Mixing Layer Formation near the Tropopause Due to Gravity Wave–Critical Level Interactions in a Cloud-Resolving Model
Mixing Layer Formation near the Tropopause Due to Gravity Wave–Critical Level Interactions in a Cloud-Resolving Model
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DOI：
10.1175/jas-3289.1
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发表时间：
2004-12
影响因子：
3.1
通讯作者：
M. Moustaoui;Binson Joseph;Hector Teitelbaum
中科院分区：
文献类型：
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作者：
M. Moustaoui;Binson Joseph;Hector Teitelbaum
摘要 使用高分辨率、二维 (2D)、非弹性、非线性、云解析模拟，对热带对流区域上方平流层下部形成混合层的合理机制进行了数值论证。值得注意的一点是，本研究中模拟的混合层没有砧云，并且远高于对流层上层的云砧顶部。因此，本机制是对众所周知的过程的补充，通过该过程，过冲的云塔会导致平流层砧云内的混合。该论文被组织为一个案例研究，使用在中赤道太平洋实验（CEPEX）期间获得的大气探测来验证所提出的机制，当时观察到了几个这样的没有砧云的混合层。本机制的基本动力成分是（准静止）重力波-临界水平相互作用，与平流层西风带向东风带的逆转有关......
Abstract A plausible mechanism for the formation of mixing layers in the lower stratosphere above regions of tropical convection is demonstrated numerically using high-resolution, two-dimensional (2D), anelastic, nonlinear, cloud-resolving simulations. One noteworthy point is that the mixing layer simulated in this study is free of anvil clouds and well above the cloud anvil top located in the upper troposphere. Hence, the present mechanism is complementary to the well-known process by which overshooting cloud turrets causes mixing within stratospheric anvil clouds. The paper is organized as a case study verifying the proposed mechanism using atmospheric soundings obtained during the Central Equatorial Pacific Experiment (CEPEX), when several such mixing layers, devoid of anvil clouds, had been observed. The basic dynamical ingredient of the present mechanism is (quasi stationary) gravity wave–critical level interactions, occurring in association with a reversal of stratospheric westerlies to easterlies b...