SGER: Differential Mixing by Breaking Internal Waves

赫伯特将进行一系列实验室实验，以评估通过破裂内波进行的湍流混合是否可以为具有不同分子扩散系数(例如，热和盐)的标量产生不同的有效扩散系数。这种可能性最早是由Ann Gargett在1988年基于比例论提出的，但尚未被观测证实。为了验证这一假设，将在含有间歇性和随机破裂的内波的分层水池中测量板岩和其他示踪剂的通量。根据这些测量结果，将计算一组简单实验的有效扩散系数，以确定差异混合假说是否成立。热和盐混合系数的微小差异可能会对海洋中的密度通量产生很大影响。

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.