不同因子对银川光解速率和臭氧影响模拟研究  

Simulation Study on Effects of Different Factors on Photolysis Rate and Ozone in Yinchuan

作　　者：严晓瑜[1,2,3] 缑晓辉[3] 龚晓丽[3] 杨苑媛 朱海斌 杨侃 YAN Xiaoyu;GOU Xiaohui;GONG Xiaoli;YANG Yuanyuan;ZHU Haibin;YANG Kan(Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions,CMA,Yinchuan 750000,China;Ningxia Key Laboratory of Meteorological Disaster Prevention and Reduction,Yinchuan 750000,China;Ningxia Meteorological Service Center,Yinchuan 750000,China;Yinchuan Meteorological Bureau,Yinchuan 750000,China)

机构地区：[1]中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室,宁夏银川750000 [2]宁夏气象防灾减灾重点实验室,宁夏银川750000 [3]宁夏气象服务中心,宁夏银川750000 [4]银川市气象局,宁夏银川750000

出　　处：《环境科学与技术》2023年第4期110-120,共11页Environmental Science & Technology

基　　金：宁夏自然科学基金项目(2021AAC03487);国家自然科学基金项目(41765006);宁夏回族自治区重点研发计划(2019BFG02025)。

摘　　要：文章利用WRF-Chem模式对银川市2019年8月4-8日一次近地面臭氧污染过程进行模拟,探讨了气象条件、气溶胶浓度及气溶胶光学特性等不同因子对J[O^(1)D]、J[NO_(2)]和臭氧的影响。结果表明,J[O^(1)D]和J[NO_(2)]日变化呈单峰型,臭氧呈单峰单谷型,但光解速率和臭氧浓度的日均值、峰值、波动性等受天气条件和大气气溶胶浓度变化影响差异较大。影响J[O^(1)D]、J[NO_(2)]的最主要气象因子是辐射,其次是气温,弱天气背景下,辐射强、气温高、风速小的气象条件有利于促进光化反应发生,会造成较高的J[O^(1)D]、J[NO_(2)]和臭氧浓度,而弱辐射和低温则会导致J[O^(1)D]、J[NO_(2)]和臭氧浓度的明显降低。传输作用也严重影响着J[O^(1)D]、J[NO_(2)]和臭氧浓度,来自偏北方向的清洁气流以及良好的大气污染扩散条件会降低J[O^(1)D]、J[NO_(2)]和臭氧浓度。J[O^(1)D]、J[NO_(2)]和臭氧浓度均与AOD、PM_(10)和PM_(2.5)呈显著负相关,与SSA和AE呈明显正相关,比较而言,J[O^(1)D]、J[NO_(2)]与大气气溶胶浓度以及气溶胶光学特性的相关性较臭氧与大气气溶胶浓度及其光学特性的相关性好,且J[O^(1)D]和J[NO_(2)]与AOD相关性最强,其次是PM_(10),再次是PM_(2.5),臭氧与AOD相关性最强,其次是SSA,再次是PM_(10),J[O^(1)D]、J[NO_(2)]和臭氧与AE相关性均最弱。WRF-Chem was applied to simulate the near-surface ozone pollution episode from August 4-8,2019 in Yinchuan,and then the effects of meteorological conditions,aerosol concentration and aerosol optical properties on J[O^(1)D],J[NO_(2)]and ozone were investigated.The results showed that the diurnal variation of J[O^(1)D]and J[NO_(2)]was single-peak,and ozone was single-peak and single-valley,but the daily mean,peak and fluctuation of photolysis rate and ozone concentration were affected by weather conditions and atmospheric aerosol concentration.The most important meteorological factor affecting J[O^(1)D]and J[NO_(2)]was radiation,followed by temperature.Under the background of weak weather,the meteorological conditions of strong radiation,high temperature and low wind speed were favorable to promote the occurrence of photochemical reaction,which will cause higher concentrations of J[O^(1)D],J[NO_(2)]and ozone,while weak radiation and low temperature resulted in a significant decrease in the concentrations of J[O^(1)D],J[NO_(2)]and ozone.Transport also seriously affects J[O^(1)D],J[NO_(2)]and ozone concentrations,and clean airflow from the northerly direction and favorable atmospheric pollution diffusion conditions will reduce J[O^(1)D],J[NO_(2)]and ozone concentrations.J[O^(1)D],J[NO_(2)]and ozone concentrations were all significantly negatively correlated with AOD,PM_(10) and PM_(2.5),and significantly positively correlated with SSA and AE.In comparison,J[O^(1)D],J[NO_(2)]had better correlations with aerosol concentration and optical properties than ozone did with aerosol concentration and optical properties,and J[O^(1)D]and J[NO_(2)]had the strongest correlation with AOD,followed by PM_(10),and then PM_(2.5).Ozone had the strongest correlation with AOD,followed by SSA,and then PMio.J[O^(1)D],J[NO_(2)]and ozone all had the weakest correlation with AE.

关 键 词：臭氧 WRF-Chem 光解速率 银川 

分 类 号：X16[环境科学与工程—环境科学] X515