SGER: Exploration of a Tracer Patch in the Tropical Atlantic and Caribbean Sea

SGER：热带大西洋和加勒比海示踪斑块的探索

• 批准号: 0244256
• 负责人: James Ledwell
• 金额: $ 9.9万
• 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: 2002
• 资助国家: 美国
• 起止时间: 2002-11-01 至 2003-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0244256&HistoricalAwards=false
• 关键词: SGER; Exploration; Tracer; Patch; Tropical

Exploration of a Tracer Patch in the Tropical Atlantic and Caribbean SeaJ. LedwellWHOISampling of a tracer patch released in 2001 in the tropical Atlantic Ocean and Caribbean Sea is proposed. The main goals of the sampling are to quantify the surprisingly large zonal dispersion of the tracer in the tropical Atlantic, and to measure the diapycnal diffusivity of the tracer in the pycnocline of the Caribbean, where susceptibility to salt fingering is nearly as great as east of Barbados, but where thermohaline staircases are rare. Other important goals are to determine the nature of the apparent sinking of the tracer distribution in the staircase region east of Barbados, to obtain a 2-year measurement of the diapycnal diffusivity there, and to determine the westward extent of the tracer patch at 2 years. Exploration of zonal dispersion in both the Atlantic and Caribbean will provide unique data with which to compare models of ocean circulation, and may help to improve knowledge of shear across the subtropical front. Measurement of diapycnal diffusivity in the Caribbean will improve parameterizations of mixing as a function of density ratio, i.e., as a function of temperature and salinity gradients, in salt-finger favorable regions with high shear. The nature of the survey is exploratory in all of its goals, and furthermore, the request for support is temporally urgent because of the speed with which the tracer patch will spread and be swept through the region of the study. Sampling should be done in 2003.

在热带大西洋和加勒比海j中探索示踪剂斑块。提议在2001年在热带大西洋和加勒比海发行的示踪剂贴片的LedwellwhwhwhoIsampling。 The main goals of the sampling are to quantify the surprisingly large zonal dispersion of the tracer in the tropical Atlantic, and to measure the diapycnal diffusivity of the tracer in the pycnocline of the Caribbean, where susceptibility to salt fingering is nearly as great as east of Barbados, but where thermohaline staircases are rare.其他重要的目标是确定巴巴多斯以东楼梯区域示踪剂分布明显下沉的性质，以获得对那里的二元性扩散率的2年测量，并确定2年在示踪剂斑块的西部范围。探索大西洋和加勒比海地区的纬向色散将提供与海洋循环模型进行比较的独特数据，并可能有助于提高亚热带锋线的剪切知识。在盐指的有利的区域中，加勒比海中二比扩散率的测量将改善与密度比的混合参数化，即作为温度和盐度梯度的函数。调查的性质在其所有目标上都是探索性的，此外，由于示踪剂贴片将在研究区域中传播并席卷示踪剂的速度，因此暂时的支持请求在时间上是紧迫的。抽样应在2003年进行。