Gulf Stream Upper Ocean Studies

湾流上层海洋研究

• 批准号: 8817698
• 负责人: Terrence Joyce
• 金额: $ 26.21万
• 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: 1989
• 资助国家: 美国
• 起止时间: 1989-02-15 至 1991-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8817698&HistoricalAwards=false
• 关键词: Gulf; Stream; Upper; Ocean; Studies

Soon after it leaves Cape Hatteras, the Gulf Stream transport increases to values in excess of 150 SV, over five times that of the Flordia Current and what is necessary for the interior Sverdrup balance. Little is known about the structure of the recirculation regime responsible for the transport increase or the nature of its variability. Altimeter measurements at the sea surface suggest that the spectrum of variability is brood, encompassing rapid, possibly barotropic shifts in the Gulf Stream with time scales of order a month or less, to annual and interannual variations, which may be both barotropic and baroclinic, the latter associated with the field of mass. We propose to investigate this range of time scales by combining repeated shipboard measurements of the Gulf Stream, mainly using XBT and acoustic Doppler sections, with satellite infraed images and GEOSAT altimeter data. The shipbopard measurements will provide some estimates of the rapid variability of the Gulf Stream system and its vertical structure to depths of 800 m with special emphasis on a line from the continental shelfff south of the Cape Cod to Bermuda. Inverse calculations combining varying subsets of the shipboard data can assess the degree to which the rapid mode of variability affects resulting solutions for mass budgets of the region. Two cruises are envisioned, each of 17-day duration, at times of the year when the Gulf Stream reaches its climatological exetrmes of position and transport. Together with the altimeter data, each cruise will provide an independent estimate of the surface geoid along a track coincident with the GEOSAT altimeter as well as the three dimensional structure of the Gulf Stream system at the time of the cruises. The altimetric measurements will be used to extend the spatial and temproal sampling from the cruises to encompass scales of meanders and annual/interannual variability. The methods employed are analogous to those envisioned for the Topography Experiment for Ocean Circulation (TOPEX and French POSEIDON) and in situ data during the World Ocean Circulation Experiment (WOCE).

离开哈特拉斯角后不久，墨西哥湾流运输 增加到超过150 SV的值，超过5倍， 以及内陆所需的 Sverdrup平衡。 关于它的结构我们知之甚少 再循环制度负责运输增加或 其可变性的本质。 高度计测量， 海面表明，变化的频谱是育雏， 包括墨西哥湾快速的，可能是正压的变化， 河流的时间尺度为一个月或更少，每年和 年际变化，这可能是正压和 斜压，后者与质量场有关。 我们 我建议通过结合 对墨西哥湾流的反复船上测量，主要是 使用XBT和声学多普勒剖面， 图像和GEOSAT高度计数据。 希波帕德测量 将提供一些估计的快速变化的 墨西哥湾流系统及其垂直结构，深度为800 我特别强调从大陆架开始的一条线f 从科德角南部到百慕大 逆计算 组合船上数据的不同子集可以评估 快速变化模式对结果的影响程度 解决该地区的大规模预算问题。 两艘邮轮是 在一年中的某些时候， 墨西哥湾流到达气候极限 和交通。 加上高度计数据，每次巡航 将提供一个独立的估计表面大地水准面沿着 一个轨道重合的GEOSAT高度计以及 墨西哥湾流系统的三维结构， 巡航的时间。 高度测量将用于 扩大巡航的空间和时间采样， 包括曲流和年际尺度 可变性 所采用的方法类似于 海洋环流地形实验 （TOPEX和法国POSEIDON）和世界期间的现场数据 海洋环流实验。