摘要
利用2015—2020年广东省102个国控大气环境监测站臭氧(O_(3))监测数据、广东省21个地市国家基本气象站地面气象观测数据和欧洲中期天气预报中心(ECMWF)第五代大气再分析全球气候数据(ERA5再分析资料),研究了2015—2020年广东O_(3)污染特征、污染天气分型及局地气象要素影响.结果表明:2017—2019年广东O_(3)污染较严重,4—5月O_(3)浓度逐步上升,6月出现一定下降后7月开始持续上升,峰值出现在9—10月;珠三角O_(3)超标率明显高于全省其他地区,粤东O_(3)超标率低于全省平均水平,但浓度平均值高于全省其他地区.基于自组织映射(SOM)方法,将2015—2020年逐日海平面气压和10 m水平风进行分型得到12类环流型,按污染程度分为“污染天气型”、“轻污染天气型”和“清洁天气型”.其中“污染天气型”有台风外围叠加副高型、冷锋前部型、热带系统降水前静稳型、高压底前部型4类.12类天气型所对应的O_(3)浓度与日照时数、最高气温呈显著正相关,与相对湿度呈显著负相关;高温低湿易出现O_(3)污染,但不同区域O_(3)对温度、湿度的响应不同.进一步分析台风外围叠加副高型控制下O_(3)浓度与气象要素的关系,发现日照时数4 h以内,O_(3)浓度增长速率最大,台风外围叠加副高型O_(3)污染跨省输送主要路径为偏北和偏东方向.珠三角O_(3)浓度日变化呈双峰,夜间峰值可能是由于残留层储存日间混合层内的高浓度O_(3)气团,在夜间偏北风的作用下由江西-韶关-清远向珠三角传输,经下沉运动作用下传输至地面导致的.
Based on the ozone(O_(3))monitoring data from 102 state-controlled atmospheric environment monitoring stations in Guangdong,the surface meteorological observation data from the national basic meteorological stations in 21 cities of Guangdong,and the fifth generation atmospheric reanalysis global climate data(ERA5)produced by the European Center for Medium Range Weather Forecasts(ECMWF)from 2015 to 2020,we studied the O_(3)pollution characteristics,weather classifications and meteorological conditions of O_(3)pollution in Guangdong.The results showed that:(1)The O_(3)pollution was relatively serious from 2017 to 2019.The O_(3)concentration gradually increased from April to May,and decreased in June,and then continued to rise from July,with a O_(3)peak occurred between September and October.The non-attainment rate of O_(3)in the Pearl River Delta region was significantly higher than the other regions of Guangdong,and the average concentration of O_(3)in the eastern Guangdong was higher than the other regions.(2)Using the self-organizing mapping method(SOM),the daily sea level pressure field and 10-m horizontal wind field from 2015 to 2020 were classified into 12 circulation patterns.According to the pollution levels,the circulation patterns were divided into“polluted weather type”,“light pollution weather type”and“clean weather type”.The“pollution weather type”includes the subtropical high pressure superimposed typhoon periphery,the front of cold front,the static stability type before precipitation of tropical system and the south to high.The O_(3)concentration corresponding to the 12 weather types was strongly positively correlated with sunshine duration and maximum temperature,negatively correlated with relative humidity.O_(3)pollution was more likely to occur in high temperature and low humidity environment,but the O_(3)concentration had different responses to temperature and humidity in different regions.(3)By analyzing the relationship between O_(3)concentration and meteorological elements unde
作者
曹梅
范绍佳
靳春
蔡倩
贺沅平
CAO Mei;FAN Shaojia;JIN Chun;CAI Qian;HE Yuanping(School of Atmospheric Sciences,Sun Yat-sen University,Zhuhai 519082;Guangdong Meteorological Public Service Center,Guangzhou 510630;Field Scientific Observation and Research Station of Climate,Environment and Air quality Change around the Pearl River Estuary of Guangdong,Guangzhou 510275;Zhuhai Meteorological Service,Zhuhai 519099)
出处
《环境科学学报》
CAS
CSCD
北大核心
2023年第1期19-31,共13页
Acta Scientiae Circumstantiae
基金
广东省重点领域研发计划项目(No.2020B1111360003)
广东省科技计划项目(科技创新平台类)(No.2019B121201002)。
关键词
臭氧
污染天气型
局地气象影响
广东
ozone
weather classification
local meteorological conditions
Guangdong
