Warm Water Entry and Transformation Within the Subpolar North Atlantic

9529584在该项目中，伍兹霍尔和斯克里普斯的PI将进行环绕格陵兰岛和亚速尔群岛之间的北大西洋亚极地环流(SPG)很大一部分的水文巡航。这项水文学将构成对SPG环流的更大规模研究的基础，在该研究中，自主的地下浮标将在两年内监测地下洋流以及上层的温度和盐度结构。第一部分将于1996年秋季投入使用，其中将布放浮标，并将使用船上的声学多普勒海流剖面仪监测海流。第二部分将于1997年春季投入使用，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期间较暖的厚上层水的转化，描述这种转化如何嵌入北大西洋洋流和太平洋环流的一般环流中，并研究从北大西洋洋流向东流动的副热带水进入太平洋洋流的分支。还将注意上层和中层水进入深溢流，北大西洋次极地中层和深层水的再循环，以及与历史数据相比整个亚极区的年代际变化的分布情况。

9529584 Talley 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.