TROPICAL GEOGRAPHY ›› 2015, Vol. 35 ›› Issue (3): 334-342.

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Precipitation Structural Characteristics in Different Stages of Typhoon ‘Nanmadol’ in 2011

ZHONG Wenting1,2,BAI Aijuan1,CAI Qinbo3   

  1. (1.School of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,China;2.Haikou Meteorological Bureau, Haikou 571100,China;3.Hainan Meteorological Observatory,Haikou 510203,China)
  • Online:2015-06-05 Published:2015-06-05

Abstract:

Based on the TRMM satellite data and NCAR/NCEP reanalysis data, this paper analyses the variations of precipitation characteristics of Typhoon ‘Nanmadol’ in 2011, especially its thermal and dynamic structures in its weakening phase after landing on the south part of Taiwan Island. The results show that: 1) The rainfall distribution of ‘Nanmadol’ is significantly asymmetric, and severe precipitation occurs at the eye-wall region, which mainly resulted from the convective cloud, but stratiform cloud contributes much to the total rainfall of typhoon than convective clouds. Within the four kinds of particles in the clouds, the content of cloud-water particles is the lowest, followed by ice-water, and the content of rain-water particles is the most than any others. Around the typhoon, precipitation mainly occurs in its southwest direction during the stage of infancy and weakening, but in the southeast direction in maturity stage with a more clear and complete structure. 2) The precipitation cloud of ‘Nanmadol’ is columnar in the vertical direction and can be extended up to about 10 km, while the heavy rainfall echo concentrates below the height of 5 km, especially at the level of 2-4 km. 3) After its landing, severe precipitation mainly occurs in its southwest direction, but in other orientations there is scattered and weak rainfall. The warm-moist core of typhoon inclines towards southwest with the height. At the same time the strong latent heat releases at the middle troposphere, which is about the height of 5 km. In one word, the air flows in the typhoon from the lower troposphere with strong convergence, and flows out it at the level of the tropopause with divergence in the unstable atmospheric stratification, which is benefit to the formation of heavy rainfall in the southwest part of typhoon center.

Key words: TRMM Satellite, Typhoon ‘Nanmadol’, precipitation structure