Estimates of the turbulent kinetic energy budget in the oceanic convective boundary layer
Estimates of the turbulent kinetic energy budget in the oceanic convective boundary layer
复制标题
DOI：
10.1007/s10872-013-0215-3
复制
发表时间：
2014-01
影响因子：
2.3
通讯作者：
T. Endoh;T. Matsuno;Y. Yoshikawa;E. Tsutsumi
中科院分区：
文献类型：
--
作者：
T. Endoh;T. Matsuno;Y. Yoshikawa;E. Tsutsumi
本文利用东海大陆架上空微结构观测资料，估算了海洋对流边界层（CBL）中的稳态湍流动能（TKE）收支项。耗散项是从微尺度垂直剪切水平速度直接测量使用自由落体微结构剖面仪计算，而浮力通量和剪切生产项估计间接垂直集成的一维密度守恒方程和应用相似理论，分别。的运输条款，计算为其他三个条款的剩余，垂直重新分配的TKE从上半部分的CBL的下半部分，与TKE预算在大气CBL和在无剪切和轻微剪切CBL模拟大涡模拟模型。传输项对TKE预算的贡献相对较大，表明TKE方程的局部平衡形式不适合于海洋CBL中的TKE预算。
The terms of the steady-state turbulent kinetic energy (TKE) budget in the oceanic convective boundary layer (CBL) are estimated by use of microstructure data obtained over the continental shelf of the East China Sea. The dissipation term is calculated from the micro-scale vertical shear of horizontal velocity measured directly using a freely-falling microstructure profiler, whereas the buoyancy flux and shear production terms are estimated indirectly by integrating vertically the one-dimensional conservation equation of density and by applying similarity theory, respectively. The transport term, calculated as the residual of the other three terms, vertically redistributes the TKE from the upper half of the CBL to the lower half, consistent with the TKE budgets in the atmospheric CBL and in shear-free and slightly-sheared CBLs simulated by large eddy-simulation models. The relatively large contribution of the transport term to the TKE budget shows that a local equilibrium form of the TKE equation is not appropriate for the TKE budget in the oceanic CBL.