ZONALLY SYMMETRICAL EKMAN-CISK MECHANISM AND 30—60-DAY LOW FREQUENCY OSCILLATION NEAR THE EQUATOR  

作　　者：薛洪斌 钟中 薛峰 

机构地区：[1]Institute of Meteorology,PLA Science and Technology University,Nanjing 211101 [2]Department of Atmospheric Sciences,Nanjing University,Nanjing 210093 [3]LASG.Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029

出　　处：《Acta meteorologica Sinica》2002年第4期498-508,共11页

基　　金：This study was supported jointly by Chinese Academy of Sciences Key Project under Contract KZCX2-203 and National Natural Science Foundation of China under Grants 40125014 and 49805004.

摘　　要：Based on the baroclinic semi-geostrophic model,the effects of zonally symmetrical Ekman- CISK mechanism on the characteristics of 30—60-day low frequency oscillation(LFO)near the equator are investigated.It is found that the theoretical results are in good agreement with the observational features of LFO.Besides,the planetary-scale LFO with the period of 30—60 d could be triggered by the Ekman-CISK mechanism,and the growth rate of perturbation with wave number 1 is in order of O (10^(-6)s^(-1)).The zonal propagation of LFO and the corresponding longitudinal-height structure of physical quantities are also discussed in detail.Based on the baroclinic semi-geostrophic model,the effects of zonally symmetrical Ekman- CISK mechanism on the characteristics of 30—60-day low frequency oscillation(LFO)near the equator are investigated.It is found that the theoretical results are in good agreement with the observational features of LFO.Besides,the planetary-scale LFO with the period of 30—60 d could be triggered by the Ekman-CISK mechanism,and the growth rate of perturbation with wave number 1 is in order of O (10^(-6)s^(-1)).The zonal propagation of LFO and the corresponding longitudinal-height structure of physical quantities are also discussed in detail.

关 键 词：Ekman-CISK mechanism 30-60-day low frequency oscillation(LFO) semigeostrophic model 

分 类 号：P534[天文地球—古生物学与地层学]