2022年慈溪市一次臭氧污染过程的气象成因分析  

Analysis of the meteorological reasons of an ozone pollutionprocess in Cixi City in 2022

作　　者：韦颖 范凯锋 孔万林 刘子菱 李清斌 林宏伟 Wei Ying;Fan Kaifeng;Kong Wanlin;Liu Ziling;Li Qingbin;Lin Hongwei(Cixi Meteorology Bureau,Ningbo 315300,China;Hangzhou National Base Climate Station,Hangzhou 310008,China)

机构地区：[1]慈溪市气象局,浙江宁波315300 [2]杭州国家基准气候站,杭州310008

出　　处：《环保科技》2025年第1期29-35,42,共8页Environmental Protection and Technology

摘　　要：利用环境监测资料和气象要素的地面、垂直探测资料及再分析资料,对2022年9月6-8日慈溪市一次臭氧污染过程的特点及气象成因进行分析。结果表明:(1)本次O_(3)污染过程O_(3)-8h逐日升高,最大值出现在8日,达到253.0μg·m^(-3),为中度污染。O_(3)浓度逐日呈“单峰型”变化,每日谷值出现在5:00-7:00,峰值出现在14:00-16:00。(2)污染时段西太副高西伸北抬,强度增强,低层反气旋环流控制,地面均压场。对流层下层的低湿配合下沉气流及近地面逆温有利于污染物在近地面积累。(3)污染期间出现O_(3)浓度高值的主要地面气象条件为:高温低湿风速小,偏北风是O_(3)污染物的主要输送方向。气温是此次O_(3)污染过程的首要气象影响因子,其次是相对湿度。高浓度O_(3)出现时气温在28~33℃,相对湿度在46%~62%。本研究为开展慈溪臭氧污染过程管控提供科学支撑。In order to study the characteristics and meteorological mechanism of an ozone pollution event that happened in Cixi City from 6 th to 8 th Sept,2022,environmental monitoring data,surface and vertical sounding of meteorological elements and reanalysis data were collected and analyzed.The results were as follows:During this ozone pollution event,the O_(3)-8h increased day by day and the maximum value 253.0μg·m^(-3) occurred on the 8 th Sept.The daily change of the O_(3) concentration showed a‘single peak’trend,with a valley at 5:00-7:00 and a peak at 14:00-16:00.During the pollution period,the Western Pacific Subtropical High extended westward and lifted northward with enhanced intensity.In the meanwhile,the lower atmosphere was controlled by anticyclonic circulation,and the ground-level atmosphere was in a uniform pressure field.Low humidity in the lower troposphere combined with the downdraft and near-surface inversion were favorable conditions for the accumulation of pollutants near the surface.The major meteorological conditions for high O_(3)concentration during the pollution period were:high temperature,low humidity,and low wind speed.And the main diffusion direction of O_(3) was northward.Further analysis shows that air temperature was the most significant meteorological factor for this O_(3) pollution process,followed by relative humidity.The study indicates that when the high concentration of O_(3) occurred,the air temperature was between 28℃ and 33℃,and the relative humidity was between 46% and 62%.This study provides scientific support for the ozone pollution process control in Cixi City.

关 键 词：臭氧污染 气象成因 慈溪 

分 类 号：X515[环境科学与工程—环境工程]