残留层臭氧向下混合对地面臭氧的影响——以胶东半岛沿海地区秋季典型臭氧污染过程为例  

Influence of downward-mixing ozone in the residual layer on surface ozone-cases study of typical autumn ozone pollution processes in the coastal areas of Jiaodong Peninsula

作　　者：孟赫 王威[2] 张淼 代玮 马艳 许杨 MENG He;WANG Wei;ZHANG Miao;DAI Wei;MA Yan;XU Yang(Qingdao Eco-environment Monitoring Center of Shandong Province,Qingdao 266003,China;State Environmental Protection Key Laboratory of Quality Control in Environmental Monitoring,China National Environmental Monitoring Center,Beijing 100012,China;Shandong Provincial Eco-Environment Monitoring Center,Jinan 250101,China;Qingdao Meteorological Bureau,Qingdao 266003,China)

机构地区：[1]山东省青岛生态环境监测中心,山东青岛266003 [2]中国环境监测总站,国家环境保护环境监测质量控制重点实验室,北京100012 [3]山东省生态环境监测中心,山东济南250101 [4]青岛市气象局,山东青岛266003

出　　处：《中国环境科学》2024年第11期5950-5960,共11页China Environmental Science

基　　金：山东省自然科学基金资助重大基础研究项目(ZR2020ZD21);山东省自然科学基金资助项目(ZR2021MD013,ZR2021MD116)。

摘　　要：基于差分吸收臭氧激光雷达和相干多普勒测风激光雷达垂直观测资料等,结合地面站污染物浓度和气象要素数据,以胶东半岛沿海城市青岛市为例,研究2023年10月16~26日在胶东沿海地区出现的典型臭氧(O_(3))污染过程的气象成因,探究污染过程期间O_(3)浓度垂直演变及垂直风场的影响,评估残留层O_(3)向下混合对地面O_(3)浓度的影响.结果表明:观测期间青岛市共发生了2次O_(3)轻度污染过程,17~18日(过程Ⅰ)和22~25日(过程Ⅱ),其中18日、23~25日为污染日,O_(3)-8h浓度分别为197,171,179和169μg/m~3.2次污染过程发生均与850hPa位势高度场升温过程相关,太阳辐射较强,夜间多有接地逆温,稳定边界层高度多低于200m,日均大气边界层高度相对较低,气象条件有利于O_(3)生成和污染物累积.污染过程结束均与冷空气北风降温等影响有关.O_(3)本地生成是造成胶东沿海地区O_(3)污染的核心原因,在持续升温、较高的太阳辐射和不利于污染物扩散的大气环流形势影响下,可诱发连续性O_(3)区域污染过程,同时西南低空急流作用下残留层O_(3)输送可加剧地面O_(3)污染,影响范围可达400~500km.残留层O_(3)向下混合主要发生在早间~上午边界层高度抬升阶段,观测期间7:00~12:00边界层内O_(3)垂直输送通量范围为-20.2~-36.0μg/(m^(2)·s),残留层O_(3)垂直混合对地面O_(3)贡献率均值为26.4%(15.1%~43.2%),其中9:00贡献率最大,污染过程Ⅱ垂直混合对地面O_(3)的贡献率均值为23.8%(15.4%~36.5%),污染日和清洁日没有明显差异.研究结果表明,O_(3)污染防治首先应做好本地污染减排工作,其次还需要加强区域联防联控.Based on differential absorption ozone lidar and coherent Doppler wind lidar vertical observation,as well as surface pollutant concentration and meteorological data,a study was conducted in the coastal city of Qingdao of Jiaodong Peninsula,focusing on meteorological causes of typical ozone(O_(3))pollution events occurred from October 16th to 26th,2023.The study aimed to explore the vertical evolution in O_(3)concentrations during the pollution events,as well as the influence of wind profiles on O_(3)distribution vertically.Besides,contributions of downward mixing of residual layer O_(3)affected on surface O_(3)concentrations was also evaluated.The results indicated that there were two O_(3)pollution events during the observation period:event I from the 17th to 18th,and event II from 22nd to 25th.O_(3)-8h concentrations on 18th,23rd to 25th were 197,171,179,and 169μg/m3,respectively.These two O_(3)pollution events were associated with warming processes at 850hPa geopotential height,intensive solar radiation,nocturnal ground-based inversions,lower stable boundary layers(below 200m),and lower daily atmospheric boundary layer heights.These atmospheric meteorological conditions favored O_(3)formation and air pollutants accumulation.Both two O_(3)pollution events concluded with cold air advection from the north.Local O_(3)production was identified as the primary cause of O_(3)pollution in Jiaodong Peninsula.Persisting warmth,intense solar radiation,and unfavorable atmospheric circulation patterns led to continuous regional O_(3)pollution.Moreover,transport of residual layer O_(3)by the southwest low-level jet could exacerbated surface O_(3)pollution within a range of 400~500km.Vertical mixing of residual layer O_(3)was found to play a crucial role on surface O_(3)concentrations,particularly during morning hours as the atmospheric boundary layer height increases.Between 7:00 and 12:00,the O_(3)vertical transport flux in the boundary layer ranged from-20.2 to-36.0μg/(m^(2)·s).On average,vertical mixing of residual lay

关 键 词：胶东半岛 臭氧 垂直分布 激光雷达 残留层 

分 类 号：X515[环境科学与工程—环境工程]