基于风廓线雷达的广州边界层局地回流指数廓线对污染物浓度的影响  

The influence of local reflux index profile of Guangzhou boundary layer based on wind profiler radar on the pollutant concentration

作　　者：曾琳 伍志方[2,3] 范绍佳 郑嘉雯 祁秀香 李怀宇 ZENG Lin;WU Zhifang;FAN Shaojia;ZHENG Jiawen;QI Xiuxiang;LI Huaiyu(Guangzhou Meteorological Observatory,Guangzhou 511430;Guangdong Meteorological Observatory,Guangzhou 510641;Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction,CMA,Guangzhou 510641;School of Atmospheric Sciences,Sun Yat-Sen University,Zhuhai 519082;Nansha Meteorological Service,Guangzhou 511458)

机构地区：[1]广州市气象台,广州511430 [2]广东省气象台,广州510641 [3]中国气象局广州热带海洋气象研究所/广东省区域数值天气预报重点实验室,广州510641 [4]中山大学大气科学学院,珠海519082 [5]广州市南沙区气象局,广州511458

出　　处：《环境科学学报》2022年第6期274-284,共11页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金重点项目(No.41630422);国家重点研发计划(No.2019YFC1510400);广东省技术创新团队项目(No.GRMCTD202002)。

摘　　要：利用2016—2019年广州增城风廓线雷达资料、地面气象站资料及附近广州九龙镇污染物浓度数据,研究了广州边界层局地回流指数R廓线对污染物浓度变化的影响,并综合分析了造成污染日或污染过程的R廓线及其阈值.结果表明,污染物浓度变化与局地回流指数R呈负相关及负滞后相关,负相关系数随高度的升高而下降.污染物NO_(2)浓度变化与局地回流指数R的负相关性最高,污染物O_(3)浓度变化与局地回流指数R的负相关性最低.不同季节、不同污染物浓度与局地回流指数R的负相关性有差异.当局地回流指数R(平均)<0.3的厚度大于400 m或至少3个高度层(每层高度差60 m)R<0.28时,发生复合型污染过程的可能性增大,同时可能出现超过7 d的长时间污染过程.Based on the wind profile radar data of Zengcheng,Guangzhou,automatic weather station data and pollutant concentration data of nearby Jiulong Town from 2016 to 2019,the influence of recirculation factor(R)profile of the Guangzhou boundary layer on the change of pollutant concentration was studied.The R profile and its threshold value of the pollution day or pollution process are comprehensively analyzed,which can help to better understand the influence of the change of wind profile in the boundary layer on the pollutant concentration.The results show that the change of pollutant concentration is negatively lagged with R and the negative correlation coefficient decreases with the increase of height.The highest negative correlation was found for NO_(2) and the lowest for O_(3).The negative correlation between pollutant concentrations and the R varied from season to season and from pollutant to pollutant.If R(average)<0.3 is thicker than 400 m or at least 3 levels(60 m difference in height per level)R<0.28,the possibility of compound pollution process increases,at the same time a long-term pollution process of more than 7 days may occur.

关 键 词：局地回流指数R 对流边界层 污染过程 风廓线雷达 广州 

分 类 号：X51[环境科学与工程—环境工程] X16