Development of the Convective Boundary Layer Capping with a Thick Neutral Layer in Badanjilin: Observations and Simulations |
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| Authors: | HAN Bo LU Shihua and AO Yinhuan |
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| Institution: | Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, No. 320, Donggang West Road, Lanzhou 730000,Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, No. 320, Donggang West Road, Lanzhou 730000,Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, No. 320, Donggang West Road, Lanzhou 730000 |
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| Abstract: | In this study, the development of a convective boundary layer (CBL) in the Badanjilin region was investigated by comparing
the observation data of two cases. A deep neutral layer capped a CBL that occurred on 30 August 2009. This case was divided
into five sublayers from the surface to higher atmospheric elevations: surface layer, mixed layer, inversion layer, neutral
layer, and sub-inversion layer. The development process of the CBL was divided into three stages: S1, S2, and S3. This case
was quite different from the development of the three-layer CBL observed on 31 August 2009 because the mixed layer of the
five-layer CBL (CBL5) eroded the neutral layer during S2. The specific initial structure of the CBL5 was correlated to the
synoptic background of atmosphere during nighttime. The three-stage development process of the CBL5 was confirmed by six simulations
using National Center for Atmospheric Research (USA) large-eddy simulation (NCAR-LES), and some of its characteristics are
presented in detail. |
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| Keywords: | convective boundary layer neutral layer large-scale circulation large-eddy simulation |
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