2020年“三连击”台风对我国东部地区O_(3)污染的影响分析  

Analysis of O_(3) Pollution Affected by a Succession of Three Landfall Typhoons in 2020 in Eastern China

作　　者：花丛 尤媛 王皘 张碧辉 HUA Cong;YOU Yuan;WANG Qian;ZHANG Bi-hui(National Meteorological Center,Beijing 100081,China)

机构地区：[1]国家气象中心,北京100081

出　　处：《环境科学》2024年第1期71-80,共10页Environmental Science

基　　金：国家重点研发计划项目(2022YFC3701205);国家气象中心预报员专项(Y202126)。

摘　　要：基于空气质量监测、地面气象资料、风廓线雷达观测等数据和HYSPLIT模型,对2020年8月26日至9月8日2008号台风“巴威”、2009号台风“美莎克”和2010号台风“海神”影响期间我国中东部地区的O_(3)污染特征及成因进行了分析.结果表明“,三连击”台风期间京津冀及周边地区和长三角地区出现O_(3)污染的站点数均超过50%“,海神”影响期间两个区域O_(3)污染日数分别达到2.22 d和2.97 d,持续性特征显著.台风位置对O_(3)浓度影响明显,当台风位于24 h和48 h警戒线之间时,京津冀及周边地区O_(3)浓度最高;当台风移动至34°N以北时,长三角地区最易于出现区域性O_(3)污染.上海O_(3)污染主要出现在台风西侧偏北气流控制下,来自上游的区域传输对O_(3)及前体物浓度升高影响明显;1000 m以下的下沉气流使O_(3)在夜间维持较高浓度.济南O_(3)污染期间大气中低层盛行下沉气流.8月28~30日在副热带高压控制下,污染来源以本地积累叠加省内传输为主,出现O_(3)和PM_(2.5)“双高”现象;9月5~8日在“海神”外围环流影响下,跨省输送明显,O_(3)浓度增长早于PM_(2.5)浓度增长.Based on air quality monitoring,surface meteorological data,wind profile radar observation,and the HYSPLIT model,the characteristics and causes of O_(3) pollution in eastern China during the period of the typhoons BAVI,MAYSAK,and HAISHEN from August 26 to September 8,2020 were analyzed.The results showed that during the succession of the three landfall typhoons,the O_(3) pollution sites in Beijing Tianjin Hebei and its surrounding areas(BTHS)and the Yangtze River Delta(YRD)exceeded 50%.During the HAISHEN period,O_(3) pollution days in the two regions reached 2.22 d and 2.97 d,respectively,with significant persistence characteristics.The location of the typhoon had an obvious influence on O_(3) concentration.When the typhoons were located within the 24h warning line,the O_(3) concentrations in BTHS and YRD were relatively low.When the typhoons were located between the 24 h and 48 h warning lines,the O_(3) concentration in BTHS was the highest.When the typhoons moved north of 34°N,the YRD was most prone to regional O_(3) pollution.O_(3) pollution in Shanghai mainly occurred under the control of the northward air flow to the west side of the typhoons,and the regional transport from the upstream area had a significant impact on the increase in O_(3) and its precursor concentrations.The downdraft below 1000 m maintained O_(3) at a high concentration at night.In Jinan,O_(3) pollution mainly occurred under the control of the subtropical high and typhoon periphery.The downdraft prevailed in the middle and lower levels during the O_(3) pollution.From August 28 to 30,under the control of the subtropical high,the pollutants were mainly accumulated locally,and some of them were transmitted within the province,showing a"double high"phenomenon of O_(3) and PM_(2.5).From September 5 to 8,under the influence of HAISHEN peripheral circulation,the regional transport was obvious,and the O_(3) concentration increased earlier than that of PM_(2.5).

关 键 词：台风 O_(3)污染 京津冀及周边地区 长三角地区 区域传输 下沉气流 

分 类 号：X515[环境科学与工程—环境工程]