Leaky rigid lid: New dissipative modes in the troposphere
Leaky rigid lid: New dissipative modes in the troposphere
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漏水的刚性盖：对流层中的新耗散模式
DOI：
10.1175/jas-d-12-065.1
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发表时间：
2013
影响因子：
3.1
通讯作者：
E. Tabak
中科院分区：
文献类型：
--
作者：
L. Chumakova;R. Rosales;E. Tabak
在对流层顶波辐射条件的基础上，导出了对流层顶部的有效边界条件。这种边界条件可以表示为一个拟微分方程组，它导致了新的垂直耗散模式。这些模式可以在流体静力、不旋转的大气的经典设置中显式计算，该大气具有分段恒定的布伦特-V欧元欧元频率。在无限强层结平流层的极限下，这些模失去了耗散性质，成为刚性盖子近似下的规则斜压对流层模。对于层化的实际值，thedecaytimescalesofthefirstfewmodesformesoscaledisturbancesrangefromanhourto为一周，这表明某些大气现象的时间尺度可能是通过向上传播的波的能量损失率来建立的。
An effective boundary condition is derived for the top of the troposphere, based on a wave radiation condition at the tropopause. This boundary condition, which can be formulated as a pseudodifferential equation, leads to new vertical dissipative modes. These modes can be computed explicitly in the classical setup of a hydrostatic, nonrotating atmosphere with a piecewise constant Brunt‐V€€€ frequency. In the limit of an infinitely strongly stratified stratosphere, these modes lose their dissipative nature and become the regular baroclinic tropospheric modes under the rigid-lid approximation. For realistic values of thestratification,thedecaytimescalesofthefirstfewmodesformesoscaledisturbancesrangefromanhourto a week, suggesting that the time scale for some atmospheric phenomena may be set up by the rate of energy loss through upward-propagating waves.