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Influence of rainfall-induced diabatic heating on southern rainfall-northern haze over eastern China in early February 2023

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Science China Earth Sciences 2023年第11期66卷 2579-2593页

作者： Xiadong AN Wen CHEN Chun LI Lifang SHENG Weihang ZHANG Shangfei HAI Peng HU Department of Marine Meteorology College of Oceanic and Atmospheric SciencesOcean University of ChinaQingdao 266100China Department of Atmospheric Sciences Yunnan UniversityKunming 650500China Yunnan Key Laboratory of Meteorological Disasters and Climate Resources in the Greater Mekong Subregion Yunnan UniversityKunming 650091China Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100190China CMA Earth System Modeling and Prediction Center China Meteorological AdministrationBeijing 100081China

In early February 2023,there was severe haze on the North China Plain(NCP)that was contemporaneous with heavy rainfall over southern China,which was known as southern rainfall-northern haze(SR-NH).Based on observational and reanalysis data,the meteorological causes of this SR-NH event are investigated in this study using correlation analysis,dynamic diagnostics and numerical *** results show that the anticyclonic anomaly in the Pacific Northwest(also referred to as the northeast Asian anomalous anticyclone)is responsible for the *** the one hand,this anticyclonic anomaly leads to persistent rainfall over southern China by causing strong ascending motion in conjunction with an anomalous cyclone over the Chinese mainland and transporting large amounts of water vapor *** the other hand,it weakens the climatological northerly winds of the NCP through the southeasterly flow,worsening the horizontal diffusion conditions of ***,the atmospheric stability and relative humidity over the NCP are significantly increased by this anticyclonic *** conditions result in higher PM2.5concentrations over the *** results suggest that this anticyclonic anomaly is related to diabatic heating released by rainfall in southern China,which not only intensifies the rainfall process there(with a contribution of 11.5%)but also induces an anticyclonic anomaly in the upper troposphere of the Pacific Northwest(i.e.,200 hPa).The rainfall-related anticyclonic anomaly reinforces the anticyclonic anomaly in the Pacific Northwest caused by large-scale circulation(with a contribution of 27%)and thus affects haze over the *** study provides a new reference for understanding the contribution of rainfall in southern China to haze over the NCP.

关键词： Rainfall Haze Diabatic heating anticyclonic anomaly Eastern China

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