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Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (3): 127-138.DOI: 10.7522/j.issn.1000-694X.2022.00026

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Influence of dust aerosol on land surface diurnal temperature range over East Asia Simulated with the WRF-Chem model

Siyu Chen(), Yawen Guan, Dan Zhao, Gaotong Lou, Yu Chen   

  1. College of Atmospheric Sciences / Ministry of Education Key Laboratory for Semi-Arid Climate Change,Lanzhou University,Lanzhou 730000,China
  • Received:2021-11-25 Revised:2022-03-24 Online:2022-05-20 Published:2022-06-01

Abstract:

As an important synoptic and climate index, diurnal temperature range (DTR) reflects the extreme temperature difference between day and night. Compared with average temperature, DTR is more sensitive to changes in surface radiation budget and has important reference value for environmental changes and climate anomalies. The physical process of dust aerosol and its climatic effect are important factors affecting the lithosphere-atmosphere-ocean system, but the influence of dust climate effects on DTR has not been studied. The study reveals the climatic impact of dust aerosol on DTR over East Asia during 2002-2005 based on the WRF-Chem model (Weather Research and Forecasting coupled with Chemistry). The results show that the WRF-Chem model can well reproduce the spatial-temporal distributions of meteorological field and dust aerosol over East Asia. The dust climate effect dominated by direct radiative forcing leads to the decrease of DTR in most parts of East Asia continent. During daytime, the direct radiative effect induced by dust heats the atmosphere and cools the surface, contributing to net surface radiation-cutting, thus further the decrease of the maximum Temperature and DTR. In contrast, an opposite variation tendency of DTR, primarily regulated by dust indirect effect, occurred over the Tibet Plateau and the northeast of China due to reduction of snow cover and liquid water path, respectively.

Key words: dust aerosol over East Asia, WRF-Chem model, dust mass budget, dust transport, direct radiative forcing induced by dust, dust climate effect

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