Plateau Meteorology

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2018 , Vol. 37 >Issue 1: 148 - 157

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00042

The Northwest Arid Areas in Summer Sunny Day, Cloudy Day Boundary Layer Structure and Land Surface Process Comparison Analysis

  • DU Yibo ,
  • ZHANG Qiang ,
  • WANG Kaijia ,
  • ZHANG Hongli
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  • college of Atmospheric science, Lanzhou University, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province Lanzhou 730030, Gansu, China;Key Open Laboratory of Arid Climatic Change and Disaster Reduction of China Meteorological Administration, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, Gansu, China

Received date: 2017-01-03

  Online published: 2018-02-28

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Abstract

Based on the sounding data of Dunhuang field observation in the summer of 2006, the structure of the atmospheric boundary layer on the sunny and cloudy days in the desert area of Northwest China had been studied. In addition, the corresponding land surface processes were investigated as well. Conclusions were drawn as follows:The convective boundary layer and the stable boundary layer on the sunny and cloudy days of northwest desert are more developed than those in central and eastern of China. In contrast, the boundary layer of sunny days is very different from that of the cloudy days in the structure and land surface processes, the height of convective boundary layer is up to 3.5 km in sunny days, while the height of the stable boundary layer is about 1 km, The maximum daily height of cloudy days for the convective and stable boundary layer is about 2.5 km and 0.2 km respectively. In addition to the boundary layer height, the specific humidity of northwest desert on cloudy day and sunny day shares the different characteristics. Sunny specific humidity with height range is greater than the cloudy day, the cloudy day starts from the ground surface up to 200 m, appearing the weaker counter humidity Phenomenon, but sunny days do not appear the phenomenon. The difference between the boundary layers are mainly caused by the thermal and dynamic factors on sunny and cloudy days. First of all, in different background weather, the solar radiation and the heat flux conversion rate lead the heat convection to be different, the solar radiation and sensible heat flux of the sunny days are stronger and greater than that of cloudy days; Secondly, the speed of the near ground level wind in sunny days is higher than that of cloudy days, This dynamic action in turbulent form also provides a certain dynamic background for the development of boundary layer height in sunny days, which is greater than that of cloudy days. The convective boundary layer is greatly affected by land surface thermodynamic factors in the early stage of the development, without the limitation of the stable boundary layer, it will develop rapidly. In addition, the temporal development in the diurnal variation of the net radiation, surface temperature and sensible heat flux exist a hysteresis quality, it is related to the transformation and transmission of energy.

Key words： The northwest arid a; atmospheric boundary; sunny cloudy; the road surface pro

Cite this article

DU Yibo , ZHANG Qiang , WANG Kaijia , ZHANG Hongli . The Northwest Arid Areas in Summer Sunny Day, Cloudy Day Boundary Layer Structure and Land Surface Process Comparison Analysis[J]. Plateau Meteorology, 2018 , 37(1) : 148 -157 . DOI: 10.7522/j.issn.1000-0534.2017.00042

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