SGER: Differential Mixing by Breaking Internal Waves

HebertA系列的实验室实验将评估破碎内波的湍流混合是否会对不同分子扩散系数的标量（如热和盐）产生不同的有效扩散系数。这种可能性最初是由Ann Gargett在1988年基于尺度论点提出的，但尚未被观测证实。为了验证这一假设，将在一个含有间歇和随机破碎的内波的分层槽中测量板条和其他示踪剂的通量。根据这些测量结果，将计算出一组简单实验的有效扩散系数，以确定微分混合的假设是否能够得到证实。热盐混合系数的微小差异会对海洋中的密度通量产生很大的影响。

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.