Page 46 - 《高原气象》2022年第6期

6 期 杜梦莹等：亚洲季风区内北半球秋季哈德莱环流特征及其与热带海温之间关系 1409
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Characteries of Boreal Autumn Hadley Circulation over the Asian

Domain and Its Relationship with Tropical SST

1
DU Mengying ，LI Yan ，FENG Juan 2
1
（1. School of Atmospheric Sciences，Lanzhou University，Lanzhou 730000，Gansu，China；
2. College of Global Change and Earth System Science，Beijing Normal University，Beijing 100875，China）
Abstract：Using the Hadley Centre Sea Ice and Sea Surface Temperature dataset and NCEP reanalysis data dur‐
ing 1979-2020，this paper analyzes the characteries of boreal autumn Hadley circulation（HC）over the Asian
domain and its relationship with tropical sea surface temperature. The results find that the autumn regional HC is
equatorial asymmetric in the last 42 years，with ascending branch located near the equator and sinking branch in
the subtropical. The first model（EOF1）accounts for 59%，and the spatial distribution of the autumn regional
HC is equatorial asymmetric，with the northern cell is dominant and larger than the southern cell. The ascending
branch located to the south of the equator，The time distribution shows an interannual variation and it’s related to
the ENSO（El Niño-Southern Oscillation）. During the La Niña events，the Tropical Indian Ocean（TIO）exists
the significant negative anomaly and the abnormal cooling in the northern Indian Ocean is greater than that in the
southern Indian Ocean，which leads to the anomalous meridional gradient in the TIO. It promotes the formation
of EOF1. The EOF2 accounts for 15%，and the spatial distribution in the EOF2 shows that the southern cell is
consistent with the region HC ascending branch range. The temporal distribution shows an increasing trend. The
range of the rising branch is related to the warming trend of the TIO southern and northern hemispheres in the
Asian monsoon region. The warming rate of the northern TIO is faster than the southern TIO，resulting in region‐
al HC ascending scope of the north.
Key words：Regional Hadley Circulation；La Niña events；ENSO；Sea Surface Temperature；tropical Indian
Ocean