SGER: Differential Mixing by Breaking Internal Waves

SGER：通过破坏内波进行差分混合

• 批准号: 9816528
• 负责人: David Hebert
• 金额: $ 3.8万
• 依托单位: University of Rhode Island
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-10-01 至 2000-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9816528&HistoricalAwards=false
• 关键词: SGER; Differential; Mixing; Breaking; Internal

HebertA series of laboratory experiments will be conducted to assess whether turbulent mixing by breaking internal waves can produce different effective diffusivities for scalars with different molecular diffusivities (e.g., heat and salt). Thispossibility was first raised by Ann Gargett in 1988 based on scaling arguments, but has not yet been confirmed by observations. In order to test this hypothesis, fluxes of slat and other tracers will be measured in a stratified tank containing internal waves which are breaking intermittently and randomly. From these measurements effective diffusivities for a set of simple experiments will be calculated to establish if the hypothesis of differential mixing canbe substantiated. Small differences in the mixing coefficient of heat and salt could have a large effect on thedensity flux in the ocean.

Hebert将进行一系列实验室实验，以评估通过破碎内波进行湍流混合是否会对具有不同分子扩散率的标量产生不同的有效扩散率（例如，热和盐）。1988年，Ann加吉特基于尺度论首次提出了这种可能性，但尚未得到观测的证实。为了检验这一假设，将在一个含有间歇性和随机破碎的内波的分层水槽中测量盐缝和其他示踪剂的通量。从这些测量的有效扩散系数为一组简单的实验将被计算，以建立如果差分混合的假设可以得到证实。热盐混合系数的微小差异可能对海洋中的密度通量产生很大影响。