| 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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| 作者姓名： | 况雪源 黄梅丽 林振敏 黄雪松 |
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| 基金项目： | Research on the Evolutionary Patterns of Droughts and Floods in Guangxi Under the
Conditions of Climate Warming, a Guangxi Young Scientists project (0542001); Soft Science Project from
China Meteorological Administration (2008012); Research and Technical Development for Guangxi Institute of
Meteorological Sciences (200713) |
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| 摘 要： | 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
3-year 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 low
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.
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| 关 键 词： | Guangxi annually first rainy season rainfall decadal variation SST in Indian Ocean |
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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| KUANG Xue-yuan,HUANG Mei-li,LIN Zhen-min and HUANG Xue-song.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[J].Journal of Tropical Meteorology,2008,14(2):137-140. |
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| Authors: | KUANG Xue-yuan HUANG Mei-li LIN Zhen-min and HUANG Xue-song |
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| Institution: | 1. Guangxi Climate Center, Nanning 530022 China
2. Guangxi Institute of Meteorology and Disaster-Reducing Research, Nanning 530022 China |
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| Abstract: | 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
3-year 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 low
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. |
| |
| Keywords: | Guangxi annually first rainy season rainfall decadal variation SST in Indian Ocean |
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