Advances in Earth Science ›› 2007, Vol. 22 ›› Issue (11): 1150-1159. doi: 10.11867/j.issn.1001-8166.2007.11.1150

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A Study on Atmospheric Thermal Boundary Layer Structure in Extremely Arid Desert and Gobi Region on the Clear Day in Summer

ZHANG Qiang 1, ZHAO Ying-dong 2, WANG Sheng 1, MA Fang 1   

  1. 1.Institute of Arid Meteorology, China Meteorological Administration Key Laboratory of Arid Climatic Change and Reducing Disaster, Lanzhou 730020,China;2.Gansu Province Bureau of Hydrology and Water Resource Survey, Lanzhou 730000,China
  • Received:2007-09-20 Revised:2007-10-20 Online:2007-11-10 Published:2007-11-10

ZHANG Qiang, ZHAO Ying-dong, WANG Sheng, MA Fang. A Study on Atmospheric Thermal Boundary Layer Structure in Extremely Arid Desert and Gobi Region on the Clear Day in Summer[J]. Advances in Earth Science, 2007, 22(11): 1150-1159.

Vertical structure characteristics of mainly physics factor such as potential temperature、wind speed and specific humidity etc., using field observation data in Dunhuang, Gansu Province, the diurnal rule of surface thermal and dynamical characteristics in surface layer is analyzed in the extremely arid desert and gobi region. the special thermal boundary layer structure in summer is found. In the nighttime, the lowest ground inversion layer exceeds the height of 900 m and maximum that reaches the 1 750 m. The residual layer can touch the height about the 4 000 m.The depth of the superadiabatic lapse layer for potential temperature and the depth of the mixed layer on it are 1 000 m and 3 700 m in the daytime, respectively, which are high. There is entrainment layer that the depth is more than 450m on the top of the mixed layer. The mixed layer develops rapidly when convective boundary layer product residual layer. The vertical profiles of wind speed and specific humidity confirm well the particular structure of atmospheric thermal boundary layer. Surface thermal and dynamical characteristics supply the physical support for the particular atmospheric thermal boundary layer structure.

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