2015—2018年青海东部城市群O_(3)污染特征及其气象条件分析  

Ozone pollution characteristics and the meteorology in the eastern urban agglomeration of Qinghai province from 2015 to 2018

作　　者：谢启玉 李京梅 周琴 赵娟 郭晓宁 XIE Qi-yu;LI Jing-mei;ZHOU Qin;ZHAO Juan;GUO Xiao-ning(Xining Meteorological Observatory,Xining 810016,China;Qinghai Province Meteorological Observatory,Xining 810016,China)

机构地区：[1]西宁市气象台,青海西宁810016 [2]青海省气象台,青海西宁810016

出　　处：《气象与环境学报》2023年第2期53-61,共9页Journal of Meteorology and Environment

基　　金：青海省气象局重点项目(2019);青海省气象局面上项目(QXM2020-27)共同资助。

摘　　要：利用2015—2018年青海东部城市群的逐日空气质量数据、常规气象观测和ERA-Interim再分析资料,对该地区O_(3)污染天气特征及其气象条件进行了分析。结果表明:最高(低)气温、温度露点差、日照时数及总辐射为青海东部城市群O_(3)污染的正向影响因子,其中最高气温、温度露点差及总辐射的影响程度最大。海平面气压、|ΔP_(24)|、|ΔT_(24)|、总(低)云量为负向影响因子,其中海平面气压和|ΔT_(24)|的影响程度最大。O_(3)污染日的地面天气系统类型主要为低压型、低压前部型及均压场型,其中低压前部型和低压型最有利于O_(3)污染天气的发生,这两种天气类型较为稳定且不容易被破坏。O_(3)污染日的近地面层为热低压,中层弱对流受上空稳定气流抑制,受高压中心或高压脊控制的辐散环流及下沉运动(低压型)影响,无明显垂直运动(低压前部型及均压场型)。垂直方向存在多层逆温层,地面层干区明显,风速整体上较小,为该地区O_(3)污染提供了有利的大气层结条件。Based on daily air quality data,conventional meteorological observations,and ERA-Interim reanalysis data from 2015 to 2018,the characteristics of the ozone pollution process and its meteorological conditions in the eastern Qinghai urban agglomeration were analyzed.The results show that the maximum and minimum temperature,temperature dew point difference,sunshine duration,and total radiation are the positive influencing factors of ozone pollution in the eastern Qinghai urban agglomeration,among which the maximum temperature,temperature dew point difference,and total radiation influence the most significantly.Sea level pressure,24-hour pressure,and temperature variation,total and low cloud cover are the negative impact factors,among which the sea level pressure and 24-hour temperature influence the most significantly.The surface weather system types on ozone pollution days mainly include low-pressure type,low-pressure front type,and pressure equalizing field type,among which the low-pressure front type and low-pressure type are the most conducive to the occurrence of ozone pollution process,which appear stable and not prone to be destroyed.On ozone pollution days,the surface layer is controlled by hot low pressure background,whereas the weak convection in the middle layer is inhibited by the stable air flow above,which is affected by the divergence circulation and subsidence movement(low-pressure type)due to the high-pressure center or ridge,rarely appearing vertical movement(low-pressure front type and even pressure type).Multiple inversion layers in the vertical direction,a significant dry zone in the ground layer,and lower wind speed on the whole provide favorable atmospheric stratification conditions for ozone pollution over the eastern Qinghai urban agglomeration.

关 键 词：O_(3)污染日 天气类型 大气层结 

分 类 号：X515[环境科学与工程—环境工程]