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https://doi.org/10.5194/acp-2020-787
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-787
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  24 Sep 2020

24 Sep 2020

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This preprint is currently under review for the journal ACP.

Characteristics of the summer atmospheric boundary layer height over the Tibetan Plateau and influential factors

Junhui Che1,2,3 and Ping Zhao1 Junhui Che and Ping Zhao
  • 1State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, 100081, China
  • 2College of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing, 210044, China
  • 3Shandong Meteorological Service Center, Jinan, 250031, China

Abstract. Based on intensive sounding, surface sensible heat flux, solar radiation, and soil moisture observational datasets from the Third Tibetan Plateau Atmospheric Scientific Experiment and the routine meteorological operational sounding and total cloudiness datasets in the Tibetan Plateau (TP) for the period 2013–2015, we investigate the features of summer atmospheric boundary layer (ABL) over the TP and its major influential factors. It is found that the convective boundary layer (CBL) and the neutral boundary layer (NBL) show remarkable diurnal variations over the TP, while the stable boundary layer (SBL) diurnal variation is weak. In the early morning, the ABL height distribution is narrow, with a small west-east difference. The SBL accounts for 85 % of the TP ABL. At noon, there is a wide distribution in the ABL height up to 4000 m. The CBL accounts for 77 % of the TP ABL, with more than 50 % of the CBL height above 1900 m. The ABL height exhibits a large west-east difference, with a mean height above 2000 m in the western TP and around 1500 m in the eastern TP. In the late afternoon, the CBL and SBL dominate the western and eastern TP, respectively, resulting in a larger west-east difference of 1054.2 m between the western and eastern TP. The high ABL height in a cold environment over the western TP (relative to the plain areas) is similar to that in some extreme hot and arid areas such as Dunhuang and Taklimakan Deserts. For the western (eastern) TP, there is low (high) total cloud coverage, with large (small) solar radiation at the surface and dry (wet) soil. These features result in high (low) sensible heat flux and thus promotes (inhibits) the local ABL development.

Junhui Che and Ping Zhao

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Junhui Che and Ping Zhao

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Short summary
The important roles of the Tibetan Plateau (TP) atmospheric boundary layer (ABL) in climate, weather and air quality have long been recognized, but little is known about the TP ABL climatological features due to the scarce data in the western TP. We utilize the new sounding, boundary-layer, and soil observations from the Third Tibetan Plateau Atmospheric Scientific Experiment to investigate the features of the ABL height over the TP, compare the differences in the ABL height between the western.
The important roles of the Tibetan Plateau (TP) atmospheric boundary layer (ABL) in climate,...
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