山西夏季臭氧光化学生成敏感区分布和变化  

Spatiotemporal Distributions and Variations in Summertime Ozone Photochemical Production Regimes over Shanxi

作　　者：于小红 杨爱琴 陈玲 王雁 朱凌云 汪文雅 王小兰[1,2] 闫世明 陈二萍 YU Xiao-hong;YANG Ai-qin;CHEN Ling;WANG Yan;ZHU Ling-yun;WANG Wen-ya;WANG Xiao-lan;YAN Shi-ming;CHEN Er-ping(Monitoring and Assessment Center for Greenhouse Gases and Carbon Neutrality of China Meteorological Administration,Shanxi Branch,Shanxi Institute of Meteorological Science,Taiyuan 030002,China;Wutaishan Cloud Physics Field Experiment Base,China Meteorological Administration,Taiyuan 030002,China;School of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Carbon Neutrality Research Center,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China)

机构地区：[1]山西省气象科学研究所,中国气象局温室气体及碳中和监测评估中心山西分中心,太原030002 [2]中国气象局五台山云物理野外科学试验基地,太原030002 [3]中国科学院大学地球与行星学院,北京100049 [4]中国科学院大气物理研究所碳中和研究中心,北京100029

出　　处：《环境科学》2024年第8期4432-4439,共8页Environmental Science

基　　金：国家重点研发计划项目(2019YFC1510301,2019YFC1510304);山西省气象局项目(SXKMSDW20226309,SXKMSDW20226325,SXKZDDW20246759);山西省基础研究计划青年基金项目(20210302124202,202203021222423)。

摘　　要：利用2013~2022年的5~8月臭氧检测仪(OMI)的甲醛柱浓度(HCHO)和对流层二氧化氮柱浓度(NO_(2))卫星遥感数据,结合地面臭氧(O_(3))观测数据,计算了山西FNR(HCHO/NO_(2))的阈值,研究了山西夏季近地面O_(3)光化学生成敏感区的分布和变化.结果表明:(1)2013~2022年夏季,山西VOCs敏感区(FNR<2.3)明显缩小,VOCs-NO_(x)过渡区(FNR介于2.3~4.1)先增后减,NO_(x)敏感区(FNR>4.1)显著扩张;(2)2013~2019年夏季,HCHO柱浓度上升与对流层NO_(2)柱浓度下降,共同导致FNR上升,2016年起山西总体处于NO_(x)敏感区,但NO_(x)减排的进程中城市区域由VOCs敏感区逐渐向VOCs-NO_(x)过渡区转变,导致O_(3)污染加重且普遍存在;2020~2022年,HCHO与NO_(2)协同下降,O_(3)浓度有所降低.(3)2022年夏季,临汾和运城出现了O_(3)“周末效应”的反转,其余9个城市仍存在O_(3)“周末效应”,O_(3)“周末效应”并不完全取决于前体物排放的变化,还与O_(3)光化学生成敏感性密切相关.山西O_(3)污染治理需NO_(x)和VOCs协同减排,此外太原、阳泉、运城、晋城应继续深入推进NO_(x)减排.Satellite-based formaldehyde(HCHO)columns and tropospheric nitrogen dioxide columns were observed using the Ozone Monitoring Instrument(OMI),and groundbased observations of ozone(O_(3))for May-August from 2013 to 2022 were connected to calculate the threshold values of the HCHO to NO_(2)ratio(FNR)in Shanxi Province.Then,the spatiotemporal distributions and variations in summertime ozone photochemical production regimes were analyzed.The results showed that:①The volatile organic compound(VOC)-sensitive regime area(FNR<2.3)was obviously reduced,while the VOCs-NO_(x)transitional regime(FNR between 2.3-4.1)area increased in the early years and then decreased,and NO_(x)-sensitive regime area expanded significantly in summer from 2013 to 2022 over Shanxi Province.②The increased summertime FNR during 2013 to 2019 was associated with the co-effect of increased HCHO columns and decreased tropospheric NO_(2)columns.The Shanxi Province was generally under an NO_(x)regime since 2016,which reflected the remarkable effect of NO_(x)emission reductions;however,there was a shift from a VOC-sensitive regime to a VOCs-NO_(x)transitional regime,in which O_(3)pollution aggravation was widespread under the background of decreased NO_(x)emissions.The decrease in O_(3)concentration during 2020 to 2022 followed the synergistical declines in HCHO columns and tropospheric NO_(2)columns.③The O_(3)weekend effects were reversed in Linfen and Yuncheng but were persistent in the other nine cities.Satellite-based weekend HCHO and NO_(2)levels were higher than those on weekdays in some cities of Shanxi Province,indicating that the O_(3)weekend effect was not only dependent on the changes of precursors emissions but was also closely related to O_(3)photochemical production sensitivity.The results indicated the necessity of simultaneous controls in NO_(x)emissions and VOCs emissions for ozone abatement plans over Shanxi Province.In addition,Taiyuan,Yangquan,Yuncheng,and Jincheng should continue to promote reduction in NO_(x)emissions.

关 键 词：山西 臭氧(O_(3)) 前体物 生成机制 臭氧检测仪(OMI) 卫星遥感 周末效应 

分 类 号：X515[环境科学与工程—环境工程]