An unusual high ozone event over the North and Northeast China during the record-breaking summer in 2018

查看全文 作　　者：Chuhan [1]Lu;Jia [1,2]Mao;Lili [2,4]Wang;Zhaoyong [1]Guan;Guangna [3]Zhao;Mingge [2,4]Li

机构地区：[1]Key Laboratory of Meteorological Disaster,Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044,China;[2]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC),Institute id Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;[3]Meteorological Observatory of Heilongjiang Province,Harbin 150001,China;[4]University of the Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Environmental Sciences》索引2021年第33卷第6期,共13页

基　　金：partially supported by the grant of the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA19020303);the National Key R and D Plan(Quantitative Relationship and Regulation Principle between Regional Oxidation Capacity of Atmospheric and Air Quality(No.2017YFC0210003);the National Natural Science Foundation of China(No.41505133);the Beijing Major Science and Technology Project 510(No.Z181100005418014)。 摘　　要：Under the background of global warming,the summer temperature of the North and Northeast China(NNEC)has significantly increased since 2017,which was accompanied by the aggravated ozone(O_(3))pollution.In 2018,the NNEC experienced a record-breaking summer of the past 40 years.Influenced by the abnormal high temperatures,a regional ozone event occurred on 2-3 August,over 63%of 79 selected cities in the NNEC were exposed to O_(3)pollution,and the maximum value of MDA8 O_(3)reached 268μg/m 3.Observations indicated that ozone concentrations agree well with the maximum temperature at 2 meters(MT2M)over NNEC with a correlation coefficient of 0.69.During the pollution episode,strong downdraft in the local high(35°N-42.5°N,112.5°E-132.5°E;LH)over the NNEC created the favourable meteorological conditions for O_(3)formation.By analyzing the horizontal wind and wave activity fluxes(WAFs)at 200 h Pa,we found that the LH formation was resulted from the Rossby wave propagation from upstream along the mid-latitude Asian jet.The split polar vortex intrusion further strengthened the amplitude of the Rossby wave and reinforced the LH.Moreover,a secondary circulation between Typhoon Jongdari and the LH contributed to the enhanced LH with strong subsidence.On the other hand,the stratospheric intrusions under the deep subsidence also contributed to the enhanced surface O_(3).In this study,the deep-seated meteorological dynamical mechanisms contributing to the abnormal high temperatures were investigated,which can lead to a better understanding of the regional O_(3)pollution over NNEC under the global-warming background. 关键词：Surface O_(3) Abnormal high temperatures North and Northeast China Dynamical mechanism Polar Vortex TYPHOON

相关文献

参考文献（43）
引证文献（7）
耦合文献（187）

参考文献(43)

引证文献(7)

耦合文献(187)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

An unusual high ozone event over the North and Northeast China during the record-breaking summer in 2018

参考文献(43)

引证文献(7)

耦合文献(187)

用户提示