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《Chinese Journal of Atmospheric Sciences》 2001-06
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Variations of the Western Pacific Subtropical High in Summer during the Last Hundred Years

Mu Qiaozhen, Wang Shaowu, Zhu Jinhong ,and Gong Daoyi (Department of Geophysics, Peking University, Beijing 100871)  
Firstly, correlation coefficients are calculated between the strength index (Is), the western limit index (Iw) and the northern limit index (IN) of the subtropical high (5TH) and the 500 hPa geopotential height set (provided by NCC) for the period of 1951~ 1998. Based on these correlation coefficients, some instructive points are selected in the 500 hPa geopotential height set by using which three STH indices I's, I'N and I'w are calculated. The correlation coefficients between , I's, I'N, I 'w are significant. Then the same analysis is carried out using NCEP 500 hPa geopotential height set, and the result is similar. It shows that using 500 hPa geopotential height set to calculate the three STH indices is practicable. So, the three STH indices are reconstructed back to the year of 1880 using the reconstructed 500 hPa geopotential height set from 1880 to 1950. After that, wavelet transformation is made to analyze the variabilities of Is, Iw and IN during 1880 and 1999, where by obvious 40.0-year-long-period oscillation of Is and IN, and 16.0-year-long-period oscillation of Iw are found. The inter-decadal oscillations of Is, Iw and IN are simultaneous.
【Fund】: 国家重点基础研究发展规划项目G199804091-2;; 国家自然科学基金资助项目49635190共同资助
【CateGory Index】: P433
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