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首页> 外文期刊>Journal of the Atmospheric Sciences >Tropical and Subtropical Meridional Latent Heat Transports by Disturbances to theZonal Mean and Their Role in the General Circulation
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Tropical and Subtropical Meridional Latent Heat Transports by Disturbances to theZonal Mean and Their Role in the General Circulation

机译：热带和亚热带子午线潜热传递对地均值的扰动及其在整体环流中的作用

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摘要

The spectrum of meridional latent heat transport in the tropics and subtropics by disturbances to the zonal mean during all seasons is analyzed. The transport is divided into stationary and transient planetary- and subplanetary-scale eddy contributions. The stationary transport is largest in the subtropical lower troposphere and dominates the overall transport during summer. It is of planetary scale and the zonal scale of the transport corresponds to the number of subtropical anticyclones. The transient transport is large from the surface up to the midtroposphere and from the tropics to subpolar latitudes. It is dominated by the subplanetary-scale contribution during all seasons. Westward (eastward)- propagating waves dominate the transport in the tropics (subtropics and midlatitudes). The analysis reveals that, while the total eddy meridional latent heat transport is seamless from the deep tropics to the pole, it represents the sum of transport by distinct dynamical features. The role of the eddy meridional latent heat transport in the moist isentropic circulation is assessed using the statistical transformed Eulerian mean formulation, which converts the eddy transports into streamfunctions. The addition of the eddy latent heat streamfunction to the Eulerian mean plus eddy sensible heat stream-function increases the mass transport by a factor of 2-3 in the subtropics and midlatitudes. The eddy transport is found to dominate the transport across the subtropical boundary. During Northern Hemisphere summer there is virtually no circulation in the absence of eddy latent heat transport. The results highlight the important role of latent heat transport by subtropical anticyclones and tropical and baroclinic waves in the general circulation.
机译：分析了所有季节对纬向平均数的干扰对热带和亚热带的子午潜热传输谱的影响。运移分为静止的和过渡的行星和副行星尺度的涡流贡献。在亚热带低层对流层中，固定运输量最大，夏季占主导地位。它是行星尺度的，运输的纬向尺度对应于亚热带反气旋的数量。从表面到对流层中层以及从热带到亚极纬度的瞬态传输都很大。在所有季节中，次行星规模的贡献占主导地位。向西（向东）传播的波控制着热带（亚热带和中纬度）的运输。分析表明，虽然从深热带到极地总的涡流子午潜热传输是无缝的，但它通过独特的动力学特征代表了传输的总和。涡流子午潜热传输在湿等熵循环中的作用是使用统计转换的欧拉均值公式评估的，该公式将涡流传输转换为流函数。在亚热带和中纬度地区，在欧拉均值上加上涡流潜热函数，再加上涡流显热流函数，使传质量增加了2-3倍。发现涡流占主导地位的是跨亚热带边界的迁移。在北半球夏季，在没有涡流潜热传输的情况下，几乎没有循环。研究结果突显了亚热带反气旋以及热带和斜斜波在整体环流中潜热传输的重要作用。

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