Journal of Marine Sciences ›› 2015, Vol. 33 ›› Issue (4): 37-42.DOI: 10.3969/j.issn.1001-909X.2015.04.004

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Diurnal variation of typhoon precipitation in Northwest Pacific

RUAN Zhen-xin1,2   

  1. 1. State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China;
    2. The Second Institute of Oceanography, SOA, Hangzhou 310012, China
  • Received:2015-07-06 Revised:2015-09-07 Online:2015-12-15 Published:2022-11-28

Abstract: Using 15 year's TRMM-measured precipitation data, the diurnal variations of non-typhoon and typhoon precipitation in Northwest Pacific were studied. The diurnal signal of non-typhoon precipitation reaches its maximum at 06∶00, with a smaller maximum occurring around 15∶00. The typhoon precipitation within 500 km radius from the typhoon center shows a clear diurnal signal, and reaches its maximum around 03∶00~09∶00, and both of its mean and diurnal variation are larger than those of non-typhoon precipitation. Meanwhile, both the numbers of typhoon intensification and rapid intensification during 03∶00~08∶00 are bigger than other periods. From the satellite images of typhoon ‘HaiShen’, the area of extreme convection cloud is much larger in 06∶00 than in 18∶00, which is consistent with the diurnal variation pattern of precipitation.

Key words: typhoon, precipitation, diurnal variation

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