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第二十五届大气污染防治技术研讨会

作者： Zhijun Zhao Shaw Chen Liu Run Liu Ziyin Zhang Yanzi Li Huisi Mo Yanxing Wu Institute for Environmental and Climate Research Jinan University Institute of Urban Meteorology China Meteorological Administration Shenzhen Academy of Environmental Sciences

During the past few years,winter haze pollution in the Fenwei Plain (FWP)region had obviously *** this study,we used quantitative and correlation analysis methods to analyze the temporal and spatial distribution and the influence of the meteorological and climatic factors on haze pollution in the ***,climatic factors were used to effectively predict the number of winter haze days (NHD) in the FWP based on the adjusted optimal subset model (AOSM).The results show that on the long-term changes,the winter haze pollution in the FWP from 1984-2017 showed an overall upward trend,especially increased more serious after *** the interannual variability,the evolution of Eurasian teleconnections affected the changes of Siberian high and Aleutian low pressure and resulted in changes in wind speed at 850 hPa,boundary layer height and relative humidity in the lower troposphere,which affected the *** to the best fit model,the average minimum contribution (CON) of climate and meteorological conditions to winter haze pollution was 24.3%from 1984–2016 and the modulating role increased significantly after 2010 (CON=55.8%).The explained variance (R) and mean absolute error (MAE) of the models for the entire winter were 88%and 3.54 days,*** predictions in November,December,January,and February,the R was above 71%and the MAE was below 1.83 days;independent predictions in 2018 showed that the bias was five days lower than that for the entire *** addition,the results of recycling independent tests indicate that all models have excellent stability,proving that the climate factors chosen by AOSM do affect haze pollution in the FWP.

关键词： Fenwei Plain winter haze pollution climate and meteorological conditions adjusted optimal subset model(AOSM)

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Control of fine particulate nitrate during severe winter haze in“2+26”cities

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Journal of Environmental Sciences 2024年第2期136卷 261-269页

作者： Chuang Qin Xiao Fu Tao Wang Jian Gao Jiaqi Wang Institute of Environment and Ecology Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Department of Civil and Environmental Engineering Hong Kong Polytechnic UniversityHong Kong 99907China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 10084China

The“2+26”cities,suffering the most severe winter haze pollution,have been the key region for air quality improvement in *** prominent nitrate pollution is one of the most challenging environmental issues in this region,necessitating development of an effective control ***,we use observations,and state-of-the-art model simulations with scenario analysis and process analysis to quantify the effectiveness of the future SO_(2)-NO_(X)-VOC-NH_(3) emission control on nitrate pollution mitigation in“2+26”*** on a serious winter haze episode,we find that limited NO_(X)emission reduction alone in the short-term period is a less effective choice than VOC or NH_3emission reduction alone to decrease nitrate concentrations,due to the accelerated NO_(X)-HNO_(3)conversion by atmospheric oxidants and the enhanced HNO_(3)to NO_(3)^(-)partition by ammonia,although deep NO_(X)emission reduction is essential in the long-term *** synergistic NH_(3) and VOC emission control is strongly recommended,which can counteract the adverse effects of nonlinear photochemistry and aerosol chemical feedback to decrease nitrate *** extra benefits will be reduced if the synergistic NH_(3) and VOC reduction is delayed,and thus reducing emission of multiple precursors is urgently required for the effective control of increasingly severe winter nitrate pollution in“2+26”cities.

关键词： Nitrate winter haze pollution Emission reduction “2+26”cities

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