Driving role of Siberian High's in the anomalous variations of winter PM2.5 in the Twain-Hu Basin
YAO Jing-yan1, BAI Yong-qing2, ZHAO Tian-liang1, XIONG Jie2, ZHOU Yue2, ZHU Yan3, SUN Xiao-yun1, ZHANG Ling1
1. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster, Nanjing University of Information Science and Technology, Nanjing 210044, China; 2. China Meteorological Administration Basin Heavy Rainfall Key Laboratory/Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research, Institute of Heavy Rain, China Meteorological Administration, Wuhan 430205, China; 3. Hubei Meteorological Service Center, Wuhan 430205, China
Abstract：This study explored the correlation and physical mechanisms between the Siberian High intensity (SHI) in the East Asian winter monsoon (EAWM) and the anomalous variations of wintertime PM2.5 in the Twain-Hu Basin with the statistical correlation analysis, atmospheric circulation diagnosis and numerical simulation, for which the PM2.5 concentration data observed in the Twain-Hu (Hunan-Hubei) basin of central China in January from 2015 to 2022, combined with the China high air pollutant (CHAP) data and ERA5 meteorological reanalysis data, were used. The results show that the interannual PM2.5 variations in the Twain-Hu Basin over the period from 2015 to 2022 were negatively correlated with the SHI (r = -0.82, P<0.05) when excluding the effect of anthropogenic emissions, and the PM2.5 reanalysis of January 2000~2019 also presented a significant negative correlation with the interannual variation of SHI (r = -0.77, P<0.05), revealing that the variations in SHI of the EAWM could modulate the interannual variations in wintertime PM2.5. Siberian High in the system of EAWM was a key factor influencing the atmospheric diffusivity for interannual anomalies of PM2.5 in the Twain-Hu Basin. In strong (weak) SHI winters, the latitudinal-type circulation in the middle and upper troposphere was weak (strong), the zonal westerly components at high altitude was weakened (enhanced), the East Asian trough was deepened (weakened). Anomalous northerly (southerly) in the middle and low levels were the favorable (unfavorable) with cold air southward advances, and enhancing (weakening) the ventilation coefficients in the Twain-Hu Basin for the anomalous regional PM2.5 changes. The FLEXPART-WRF simulation also verifies that the Siberian High regulated the local PM2.5 variations by altering the atmospheric diffusivity and local accumulations in the Twain-Hu Basin.
姚婧妍, 白永清, 赵天良, 熊洁, 周悦, 朱燕, 孙晓芸, 张玲. 西伯利亚高压对两湖盆地冬季PM2.5异常变化的驱动作用[J]. 中国环境科学, 2023, 43(7): 3312-3321.
YAO Jing-yan, BAI Yong-qing, ZHAO Tian-liang, XIONG Jie, ZHOU Yue, ZHU Yan, SUN Xiao-yun, ZHANG Ling. Driving role of Siberian High's in the anomalous variations of winter PM2.5 in the Twain-Hu Basin. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3312-3321.
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