Improvement of planetary boundary layer height and variation of dust devil emission in desert areas
GAO Ya-wen1, HAN Yong-xiang1, LI Jia-xin1, LU Zheng-qi1, QIN Pei1, LIU Wei-jia1, LIANG Yun2
1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China; 2. Electric Power Research Institude, Electric Power of Henan2, Zhengzhou 450000, China
Abstract：On the basis of the YSU (Yonsei University) boundary layer parameterization scheme, an empirical revised boundary layer RYSU scheme was adopted in this paper, whose simulated boundary layer height was consistent with the observation. Meanwhile, the dust devil emission scheme was applied to obtain the spatial and temporal distribution of the summer dust devil's dust emission in Tengger Desert in 2019. The results revealed that from 08:00 to 18:00, the dust devil's instantaneous dust emission and dust range simulated by the RYSU scheme were higher than those of the YSU scheme. The time when the dust emission and the range of the former was the largest was 15:00, which was one hour later than the latter. It was closer to the occurrence frequency of the dust devil observed in the Tengger Desert. Furthermore, the total daily dust devil emission in the study area from June to August with the RYSU scheme was almost three times higher than with the YSU scheme, and the maximum instantaneous dust devil emission estimated with the RYSU scheme was closer to the value calculated with the maximum height of the observed boundary layer than with the YSU scheme.
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