Laboratory Measurements of Heat and Salt Fluxes in Double-Diffusive Interleaving

双扩散交错中热通量和盐通量的实验室测量

• 批准号: 0242535
• 负责人: Ruby Krishnamurti
• 金额: $ 17.84万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-04-01 至 2007-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0242535&HistoricalAwards=false
• 关键词: Laboratory; Measurements; Heat; Salt; Fluxes

ABSTRACTOCE-0242535Two classes of experiments on doubly diffusive intrusions will be conducted in the laboratory. The first is the intrusive interleaving produced in the classical arrangement of property discontinuity when a sluice-gate is withdrawn which had separated salt-stratified water from sugar-stratified water. (Salt in the laboratory experiment is used as a proxy for cold in the ocean, slow-diffusing sugar as a proxy for ocean salt.). The second is a new arrangement in which a continuous horizontal gradient of salinity is density-compensated by an opposing continuous horizontal gradient of sugar, and interleaving intrusions grow everywhere simultaneously. These experiments will be performed for doudbly-stable, for salt-fingering, and for diffusive stratification. For both classes of flows modern quantitative measurements techniques such as particle-Image Velocimetry for horizontal and vertical components, color polarimetry and synthetic Schlieren for sugar concentration and density field will be used to determine the horizontal and vertical fluxes of temperature (T) and salt (S), as they vary with imposed gradients. The anticipated results of this study are (1) a determination of flux laws relating fluxes of T and S to imposed gradients; (2) a determination of relationship of horizontal to vertical fluxes and (3) a diagnosis of instability mechanisms and test of linear stability theories.The discovery of flux laws which can be scaled up to determine the magnitude of horizontal mixing in oceanic fronts is anticipated. Since the resulting modified waters participate in the global thermohaline circulation, the degree of mixing modifies the poleward transport of heat which is a crucial component of the consequences of global warming. Teaching and training will be promoted through the integration of research results and use of the laboratory facilities in many layers of teaching, including graduate students and undergraduate Honors Science Seminar students projects and an international partnership with the Dept. of Environmental Engineering, University of Genoa.

在实验室中将进行两类关于双扩散侵入体的实验。 第一种是在传统的财产不连续安排中，当一个将盐层水和糖层水分开的闸门被拆除时，产生的侵入性交错。 (Salt在实验室实验中，用缓慢扩散的糖作为海洋盐分的代表。 第二个是一个新的安排，其中连续的水平梯度的盐度是密度补偿的连续水平梯度的糖，和交错的侵入体生长的同时无处不在。 这些实验将针对双重稳定、盐指和扩散分层进行。 对于这两类流动，将使用现代定量测量技术，如用于水平和垂直分量的粒子图像测速法，用于糖浓度和密度场的彩色偏振法和合成纹影法，以确定温度（T）和盐（S）的水平和垂直通量，因为它们随施加的梯度而变化。 本研究的预期结果是：（1）确定T和S通量与外加梯度的通量定律;（2）确定水平通量与垂直通量的关系;（3）诊断不稳定机制和检验线性稳定性理论。 由于由此产生的改性沃茨参与全球温盐环流，混合的程度改变了热量向极地的输送，这是全球变暖后果的一个重要组成部分。 教学和培训将通过研究成果的整合和实验室设施的使用在教学的许多层面，包括研究生和本科生荣誉科学研讨会的学生项目和与系的国际合作伙伴关系，促进。热那亚大学环境工程系。