| INTERANNUAL VARIABILITY OF WINTER AND SPRING PRECIPITATION IN SOUTH CHINA AND ITS RELATION TO MOISTURE TRANSPORT |
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| 作者姓名： | 吴蔚 温之平 陈运光 崔少萍 |
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| 作者单位： | Bureau of Meteorology, Huizhou 516003 China;Research Center for Monsoon and Environment and Department of Atmospheric Sciences, Sun Yat-sen University, Guangzhou 510275 China;Research Center for Monsoon and Environment and Department of Atmospheric Sciences, Sun Yat-sen University, Guangzhou 510275 China;Bureau of Meteorology, Huizhou 516003 China;Bureau of Meteorology, Huizhou 516003 China |
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| 基金项目： | National Key Basic Research Program of China (2014CB953902); National Natural Science Foundation of China (41175076, 412111046) |
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| 摘 要： | The interannual variability of winter and spring precipitation in South China(SC)and its relation to moisture transport are investigated by using the monthly precipitation data of NMIC,NCEP reanalysis datasets and NOAA ERSST analysis datasets from 1960 to 2008.The results show that winter and spring precipitation in SC is less than normal from the 1960s to the start of the 1970s and from the end of the 1990s to the present.Most of rainfall anomalies on the whole regional scale of SC is well in phase during winter and spring,and the frequency of persistent drought is higher than that of persistent flood.Seasonal variations of moisture transport differences of SC between persistent drought and flood events are observed:the differences in winter are characterized by moisture transport from Bay of Bangle(BOB)and South China Sea(SCS),while differences in spring are characterized by that from SCS and North China(NC).There are two types of Ni o3.4 sea surface temperature anomaly(SSTA)related to persistent winter and spring drought(flood)events in SC,which are positive SSTA next to Ni o4(Ni o3)and negative SSTA next to Ni o3(Ni o4).Moreover,the variations of moisture transport from BOB and SC have important effects on persistent drought/flood in SC when the Ni o3.4 index is in the positive phase,while those from western North Pacific(WNP)-SC in winter and those from Philippine Sea(PHS)-SC and NC in spring primarily contribute to persistent drought/flood events in SC when the Ni o3.4 index is in the negative phase,and these stronger(weaker)moisture transports are observed in persistent flood(drought)during winter and spring regardless of the Ni o3.4 index.In conclusion,with the correlation between variations and distributions of Ni o3.4 SSTA and persistent drought/flood events in SC,moisture transport is responsible for the formation of precipitation anomalies.In addition,the moisture transport from SCS is most significantly correlated with persistent drought/flood events during winter and spring.
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| 关 键 词： | interannual variability EEOF analysis winter and spring precipitation moisture transport sea surface temperature anomaly |
| 收稿时间： | 2012/7/31 0:00:00 |
| 修稿时间： | 2013/10/15 0:00:00 |
INTERANNUAL VARIABILITY OF WINTER AND SPRING PRECIPITATION IN SOUTH CHINA AND ITS RELATION TO MOISTURE TRANSPORT |
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| WU Wei,WEN Zhi-ping,CHEN Yun-guang and CUI Shao-ping.INTERANNUAL VARIABILITY OF WINTER AND SPRING PRECIPITATION IN SOUTH CHINA AND ITS RELATION TO MOISTURE TRANSPORT[J].Journal of Tropical Meteorology,2013,19(4):322-330. |
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| Authors: | WU Wei WEN Zhi-ping CHEN Yun-guang and CUI Shao-ping |
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| Institution: | Bureau of Meteorology, Huizhou 516003 China;Research Center for Monsoon and Environment and Department of Atmospheric Sciences, Sun Yat-sen University, Guangzhou 510275 China;Research Center for Monsoon and Environment and Department of Atmospheric Sciences, Sun Yat-sen University, Guangzhou 510275 China;Bureau of Meteorology, Huizhou 516003 China;Bureau of Meteorology, Huizhou 516003 China |
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| Abstract: | The interannual variability of winter and spring precipitation in South China (SC) and its relation to moisture transport are investigated by using the monthly precipitation data of NMIC, NCEP reanalysis datasets and NOAA ERSST analysis datasets from 1960 to 2008. The results show that winter and spring precipitation in SC is less than normal from the 1960s to the start of the 1970s and from the end of the 1990s to the present. Most of rainfall anomalies on the whole regional scale of SC is well in phase during winter and spring, and the frequency of persistent drought is higher than that of persistent flood. Seasonal variations of moisture transport differences of SC between persistent drought and flood events are observed: the differences in winter are characterized by moisture transport from Bay of Bangle (BOB) and South China Sea (SCS), while differences in spring are characterized by that from SCS and North China (NC). There are two types of Niño3.4 sea surface temperature anomaly (SSTA) related to persistent winter and spring drought (flood) events in SC, which are positive SSTA next to Niño4 (Niño3) and negative SSTA next to Niño3 (Niño4). Moreover, the variations of moisture transport from BOB and SC have important effects on persistent drought/flood in SC when the Niño3.4 index is in the positive phase, while those from western North Pacific (WNP)-SC in winter and those from Philippine Sea (PHS)-SC and NC in spring primarily contribute to persistent drought/flood events in SC when the Niño3.4 index is in the negative phase, and these stronger (weaker) moisture transports are observed in persistent flood (drought) during winter and spring regardless of the Niño3.4 index. In conclusion, with the correlation between variations and distributions of Niño3.4 SSTA and persistent drought/flood events in SC, moisture transport is responsible for the formation of precipitation anomalies. In addition, the moisture transport from SCS is most significantly correlated with persistent drought/flood events during winter and spring. |
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| Keywords: | interannual variability EEOF analysis winter and spring precipitation moisture transport sea surface temperature anomaly |
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