| 用南海西沙站观测资料诊断研究南海季风季节内振荡 |
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| 引用本文： | 袁金南,梁建茵.用南海西沙站观测资料诊断研究南海季风季节内振荡[J].海洋学报,2006,28(1):18-25. |
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| 作者姓名： | 袁金南 梁建茵 |
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| 作者单位： | 中国气象局广州热带海洋气象研究所, 广东广州 510080 |
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| 基金项目： | 科技部社会公益研究专项“南海夏季风活动的监测及服务研究”(2002DIB10053) |
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| 摘 要： | 应用Lanczos滤波和小波变换方法,对1958~2000年南海北部西沙站降水和1980~2001年850hPa风场观测资料进行分析,发现西沙站每日降水和850hPa风场都存在谱长度10~50d左右其峰值为10~20,30~50d的季节内振荡,降水和850hPa风场的季节内振荡都有明显的年变化.降水季节内振荡开始于5月中旬结束于10月中旬,与南海夏季风的爆发时间和终止时间一致.850hPa风场谱长度10~50d左右其峰值为10~20,30~50d的季节内振荡在一年中的大部分时间都存在.降水和850hPa风场季节内振荡的强弱年与南海夏季风的强弱年并不一致.研究表明南海夏季风存在季节内振荡,而南海夏季风与季节内振荡的关系比较复杂.
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| 关 键 词： | 西沙站降水和850hPa风场 Lanczos滤波和小波分析 季风季节内振荡 |
| 文章编号： | 0253-4193（2006）01-0018-08 |
| 收稿时间： | 05 15 2005 12:00AM |
| 修稿时间： | 2005-05-152005-12-22 |
A diagnostic study of monsoon intraseasonal oscillation by using observational data of Xisha Station in the South China Sea |
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| YUAN Jing-nan and LIANG Jian-yin.A diagnostic study of monsoon intraseasonal oscillation by using observational data of Xisha Station in the South China Sea[J].Acta Oceanologica Sinica (in Chinese),2006,28(1):18-25. |
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| Authors: | YUAN Jing-nan and LIANG Jian-yin |
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| Institution: | Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080, China |
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| Abstract: | With the Lanczos filter and wavelet transform methods,the observational daily rainfall for the period 1958~2000 and winds at 850 hPa level for the period 1980~2001 of Xisha Station(16.5 N,112.2 E) in the north of South China Sea are used to study the intraseasonal variability of monsoon in the South China Sea.It is shown that the daily rainfall and winds at 850 hPa level have intraseasonal oscillation(ISO) which has spectral time scales about 10~50 d with two peak values of 10~20 and 30~50 d,and the ISO has a prom inentannual variation.The rainfall ISO starts in the middle of May and ends in the middle of October,which time is consistent with the time of summer monsoon onset and ending in the South China Sea.The 850 hPa winds ISO exists nearly in all the year round.And the strong and weakyears of the rainfall and 850 hP a winds ISO are inconsistent with the strong and weak years of summer monso on in the South China Sea.The study shows that the summer monsoon in the South China Sea has ISO,but the relationship between the summer monsoon and the ISO is complex. |
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| Keywords: | rainfall and 850 hPa winds of Xisha Station Lanczos filter and wavelet analysis monsoon ISO |
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