ABRUPT CHANGES OF THE WESTERN PACIFIC SUBTROPICAL HIGH AND ITS INTERANNUAL VARIATION DURING LATE SPRING AND EARLY SUMMER

SHU Ting-fei; LUO Hui-bang

Abstract:

The 500-hPa geopotential height data used in this paper are from NCEP/NCAR data set for the period from 1979 to 1996 (from March to July). Using pentad average, we define the intensity, westernmost ridge point and mean latitude of the subtropical high ridge. Then the wavelet transform and EOF analysis are performed. It is found that there mainly exist three interseasonal abrupt change processes, which correspond to the onset time of the South China Sea Summer Monsoon (SCSSM), the beginning and the end of the Mei-yu respectively. The interannual variation of the subtropical high in late spring and early summer presents quasi-4-year and 8-year periods.

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SHU Ting-fei, LUO Hui-bang. ABRUPT CHANGES OF THE WESTERN PACIFIC SUBTROPICAL HIGH AND ITS INTERANNUAL VARIATION DURING LATE SPRING AND EARLY SUMMER [J]. Journal of Tropical Meteorology, 2003, 9(1): 31-40.

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ABRUPT CHANGES OF THE WESTERN PACIFIC SUBTROPICAL HIGH AND ITS INTERANNUAL VARIATION DURING LATE SPRING AND EARLY SUMMER

The Environmental Science and Engineering School, Zhongshan University

Abstract: The 500-hPa geopotential height data used in this paper are from NCEP/NCAR data set for the period from 1979 to 1996 (from March to July). Using pentad average, we define the intensity, westernmost ridge point and mean latitude of the subtropical high ridge. Then the wavelet transform and EOF analysis are performed. It is found that there mainly exist three interseasonal abrupt change processes, which correspond to the onset time of the South China Sea Summer Monsoon (SCSSM), the beginning and the end of the Mei-yu respectively. The interannual variation of the subtropical high in late spring and early summer presents quasi-4-year and 8-year periods.

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ABRUPT CHANGES OF THE WESTERN PACIFIC SUBTROPICAL HIGH AND ITS INTERANNUAL VARIATION DURING LATE SPRING AND EARLY SUMMER

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