。 水文学将构成对SPG循环的更大研究的基础，在该研究中，自主的地下浮子将在两年内监测地下电流以及上层温度和盐度结构。 第一部分将在1996年秋天占用，其中将部署浮子，并使用船舶声型多普勒电流介绍者对电流进行监控。 第二部分将于1997年春季占用，并将包括一套化学示踪剂，以评估冬季混合的影响。 主要目标是研究冬季相对温水的厚上层的转化，以描述如何将这种转化嵌入北大西洋电流和SPG的一般循环中，并检查从北大西洋电流向东流动的次热带水的分支。 还将注意将上层和中间水域夹带到深层溢流中，与历史数据相比，北大西洋北大西洋中间和深水的再循环以及在整个亚极区域的衰落变化的分布。