RAPID: Microstructure Observations of Rapid Surface Freshening in the Labrador Sea
RAPID:拉布拉多海表面快速清新的微观结构观测
基本信息
- 批准号:1036097
- 负责人:
- 金额:$ 10.66万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2010
- 资助国家:美国
- 起止时间:2010-05-01 至 2011-04-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
A longstanding mystery in deep convection regions concerns the rapid surface capping after deep convection. In the Labrador Sea, this capping takes the form of a thin freshwater layer, regularly seen across the entire 600 km diameter basin in April or May shortly after the deepest convection in March. This freshwater appears to have been imported from the boundary currents at the basin's periphery, but Ekman transport distributed over the 30 m mixed layer would be far too slow. Since models of overturning circulation variability frequently begin with a freshwater perturbation over the deep water formation region, the mechanism for transporting boundary freshwater to the convected interior is an important link in the climate system.The origin of the rapid freshwater capping will be investigated during the spring 2010 hydrographic cruise across the Labrador Sea by the Bedford Institute of Oceanography (BIO). A novel measurement platform, the Air-Sea Interaction Profiler (ASIP) developed by Brian Ward of the University of Galway, will be used. This upward-profiling autonomous instrument records microstructure temperature and conductivity as well as turbulent shear, and in particular resolves the uppermost centimeters of the ocean including the centimeter scale salinity skin layer. Repeated measurements will give an indication of the spatial and temporal variability with far greater resolution than the roughly 50 km CTD station spacing. Microstructure shear measurements would help quantify the turbulent mixing within the halocline and therefore shed light on its formation. Different lateral flux processes could be distinguished by their degree of vertical and horizontal homogeneity and by the associated levels of mixing activity. This untethered instrument will sample the upper ten meters which are normally contaminated by the ship wake in the CTD stations.The intellectual merit of this project is an improved understanding of freshwater transport and halocline formation in the deep convecting region of the Labrador Sea, one of the key regions in the Atlantic Meridional Overturning Circulation. The primary broader impact is the relevance this work has for our understanding of climate variability, in particular, the sensitivity of the overturning circulation to freshwater perturbations. A post-doc will received training in making at sea measurements in a multi-national project.
深对流区的一个长期未解之谜是深对流后的快速地表覆盖。在拉布拉多海,这种覆盖以薄淡水层的形式出现,在3月最深对流之后不久的4月或5月,在整个直径600公里的盆地中经常看到。这种淡水似乎已经进口的边界电流在盆地的外围,但埃克曼运输分布在30米的混合层将太慢。由于翻转环流变率的模式经常开始与淡水扰动的深水形成区,输送边界淡水对流内部的机制是一个重要的环节,在气候system.Origin的快速淡水盖层将在2010年春季横跨拉布拉多海的水文巡航期间由贝德福德海洋学研究所(BIO)调查。将使用一个新的测量平台,即由高威大学的Brian Ward开发的海气相互作用剖面仪。这一向上剖面的自主仪器记录了微结构温度和电导率以及湍流剪切,特别是解析了海洋最上层的厘米,包括厘米尺度的盐度表层。重复测量将显示空间和时间的变化,其分辨率远高于约50公里CTD站间距。微结构剪切测量将有助于量化盐跃层内的湍流混合,从而揭示其形成。不同的横向通量过程可以通过它们的垂直和水平均匀性程度以及相关的混合活动水平来区分。这种无绳式仪器将对通常被CTD站中的船舶尾流污染的上部十米进行采样。该项目的智力价值是提高了对拉布拉多海深对流区域淡水输送和盐跃层形成的认识,拉布拉多海是大西洋经向翻转环流的关键区域之一。主要的更广泛的影响是这项工作的相关性,我们的气候变化的理解,特别是,翻转环流淡水扰动的敏感性。一名博士后将在一个跨国项目中接受海上测量培训。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Jonathan Lilly其他文献
Jonathan Lilly的其他文献
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