Seasonal variation of mass transport across the tropopause
Seasonal variation of mass transport across the tropopause
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DOI：
10.1029/96jd00821
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发表时间：
1996-06-27
影响因子：
4.4
通讯作者：
Rosenlof, KH
中科院分区：
文献类型：
--
作者：
Appenzeller, C;Holton, JR;Rosenlof, KH
本文研究了对流层顶外物质净输送的年周期。全球尺度的纬向环流和平流层最低层的质量变化的贡献。对于北方半球，平流层最低层的质量有明显的年周期，而对于南半球，相应的变化很弱。北方对流层顶净物质输送在春末有一个最大值，秋季有一个明显的最小值。这种变化及其幅度与基于代表性Sr-90混合比的较早估计值相当。对于南半球的净质量输送的季节性周期较弱，大致遵循附近的等熵面净质量通量的年度变化。
The annual cycle of the net mass transport across the extratropical tropopause is examined. Contributions from both the global-scale meridional circulation and the mass variation of the lowermost stratosphere are included. For the northern hemisphere the mass of the lowermost stratosphere has a distinct annual cycle, whereas for the southern hemisphere, the corresponding variation is weak. The net mass transport across the tropopause in the northern hemisphere has a maximum in late spring and a distinct minimum in autumn. This variation and its magnitude compare well with older estimates based on representative Sr-90 mixing ratios. For the southern hemisphere the seasonal cycle of the net mass transport is weaker and follows roughly the annual variation of the net mass flux across a nearby isentropic surface.