| The influence of 30~60 d oscillation on the development of the South China Sea summer monsoon |
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| 作者姓名： | WEN Zhiping HE Haiyan HUANG Ronghui |
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| 作者单位： | [1]ResearchCenterforMonsoonandEnvironment／DepartmentofAtmosphericScience,ZhongshanUniversity,Guangzhou510275,China [2]InstituteofAtmosphericPhysics,ChineseAcademyofSciences,Beijing100029,China |
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| 基金项目： | 国家自然科学基金，the National Key Programme for Developing Basic Sciences Project (Part 1) of China under contract |
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| 摘 要： | Using the National Center for Enviromental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis data and NOAA satellite-obser ved outgoing long-wave radiation (OLR) data, the development of the South China Sea (SCS) summer monsoon and intraseasonal (30-60 d) oscillation (ISO) have been examined. The results show that there exists obvious interannual variability of intraseasonal oscillaiton. Using the 16 a time series of filtered OLR averaged over the SCS, an index is defined to define ““onset events““ over the SCS on the ISO time scales. Of the 16 a examined here, 10 shows a strong ISO signal in the onset of monsoon convection over the SCS. In these cases, the ISO initially suppresses the seasonal development of southwesterly and cyclonic circulation over the SCS before the ISO onset. As the ISO propagates northeastward, the low frequency cyclonic circulation anomaly occurs in the SCS and the low frequency southwesterly wind and convection over here dramatically intensify. The northeast progression of the ISO anomaleis plays a role in the initial suppression and then acceleration of the seasonal cycle of the SCS summer monsoon.
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| 关 键 词： | OLR SCS NCAR NCEP NOAA |
| 收稿时间： | 2004/3/11 0:00:00 |
| 修稿时间： | 2004/7/20 0:00:00 |
The influence of 30~60 d oscillation on the development of the South China Sea summer monsoon |
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| WEN Zhiping,HE Haiyan,HUANG Ronghui.The influence of 30~60 d oscillation on the development of the South China Sea summer monsoon[J].Acta Oceanologica Sinica,2004,23(4):569-579. |
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| Authors: | WEN Zhiping HE Haiyan and HUANG Ronghui |
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| Institution: | 1.Research Center for Monsoon and Environment/Department of Atmospheric Science, Zhongshan University, Guangzhou 510275, China2.Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Using the National Center for Enviromental Prediction/National Center for Atmospheric Research (NCEP/NCAR)reanalysis data and NOAA satellite-observed outgoing long-wave radiation (OLR) data, the development of theSouth China Sea (SCS) summer monsoon and intraseasonal (30~60 d) oscillation (ISO) have been examined. Theresults show that there exists obvious interannual variability of intraseasonal oscillaiton. Using the 16 a time series offiltered OLR averaged over the SCS, an index is defined to define onset events over the SCS on the ISO time scales.Of the 16 a examined here, 10 shows a strong ISO signal in the onset of monsoon convection over the SCS. In thesecases, the ISO initially suppresses the seasonal development of southwesterly and cyclonic circulation over the SCSbefore the ISO onset. As the ISO propagates northeastward, the low frequency cyclonic circulation anomaly occursin the SCS and the low frequency southwesterly wind and convection over here dramatically intensify. The northeastprogression of the ISO anomaleis plays a role in the initial suppression and then acceleration of the seasonal cycle ofthe SCS summer monsoon. |
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| Keywords: | influence intraseasonal oscillation SCS summer monsoon |
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