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| Characteristics of persistent haze events and circulation analysis in Sichuan Basin in recent 36years |
| LUO Yu1,2, MA Zhen-feng2, ZHAO Peng-guo3, QING Qing-tao2, SUN Yu4, LIU Jia2, LI Xiao-Lan2, SUN Rui2 |
1. Institute of Plateau Meteorology, China Meteorological Administration, Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072, China;
2. Climate Center of Sichuan Province, Chengdu 610072, China;
3. College of Atmospheric Science, Chengdu University of Information Technology, Chengdu 610225, China;
4. Meteorological disaster prevention technology center of Sichuan Province, Chengdu 610072, China |
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Abstract Based on the statistical haze data over Sichuan Basin during 1981~2016, the climatic characteristics of spatial and temporal distribution of persistent haze days, which refer to the haze events lasting 3 or more days and the circulation of typical haze process are analyzed. The results show that the annual average days of persistent haze events in Sichuan from 1981 to 2016 showed an increasing trend, the percentage of continuous haze days to total haze days was consistent with the increasing trend of total haze days, the increase of total haze days was mainly caused by the increase of continuous haze events. The spatial distribution of persistent haze events of Sichuan Basin was heterogeneous, which was very similar to the distribution of the total haze daysand mainly concentrated in the northeastern Sichuan urban agglomeration, Chengdu Plain urban agglomeration and southern Sichuan urban agglomeration. The range of haze-prone areas increased in 1981~2010 and decreased significantly in 2011~2016. It is found that the Sichuan Basin is in the region of high (cold) high (low) pressure when more (less) years (periods) of continuous haze events occur. The Ural blocking high is weak (strong), the Siberian high is weak (strong), the trough in East Asia is weak (strong), the basin is convergent (divergent) to a certain extent, exists (does not exist) an obvious inversion structure and the vertical upward motion is weak (strong), these conditions are conducive to the accumulation of pollutant particles in the shallow boundary layer (conducive to the diffusion of pollutants), resulting in the maintenance (dissipation) of haze events.
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Received: 19 February 2019
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