南京地区局地积累型和外来输送型O_(3)污染模拟研究  

Modelling of Local Accumulation and External Transport of O_(3) Pollution in Nanjing Area

作　　者：裴宇儇 彭薇 王红磊[1] 卢文 赵天良[1] 刘思晗 武自豪 可玥 PEI Yuxuan;PENG Wei;WANG Honglei;LU Wen;ZAHO Tianliang;LIU Sihan;WU Zihao;KE Yue(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science&Technology;Hunan Meteorological Information Center,Hunan Meteorological Bureau)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,中国气象局气溶胶-云-降水重点开放实验室 [2]湖南省气象信息中心气象防灾减灾湖南省重点实验室

出　　处：《地球与环境》2024年第2期154-165,共12页Earth and Environment

基　　金：国家重点研发计划项目(2022YFC3701204);国家自然科学基金项目(42275196、41830965);江苏省自然科学基金项目(BK20231300)。

摘　　要：利用观测资料和WRF-Chem空气质量模式对南京地区局地积累型和外来输送型O_(3)污染过程的时空分布特征和潜在机制进行了研究。结果表明:(1)水平分布特征,在两次O_(3)污染整体过程中,外来输送型O_(3)污染浓度高值区分布范围相比局地积累型更大且较为分散。但在两次O_(3)污染过程中最严重的白天,局地积累型O_(3)污染浓度高值区分布范围大且集中,O_(3)浓度大部分均超过160μg/m^(3);而外来输送型O_(3)污染浓度高值区分布范围更小且更为分散,O_(3)浓度在120~160μg/m^(3)的地区范围显著大于局地积累型O_(3)污染;(2)垂直分布特征,在污染过程前期,局地积累型O_(3)污染在2 km以下高度处有着高浓度O_(3),浓度最高超250μg/m^(3),而外来输送型O_(3)污染浓度高值区主要集中在2~2.5 km高度处,且高值区浓度最高不超过200μg/m^(3);在污染过程中期,局地积累型O_(3)污染浓度高值区集中在2 km高度下,且在1 km左右高度处O_(3)浓度出现最大值;而外来输送型O_(3)污染浓度高值区最高可达到2.6 km左右,并且浓度最大值集中在1.5 km高度以下,均超过250μg/m^(3);在污染过程后期,局地积累型O_(3)污染浓度高值区逐渐消散,但外来输送型O_(3)污染在0.5~3 km高度内仍出现大范围O_(3)浓度高值区;(3)在生成机理方面,近地面O_(3)的高浓度在局地积累型O_(3)污染中主要依赖于垂直混合,96h内总贡献为451.7μg/m^(3),在总过程量中占比为66.2%,而在外来输送型O_(3)污染中主要依赖于水平平流和垂直混合,72h内总贡献分别为1050.2μg/m^(3)和799.1μg/m^(3),总量在总过程量中占比为61.5%。在500 m高度处,局地积累型O_(3)污染前期O_(3)的高浓度主要依赖于垂直平流和化学过程,中期只依赖于化学过程,后期则主要依赖于水平平流和化学过程。但在外来输送型O_(3)污染前中后期中高O_(3)浓度均主要依赖于水平平流和化学过程。在1000 m高度处,两个�The spatial and temporal distribution characteristics and potential mechanisms of local accumulation and transported O_(3) pollution in Nanjing were investigated using observation data and the WRF-Chem air quality model.The results show that,for the horizontal distribution characteristics the distribution of high values of exogenous O_(3) pollution is larger and more dispersed than that of local accumulation O_(3) pollution during the two O_(3) pollution episodes.However,during the most severe daytime hours of both O_(3) pollution processes,the distribution of high value areas of local accumulation O_(3) pollution was large and concentrated,with most of the O_(3) concentrations exceeding 160μg/m^(3),while the distribution of high value areas of external transport O_(3) pollution was smaller and more dispersed,with concentrations in the range of 120-160μg/m^(3) being significantly larger than that of local accumulation O_(3) pollution.For the vertical distribution characteristics,in the early stage of the pollution episode,local accumulation O_(3) pollution has high O_(3) concentrations below 2 km height,with concentrations up to 250μg/m^(3),while the high value areas of external transport O_(3) pollution are mainly concentrated at 2-2.5 km height,and the highest concentration does not exceed 200μg/m^(3);in the middle of the pollution process,the high value area of local accumulation O_(3) pollution concentration is concentrated under 2 km height,and the maximum O_(3) concentration occurs at about 1 km height;while the high value area of external transport O_(3) pollution concentration can reach up to about 2.6 km height,and the maximum concentration is concentrated under 1.5 km height,and all exceed 250μg/m^(3);in the late stage of the pollution process,the high value area of local accumulation O_(3) pollution concentration gradually dissipates,but the external transport of O_(3) pollution still appears in a wide areas within 0.5-3 km altitude.In terms of generation mechanism,high near-surface O_(3) concentr

关 键 词：O_(3) 观测分析 WRF-Chem 过程分析 南京 

分 类 号：X51[环境科学与工程—环境工程]