首页|STUDY ON THE RELATIONSHIP BETWEEN THE DECADAL VARIATIONS OF ANNUALLY FIRST RAINY SEASON PRECIPITATION OF GUANGXI AND SEA SURFACE TEMPERATURE OF INDIAN OCEAN IN SOUTHERN HEMISPHERE

STUDY ON THE RELATIONSHIP BETWEEN THE DECADAL VARIATIONS OF ANNUALLY FIRST RAINY SEASON PRECIPITATION OF GUANGXI AND SEA SURFACE TEMPERATURE OF INDIAN OCEAN IN SOUTHERN HEMISPHERE

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Decadal circulation differences between more and less rainfall periods in the annually first rainy season of Guangxi and their association with sea surface temperature (SST) of the austral Indian Ocean are investigated by using the NCEP/NCAR reanalysis data. The results are shown as follows. A pattern in which there is uniform change of the Guangxi precipitation shows a 20-year decadal oscillation and a 3oyear interannual change. In contrast, a pattern of reversed-phase change between the north and the south of Guangxi has a 6-year interannual periodicity and quasi-biennial oscillation. In the period of more precipitation, the surface temperature in Eurasia is positively anomalous so as to lead to stronger tow pressure systems on land and larger thermal contrast between land and ocean. Therefore, the air column is more unstable and ascending flows over Guangxi are intensified while the Hadley cell is weakened. Furthermore, the weaker western Pacific subtropical high and South Asia High, together with a stronger cross-equatorial flow, result in the transportation of more humidity and the appearance of more precipitation. The correlation analysis indicates that the Indian Ocean SST in Southern Hemisphere is closely associated with the variation of the seasonal precipitation of Guangxi on the decadal scale by influencing the Asian monsoon through the cross-equatorial flow.

Guangxiannually first rainy season rainfalldecadal variationSST in Indian Ocean

KUANG Xue-yuan、HUANG Mei-li、LIN Zhen-min、HUANG Xue-song

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Guangxi Climate Center, Nanning 530022 China

Guangxi Institute of Meteorology and Disaster-Reducing Research, Nanning 530022 China

Research on the Evolutionary Patterns of Droughts and Floods in Guangxi Under the Conditions of Climate WarmingGuangxi Young Scientists projectSoft Science Project from China Meteorological AdministrationResearch and Technical Development for Guangxi Institute of Meteorological Sciences

05420012008012200713

2008

热带气象学报(英文版)
中国气象局广州热带海洋气象研究所

热带气象学报(英文版)

SCI
影响因子：0.169
ISSN：1006-8775
年,卷(期)：2008.14(2)
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