Warm Water Entry and Transformation Within the Subpolar North Atlantic

在这个项目中，来自伍兹霍尔和斯克里普斯的pi将在格陵兰岛和亚速尔群岛之间的北大西洋亚极地环流（SPG）的大部分区域进行水文巡航。该水文图将成为SPG环流研究的基础，在该研究中，自主的地下浮子将在两年的时间内监测地下流和上层温度和盐度结构。第一段将于1996年秋季使用，届时将部署浮子，并使用船载声学多普勒电流剖面仪监测海流。第二部分将于1997年春季使用，其中将包括一整套化学示踪剂，以评估冬季混合的影响。主要目标是研究冬季中较厚的上层相对温暖的水的转变，描述这种转变如何嵌入北大西洋洋流和SPG的总环流中，并检查从北大西洋洋流向东流动的亚热带水进入SPG的分支。还将注意上层和中层水域被卷入深水溢出、北大西洋亚极区中层和深水的再循环以及与历史资料比较整个亚极区年代际变化的分布。

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.