The Mean Meridional Circulation of the Atmosphere Using the Mass above Isentropes as the Vertical Coordinate
The Mean Meridional Circulation of the Atmosphere Using the Mass above Isentropes as the Vertical Coordinate
复制标题
以等熵线上方的质量为纵坐标的大气平均经向环流
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Gang Chen
中科院分区：
文献类型：
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作者：
Gang Chen
本文用等熵线上方的质量（更具体地说，是与质量相对应的压力）作为垂直坐标，给出了大气的平均纬向环流。在这个垂直坐标系中，质量加权平均环流被熵源和熵汇精确平衡，没有像等熵坐标系中那样的涡动通量贡献，并且该坐标可以通过构造容易地推广到湿等熵或其他准保守示踪物上方的质量。相应的Eliassen-Palm（EP）通量散度的纬向平均角动量制定在一个混合的等压等熵的形式，扩展传统的转换欧拉平均（TEM）制定有限振幅的非地转涡旋的球体上。在小振幅极限下，混合等压等熵公式简化为TEM公式。适用于NCEP-U.S.能源部（DOE）再分析2，新的配方解决了传统配方的不足。
AbstractThe mean meridional circulation of the atmosphere is presented using the mass (more specifically, the pressure corresponding to the mass) above the isentrope of interest as the vertical coordinate. In this vertical coordinate, the mass-weighted mean circulation is exactly balanced by entropy sources and sinks with no eddy flux contribution as in the isentropic coordinate, and the coordinate can be readily generalized to the mass above moist isentropes or other quasi-conservative tracers by construction. The corresponding Eliassen–Palm (EP) flux divergence for the zonal-mean angular momentum is formulated in a hybrid isobaric–isentropic form, extending the conventional transformed Eulerian-mean (TEM) formulation to finite-amplitude nongeostrophic eddies on the sphere. In the small-amplitude limit, the hybrid isobaric–isentropic formulation reduces to the TEM formulation.Applying to the NCEP–U.S. Department of Energy (DOE) Reanalysis 2, the new formulation resolves the deficiency of the conventional...