越赤道气流特征及其年际变化特征初探

彭维耿; 蒋尚城

越赤道气流特征及其年际变化特征初探

彭维耿¹,
蒋尚城²

1.
民航银川空管站技术保障部, 宁夏, 银川, 750007
2.
北京大学地球物理系, 北京, 100871

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出版历程
- 收稿日期: 2001-02-14
- 修回日期: 2001-09-07

THE CLIMATIC CHARACTERISTICS OF GLOBAL CROSS- EQUATORIAL FLOW AND ITS INTERANNUAL VARIATION IN EAST HEMISPHERE

PENG Wei-geng¹,
JIANG Shang-cheng²

1.
Technology support bureau Yinchuan Air controll station of CAAC, Yinchuan 750007, China
2.
Department of Geophysics Peking University, Beijing 100871, China

摘要

摘要: 用1979～1999年共21年资料分析了全球越赤道气流的空间分布,并初步讨论了东半球低层主要通道越赤道气流强度的年际变化特征。结果表明,全球越赤道气流分布存在明显的空间不对称性,即通道分布的高低层不对称性和沿纬圈不对称。低层通道窄而多,高层通道宽而少;东半球低层通道数目远较西半球多,且强度更强。无论高、低层,夏季越赤道气流总和都强于冬季。这也反映了南北半球空气质量交换的时空分布的不对称性,即空气质量的交换主要集中在夏季和东半球。东半球低层越赤道气流的年际变化主要受TBO(2～3年周期)和ENSO(4～7年
- 越赤道气流通道 /
- 季风 /
- NCEPreanalysisdata /
- TBO /
- ENSO
Abstract: The characteristics of distribution of cross-equatorial flow (CEF) are analyzed, and the preliminary features of its interannual variation in the Eastern Hemisphere are discussed by using the NCEP data from 1979 to 1999. The results show that there is prominent dimensional asymmetry on the global cross-equatorial current on the vertical and latitudinal orientation. There are many narrow channels in low level but a few broad channels at upper level. The low-level channels are much more and stronger over the Eastern Hemisphere than the Western Hemisphere. The gross of CFE in the Eastern Hemisphere is stronger than that in the Western Hemisphere at high and low levels. This reflects the asymmetries of the exchange of the air mass between the Northern and Southern Hemisphere. It indicates that the exchange of the air mass is concentrated on the Eastern Hemisphere in summer. The variation of CFE the Eastern Hemisphere is mainly affected by TBO(2～3 years term) and ENSO(4～7 years term). It is interesting that the weak 85°E CEF in summer is mostly corresponding to the ENSO events. It means that the 85°E CEF intensity not only depends on the longitudinal circulation but also on the latitudinal circulation in tropics. The variation of 105°E CFE in winter is simultaneously affected by TBO and ENSO. The characteristics of interannual variation of cFE in each channel will eventrally affect the Asia monsoon and precipitation.
- cross equatorial flow /
- monsoon /
- reanalysis data /
- TBO /
- ENSO

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