用南海西沙站观测资料诊断研究南海季风季节内振荡

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

中国气象局广州热带海洋气象研究所, 广东广州 510080

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)

计量
- 文章访问数: 745
- HTML全文浏览量: 18
- PDF下载量: 847
- 被引次数: 0
出版历程
- 收稿日期: 2005-05-15
- 修回日期: 2005-12-22

A diagnostic study of monsoon intraseasonal oscillation by using observational data of Xisha Station in the South China Sea

Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080, China

摘要

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.
- 西沙站降水和850hPa风场 /
- Lanczos滤波和小波分析 /
- 季风季节内振荡
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.
- rainf all and 850 hPa winds of Xisha Station /
- Lanczos filter and wavelet analysis /
- monsoon ISO

HTML全文

参考文献(23)

MADDEN R D,JULIAN P.Detection of a 40-50 day oscillation in the zonal wind in the tropical Pacific[J].J Atmos Sci,1971,28:702-708.

MADDEN R D,JULIAN P.Description of global scale circulation cells in the tropics with 40-50 day period[J].J Atmos Sci,1972,29:1 109-1 123.

KRISHNAMURTI T N,BHALME H N.Oscillation of a monsoon system:Part Ⅰ.Observational aspects[J].J Atmos Sci,1976,33:1 937-1 954.

KRISHNAMURTI T N,SUBRAHMANYAM D.The 30-50 day mode at 850 mb during MONEX[J].J Atmos Sci,1982,39:2 088-2 095.

YASUNARI T.Cloudiness fluctuations associated with the Northern Hemisphere summer monsoon[J].J Meteor Soc Japan,1979,57:227-242.

YASUNARI T.A quasi-stationary appearance of 30-40 day period in the cloudiness fluctuations during the summer monsoon over India[J].J Meteor Soc Japan,1980,58:225-229.

LAU K M,CHAN P H.Aspects of the 40-50 day oscillation during the northern winter as inferred from outgoing longwave radiation[J].Mon Wea Rev,1985,113:1 889-1 909.

LAU K M,CHAN P H.Aspects of the 40-50 day oscillation during the northern summer as inferred from outgoing longwave radiation[J].Mon Wea Rev,1986,114:1 354-1 367.

WEICKMANN K M,LUSSKY G R,KUTZBACH J E.Intraseasonal(30——60 day) fluctuations of outgoing longwave radiation and 250mb stream function during northern winter[J].Mon Wea Rev,1985,113:941-961.

MURAKAMI T,CHEN L X,XIE A,et al.Eastward propagation of 30-60 day perturbations as revealed from outgoing longwave radiation data[J].J Atmos Sci,1986,43:961-971.

MURAKAMI T,CHEN L X,XIE A.Relationship among seasonal cycles,low-frequency oscillations,and transient disturbances as revealed from outgoing longwave radiation data[J].Mon Wea Rev,1986,114:1 456-1 465.

ANDERSON J R,ROSEN R D.The latitude-height structure of 40-50 day variations in atmospheric and angular momentum[J].J Atmos Sci,1983,40:1 584-1 591.

张可苏.40-50天的纬向基流低频振荡及其失稳效应[J].大气科学,1987,11:227-236.

李崇银.大气中的季节内振荡[J].大气科学,1990,14:32-45.

李崇银.南亚季风槽(脊)和热带气旋活动与移动性CISK波[J].中国科学(B),1985,668-675.

李崇银.频繁的强东亚大槽活动与El Nino发生[J].中国科学(B),1988,667-674.

LAU K M,PENG L.Origin of low-frequency(intraseasonal) oscillations in the tropical atmosphere:Part Ⅰ.Basic theory[J].J Atmos Sci,1987,44:950-972.

宋焱云,谢安,毛江玉,叶谦.南海夏季风暴发过程的低频特征[J].海洋学报,2000,22(2):35-40.

LANCZOS C.Applied Analysis[M].Prentice-Hall,1956.539.

JONES C,WALISER D E,GAUTIER C.The influence of the Madden Julian oscillation on ocean surface heat fluxes and sea surface temperature[J].J Climate,1998,11:1 057-1 072.

DUCHON C E.Lanczos filtering in one and two dimensions[J].J Appl Meteor,1979,18:1 016-1 022.

TORRENCE C,GILBERT P C.A practical guide to wavelet analysis[J].Bulletin of American Meteorological Society,1998,79:61-78.

吴尚森,梁建茵,李春晖.南海夏季风强度与我国汛期降水的关系[J].热带气象学报,2003,19(增刊):25-36.

施引文献

资源附件(0)

访问统计

计量

文章访问数: 745
HTML全文浏览量: 18
PDF下载量: 847
被引次数: 0

姓名
邮箱
手机号码
标题
留言内容
验证码

留言板