Vol.27, NO.4, 2016
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Article Navigation >  Journal of Applied Meteorological Science  > 2016  >  27(4): 445-453
Jiang Xiaoling, Wang Donghai, Yin Jinfang, et al. Characteristics of tropopause height over China during East Asian summer monsoon. J Appl Meteor Sci, 2016, 27(4): 445-453. DOI:  10.11898/1001-7313.20160407.
Citation: Jiang Xiaoling, Wang Donghai, Yin Jinfang, et al. Characteristics of tropopause height over China during East Asian summer monsoon. J Appl Meteor Sci, 2016, 27(4): 445-453. DOI:  10.11898/1001-7313.20160407.
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Characteristics of Tropopause Height over China During East Asian Summer Monsoon

DOI: 10.11898/1001-7313.20160407
  • 1.

    State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081

  • 2.

    School of Atmospheric Sciences, Sun Yat-Sen University, Zhuhai 519082

  • Received Date: 2016-01-23
  • Rev Recd Date: 2016-06-13
  • Publish Date: 2016-07-31
    Abstract
  • Tropopause, as a transition layer between the troposphere and stratosphere, plays an important role on the regional and global climate and weather. Influenced by the Tibetan Plateau and monsoon, tropopause over China can even affect the global weather and climate, especially by changing aerosol distribution. Focusing on characteristics of tropopause height, 3 different sub-regions are defined in China during the East Asian summer monsoon, using high vertical resolution sounding data from year 2008 to 2014 collected by the network of L-band sounder. Results are shown as follows. Tropopause height increases with decreasing latitudes. The region with high tropopause moves northward with the maximum locating over the south of the Tibetan Plateau and the region to the southeast of the Plateau after the summer monsoon breaking. The region with large southward and eastward gradient of tropopause height moves from 30°-40°N to 40°-50°N after the summer monsoon break. There is little latitudinal difference in tropopause height over all the three sub-regions, indicating that the topography has little influence. However, tropopause height changes greatly after summer monsoon breaking: In northeast China and central-east China, the tropopause increases and in south China it slightly decreases. Influenced by the surface heat and vertical velocity, the temperature increases in the troposphere and decreases in the troposphere-stratosphere transition layer, which results in an increasing vertical temperature gradient after the summer monsoon breaking over the northeast and central-east China, resulting in higher tropopause. For northeast China, the temperature profile shows double peaks before the monsoon breaking, which is easy to form double tropopauses with a low first tropopause. In south China the temperature increases through the whole atmosphere after the summer monsoon breaking, generating slightly decreased tropopause. Limited by the coarse temporal resolution, more temporal characteristics such as daily changes cannot be studied. Further research should combine various datasets such as satellite to get a comprehensive analysis on the tropopause behavior over the mainland China.
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  • Fig. 1  Location of L-band radiosonde stations

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    Fig. 2  Sounding profiles of Sanya at 2000 BT 1 May 2014

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    Fig. 3  The mean tropopause height of different stages

    (a) tropopause height before summer monsoon break, (b) tropopause height after summer monsoon break, (c) increments after summer monsoon break

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    Fig. 4  Southward and eastward gradients of tropopause height of different stages

    (a) southward gradient before summer monsoon break, (b) southward gradient after summer monsoon break, (c) eastward gradient before summer monsoon break, (d) eastward gradient after summer monsoon break

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    Fig. 5  The mean tropopause height above different regions before and after summer monsoon break

    (a) northeast China, (b) central-east China, (c) southern China

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    Fig. 6  The mean temperature profile before and after summer monsoon break

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    Fig. 7  Annual cycle of the mean temperature (the contour, unit:℃) and vertical velocity (the shaded) of different regions

    (a) northeast China, (b) central-east China, (c) southern China

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    Table  1  Tropopause height over northeast China, central-east China and southern China

    区域 平均
    纬度    		 平均海拔
    高度/m    		 夏季风爆发前
    平均对流层顶
    高度/km    		 夏季风爆发后
    平均对流层顶
    高度/km    		 夏季风爆发前
    对流层顶高度
    标准差/km    		 夏季风爆发后
    对流层顶高度
    标准差/km
    东北部 41.0°N 955.2 10.15 14.00 0.777 1.517
    中东部 30.5°N 610.5 15.27 16.45 0.776 0.231
    南部 23.5°N 427.3 16.72 16.39 0.226 0.276
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    • Received : 2016-01-23
    • Accepted : 2016-06-13
    • Published : 2016-07-31
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