2020~2023年太原盆地臭氧时空变化及气象驱动因素分析  

Analysis of Spatial-temporal Variation and Meteorological Driving Factors of Ozone in the Taiyuan Basin from 2020 to 2023

作　　者：郭伟 闫世明[1,2] 高媛 朱凌云 岳江 王小兰 GUO Wei;YAN Shi-ming;GAO Yuan;ZHU Lin-yun;YUE Jiang;WANG Xiao-lan(Shanxi Institute of Meteorological Sciences,Taiyuan 030002,China;Wutaishan Cloud Physics Field Experiment Base,China Meteorological Administration,Xinzhou 035515,China)

机构地区：[1]山西省气象科学研究所,太原030002 [2]中国气象局五台山云物理野外科学试验基地,忻州035515

出　　处：《环境科学》2025年第4期2125-2134,共10页Environmental Science

基　　金：山西省气象局重点项目(SXKZDDW20246759);山西省自然科学基金项目(201901D111465)。

摘　　要：为研究太原盆地臭氧(O_(3))的时空变化及影响因素,基于太原盆地11个区县2020~2023年逐日最大O_(3)-8h浓度资料及同期气象数据,利用旋转经验正交函数(REOF)分解,分析了太原盆地O_(3)的主要空间分布模态、时间变化以及气象驱动因素,并进一步研究了太原盆地山谷风环流和区域输送对O_(3)浓度的影响.结果表明,太原盆地日最大O_(3)-8h第90百分位浓度呈波动变化特征,2021和2023年浓度较高.太原盆地O_(3)-8h浓度REOF前三模态方差解释率为75.9%,第一模态O_(3)空间分布特征为“北高南低”,第二模态为“南高北低”,第三模态为“南北低中部高”,前两种模态时间系数高值多分布在6月中旬至7月底,第三模态时间系数高值出现时间的年际差异较大.根据O_(3)的空间分布模态,可以将太原盆地分为北区(太原和榆次)、南区(汾阳、孝义、介休)和中区这3个部分.气温和风速对太原盆地O_(3)空间分布影响较小,不同风向引起的局地输送差异是形成O_(3)不同空间分布模态的主要气象驱动因素.山谷风控制期间太原盆地O_(3)呈南北同高中部稍低的分布特征,ρ(O_(3)-8h)平均值较非山谷风期间偏高约20μg·m^(−3).不同输送轨迹对太原盆地O_(3)影响不同,来自东南、南部和西部的污染物输送会导致太原盆地O_(3)污染水平升高.To study the spatio-temporal variations and influencing factors of ozone(O_(3))in the Taiyuan Basin,the main spatial distribution modes,temporal variations,and meteorological drivers of O_(3)concentration were analyzed based on the day-by-day maximum O_(3)-8h concentration data of 11 counties in the Taiyuan Basin from 2020 to 2023 and the meteorological data for the same period using the rotated empirical orthogonal function(REOF)decomposition.The effects of valley wind circulation and regional transport on O_(3)concentration in the Taiyuan Basin were further analyzed.The results indicated that the daily maximum O_(3)-8h 90th percentile concentration in the Taiyuan Basin exhibited fluctuating characteristics,with higher concentrations in 2021 and 2023.The variance interpretation rate of the top three modes of REOF for the concentration of O_(3)in the Taiyuan Basin was 75.9%.The spatial distribution characteristics of the first mode of O_(3)were“high in the north and low in the south,”those of the second mode were“high in the south and low in the north,”and those of the third mode were“low in the north and south and high in the middle.”The high values of the time coefficients of the first two modes were mostly distributed from the middle of June to end of July.The interannual difference in the time when the high values of the time coefficients of the third mode appeared was large.According to the spatial distribution mode of O_(3),the Taiyuan Basin could be divided into three parts:the northern(Taiyuan and Yuci),southern(Fenyang,Xiaoyi,and Jiexiu),and central regions.Temperature and wind speed had less influence on the spatial distribution of O_(3)in the Taiyuan Basin,and localized transport differences caused by different wind directions were the main meteorological drivers for the formation of different spatial distribution modes of O_(3).The proportion of valley wind in the Taiyuan Basin was 34.5%.During the period of valley wind control,O_(3)in the basin showed a slightly lower distribution pattern

关 键 词：O_(3)空间分布 旋转经验正交函数(REOF) 气象驱动因素 山谷风 太原盆地 

分 类 号：X515[环境科学与工程—环境工程]