On the interannual variation in spring atmospheric inter-hemispheric oscillation linked to synchronous climate in China  

作　　者：Chuhan Lu Zhaoyong Guan 

机构地区：[1]Key Laboratory of Meteorological Disaster of Ministry of Education and College of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China

出　　处：《Progress in Natural Science:Materials International》2009年第9期1125-1131,共7页自然科学进展·国际材料（英文版）

基　　金：supported jointly by the Project of the National Key Technology R&D Program (Grant No.2007BAC29B02);National Natural Science Foundation of China (Grant No. 40675025);Jiangsu Creative Engineering of Postgraduate Fostering (Grant No.CX08B_017Z)

摘　　要：Based on NCEP/NCAR monthly mean reanalysis data and surface observations of Chinese stations, inter-hemispheric oscillations （IHO） of spring atmospheric mass on an interannual basis in conjunction with the linkage to the synchronous climate over China are studied. Results suggest that the spring IHO exhibits a significant seesaw pattern for air mass at bi-hemispheric mid-high latitudes, with a consistent vertical circulation structure. The EOF decomposition of zonally mean surface pressures without signals of Arctic Oscillation （AO） and Antarctic Oscillation （AAO） indicates that the EOF1 IHO feature is remarkable, with the corresponding time coefficients correlated with the spring IHO index （Iino） at 0.93; the spring IHO bears a close relation to the synchronous climate in China, showing the surface pressure, temperature and relative humidity over the country to be in good correlation with IIHO; the spring duststorms in Qinghai, Gansu, Shaanxi and Inner Mongolia have bearing on IHO. Positive-phase IIHO promotes the strengthening of the Siberian high, during which zonal winds between 60°E and 150°W show a longitudinal teleconnection structure extending from the Arctic to Antarctica, leading to positive westerly wind anomalies over Asia, affecting the spring climate of China.Based on NCEP/NCAR monthly mean reanalysis data and surface observations of Chinese stations, inter-hemispheric oscillations (IHO) of spring atmospheric mass on an interannual basis in conjunction with the linkage to the synchronous climate over China are studied. Results suggest that the spring IHO exhibits a significant seesaw pattern for air mass at bi-hemispheric mid-high latitudes, with a consistent vertical circulation structure. The EOF decomposition of zonally mean surface pressures without signals of Arctic Oscillation (AO) and Antarctic Oscillation (AAO) indicates that the EOF1 IHO feature is remarkable, with the corresponding time coeficients correlated with the spring IHO index (IIHO) at 0.93; the spring IHO bears a close relation to the synchronous climate in China, showing the surface pressure, temperature and relative humidity over the country to be in good correlation with IIHO; the spring duststorms in Qinghai, Gansu, Shaanxi and Inner Mongolia have bearing on IHO. Positive-phase IIHO promotes the strengthening of the Siberian high, during which zonal winds between 60°E and 150°W show a longitudinal teleconnection structure extending from the Arctic to Antarctica, leading to positive westerly wind anomalies over Asia, affecting the spring climate of China.

关 键 词：Air mass Inter-hemispheric oscillation （IHO） Spring climate China 

分 类 号：P467[天文地球—大气科学及气象学] X823[环境科学与工程—环境工程]