3D Salt Finger Fluxes in the Thermocline

0092504 Stern在Prandtl数为7，刘易斯数为0.01，密度比在1和2之间的无界海洋中，通过三维和二维Boussinesq方程的数值计算的组合，将确定透空热通量和盐通量。模式的未扰动状态由均匀的温度和盐度梯度组成，其中盐指形成并最终导致统计稳定状态。无量纲热通量，即，努塞尔数和热/盐通量比则仅取决于普朗特数、刘易斯数和密度比。数值结果将与在中大西洋的基础上染料分散和解释热微观结构的考克斯方法的观测结果进行比较。数值计算得到的通量定律也应该局部适用于等密度表面上的温度和盐度的薄侧向侵入体中含有相对较大的垂直梯度的温跃层区域。

0092504 SternThe diapycnal heat and salt flux in an unbounded ocean with Prandtl number of 7, Lewis number of 0.01, and various density ratios between 1 and 2, will be determined by a combination of numerical calculations from the three-dimensional and two-dimensional Boussinesq equations, The undisturbed state of the model consists of a uniform temperature and salinity gradients, wherein salt fingers form and eventually lead to a statistically steady state. The non-dimensional heat flux, i.e., the Nusselt number, and the heat/salt flux ratio then depend only on the Prandtl number, Lewis number and density ratio. The numerical results will be compared with observations taken in the Central Atlantic based on dye dispersion and on the Cox method for interpreting thermal microstructure. The numerically obtained flux laws should also be locally applicable to regions of the thermocline containing relatively larger vertical gradients in thin lateral intrusions of temperature and salinity on isopycnal surfaces.