Plateau Meteorology

Plateau Meteorology >

2015 , Vol. 34 >Issue 5: 1191 - 1203

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00112

Analysis on Climatological Characteristics of Deep and Shallow Precipitation Cloud in Summer over Qinghai-Xizang Plateau

  • PAN Xiao ,
  • FU Yunfei
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  • School of Earth and Space Sciences, University of Scienceand Technology of China, Hefei 230026, China

Received date: 2014-03-13

  Online published: 2015-10-28

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Abstract

Climatological characteristics of the deep (strong deep convection and weak deep convection), shallow precipitat ionincluding their horizontal distribution, vertical structures, infrared signal characteristics, the diurnal variation and meridional movement of the precipitation mentioned above in the Plateau (QX) are investigated based on combining measurements of the tropical rainfall measuring mission (TRMM) precipitation radar (PR) and visible and infrared scanner (VIRS) from 1998 to 2007.The results show that the precipitation over QX is mainly in the form of week deep convection, which occupies 67.8% followed by the form of shallow precipitation with 26.4% and the strong deep convection with 5.8%.The average rain rates of deep precipitation for different cloud infrared radiant temperature all experience an increasing-reducing process from the storm top altitude to the ground level, while the shallow precipitation only has anincreasing process.Both the precipitation frequency peaks forstrong deep convection and weak deep convection appear at 16:00(local time, hereafter the same).While the precipitation intensities of which reach their peak at 13:00 and 18:00, respectively.Moreover, the strong deep convection has a secondary peak at 00:00.For the shallow precipitation, the precipitation frequency and intensity peaks both appear at 20:00, having the characteristicof night rain.The diurnal variation curves of radiant temperatureof deep and shallow precipitation are similar to each other, as a result, their minimaappear around 19:00.It is obvious that the strong deep convection and weak deep convection have the characteristics of eastward movement, and the week deep convection is more obvious.The shallow precipitation don' t have significant meridional propagation characteristics.

Key words： The Qinghai-Xizang P; Precipitation cloud; Infrared radiation t; Climatological chara; Diurnal variation

Cite this article

PAN Xiao , FU Yunfei . Analysis on Climatological Characteristics of Deep and Shallow Precipitation Cloud in Summer over Qinghai-Xizang Plateau[J]. Plateau Meteorology, 2015 , 34(5) : 1191 -1203 . DOI: 10.7522/j.issn.1000-0534.2014.00112

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