南海及周边地区TBB年及以上时间尺度振荡特征诊断研究  

DIAGNOSTIC STUDY OF OSCILLATION CHARACTERISTICS OF TBB ON ANNUAL AND LONGER TIME SCIALES IN THE SOUTH CHINA SEA AND SURROUNDING REGIONS

作　　者：梁建茵[1] 李春晖[1] 吴尚森[1] 

机构地区：[1]中国气象局广州热带海洋气象研究所,广东广州510080

出　　处：《热带气象学报》2003年第B09期1-11,共11页Journal of Tropical Meteorology

基　　金：国家自然科学基金重大研究计划项目90211010资助

摘　　要：应用小波变换方法，对1980～1997年逐日TBB资料进行分析，发现南海地区TBB年时间尺度(约6～15个月)和年际时间尺度(2～5年)变化显著。年时间尺度变化，在纬向上东传特征明显，在经向上具有赤道反对称的分布特征。南海地区TBB年时间尺度变化振幅与东太平洋海温异常之间存在调制作用。TBB年际时间尺度变化具有lO年际变化特征，1980年代年际时间尺度变化显著，1990年代明显减弱。该时间尺度变化与Nino3区海温异常有非常显著的关系，El Nino期间，南海地区TBB较高，对流相对较弱；La Nina期间，南海地区TBB较低，对流较强，表明南海地区大气环流对太平洋海温异常有明显的响应。With the wavelet transform technique,the day-to-day TBB datea for 1980~1997 are used in our diagnostic study to find that TBB variations are significant on the annual(about 6~15 months) and interannual time scales(2~5 years) in the South China Sea.For the former scale,the eastward propagation is obvious in the zonal direction while the distribution is equatorial anti-symmetric in the meridional direction.For TBB in the region of South China Sea,the amplitude of the annual time scale adjusts each other with the sea surface temperature anomalies (SSTA) in the eastern Pacific.The 10-year variations are the main characteristics of the interannual time scale of TBB,being much more significant in the 1980抯 than in the 1990抯.The time scale is much correlated with the SSTA in Nio 3 region——the South China Sea TBB is higher and convection weaker during the El Nio episode than during the La Nio one,suggesting obvious response of the general circulation in the South China Sea TBB to the SSTA in the Pacific Ocean.

关 键 词：TBB 小波变换 年时间尺度 年际时间尺度 

分 类 号：P425.42[天文地球—大气科学及气象学]