Plateau Meteorology

Plateau Meteorology >

2015 , Vol. 34 >Issue 4: 991 - 1004

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00103

Fact and Simulation of Dust Aerosol Transported to Stratosphere during a Strong Dust Storm in South Xinjiang

  • ZHANG Jie ,
  • TIAN Wenshou ,
  • LONG Xiao ,
  • TIAN Hongying ,
  • HUANG Qian ,
  • XU Pingping ,
  • YANG Qin ,
  • ZHANG Jiankai
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  • Key Laboratory of Semi-Arid Climate Chang, Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China

Received date: 2014-01-03

  Online published: 2015-08-28

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Abstract

Using NCEP reanalysis data and satellite observations, together with a mesoscale chemical transport model(WRF-Chem), a dust event occurred in the Taklimakan desert, north of the Qinghai-Xizang Plateau on April 17, 2007 is analyzed in an attempt to understand the characteristics and mechanisms of dust aerosol transport from the surface to the upper troposphere and the lower stratosphere over Qinghai-Xizang Plateau and its vicinity. Differences in the transport of particles with different sizes are also discussed. The results indicate that: Vertical transport of dust aerosols is closely related to background horizontal winds. In the absence of the cloud microphysical processes, when a deep convergence zone of northerly and southerly winds forms over Qinghai-Xizang Plateau, the vertical motions resulted from the convergence could transport dust aerosols, originated from the Taklimakan desert, to the lower stratosphere with an evident inclined transport pathway. The result implies that the position of the dust reached the lower stratosphere may not collocate with the surface dust source. In addition, dust particles with different sizes present different transfer characteristics. Small dust particles can be transported to the stratosphere relative easily by upward motions, while particles with size larger than 8.0 μm could not be transported to the lower stratosphere due to strong deposition process. The results from a sensitivity experiment with decreased orography height show that the upward and southward transport of dust aerosols is depressed when orography height is decreased.

Key words： Stratosphere-troposp; Dust aerosols; The Qinghai-Xizang P; Numerical simulation

Cite this article

ZHANG Jie , TIAN Wenshou , LONG Xiao , TIAN Hongying , HUANG Qian , XU Pingping , YANG Qin , ZHANG Jiankai . Fact and Simulation of Dust Aerosol Transported to Stratosphere during a Strong Dust Storm in South Xinjiang[J]. Plateau Meteorology, 2015 , 34(4) : 991 -1004 . DOI: 10.7522/j.issn.1000-0534.2014.00103

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