天津地区海风对大气污染物浓度的影响  

Influence of sea breeze on atmospheric pollutant concentration over Tianjin

作　　者：郝天依 陈树成 蔡子颖 单晓琳 孟丽红[4] 韩素芹[4] 东高红 HAO Tian-yi;CHEN Shu-cheng;CAI Zi-ying;SHAN Xiao-lin;MENG Li-hong;HAN Su-qin;DONG Gao-hong(Tianjin Environmental Meteorological Centre, Tianjin 300074, China;Tianjin Meteorological Observation Centre, Tianjin 300061, China;Tianjin Binhai New Area Meteorological Bureau, Tianjin 300457, China;Tianjin Institute of Meteorological Science, Tianjin 300074,China)

机构地区：[1]天津市环境气象中心,天津300074 [2]天津市气象探测中心,天津300061 [3]天津市滨海新区气象局,天津300457 [4]天津市气象科学研究所,天津300074

出　　处：《中国环境科学》2017年第9期3247-3257,共11页China Environmental Science

基　　金：天津市气象局科研项目(201736bsjj02);环保公益性行业科研专项(201409001);国家科技部科技支撑计划项目(2014BAC23B00);天津市气象局课题(201718ybxm12);天津市重大科技专项(14ZCDGSF00027)

摘　　要：采用污染物浓度监测数据、气象数据和大气化学模式WRF-CHEM分析天津地区海风对大气污染物浓度的影响.结果表明:天津地区东部沿海的空气质量优于西部内陆及城市中心.在天津地区污染天气高发的秋冬季,海风对污染物浓度起到了稀释作用,所以海风有利于天津地区大气污染的缓解,并且对城郊污染物浓度的影响相对较大,弱气压场形势下有海风存在相对于无海风时PM_(2.5)、PM_10和O3的日均浓度减幅分别为14.4μg/m^3,22.9μg/m^3和8.9μg/m^3.2015年1月4日海风过程的实例分析表明海风锋可将沿海的部分大气污染物输送至所经过的内陆地区,所以处于海风锋前的地区污染物浓度存在短暂的小幅上升,移至海风锋后部后污染物浓度呈下降趋势,市区的PM_(2.5)小时浓度由342μg/m^3上升为399μg/m^3,而后再呈下降趋势,降至160μg/m^3左右.海风有利于天津地区大气污染物的扩散,既将污染物向海风的下游方向输送,又增强了污染物的垂直扩散能力.此次过程影响范围较广,使得天津地区的大气污染得到了缓解,但并没有使大气污染物消散.The influence of sea breeze on the concentration of air pollutants in Tianjin was analyzed by using themonitoring data of pollutants concentration,meteorological data and WRF-CHEM model.Research results show that theair quality in the eastern coastal areas of Tianjin was better than that in the west inland and urban center.In the autumnand winter of high pollution weather in Tianjin,sea breeze played a role in reducing the concentration of pollutants.Therefore,the sea breeze was beneficial to reduce the air pollution,and the impact on the concentration of pollutants inthe suburbs was relatively obvious.The daily average concentration of pollutants was lower in the presence of sea breezethan that without sea breeze in weak pressure field.The daily average concentration reduction of PM2.5,PM10and O3were14.4μg/m3,22.9μg/m3and8.9μg/m3respectively.The sea breeze episode in January4,2015shows that the pollutants inthe coastal area could be moved to the inland areas by sea breeze front.The pollutants concentration increased slightly inthe front of the sea breeze front.When the sea breeze front moved,the pollutants concentration showed a downward trend.As a result of the wider impact of this sea breeze process,air pollution in Tianjin has been eased.

关 键 词：天津 海风 大气污染 

分 类 号：X51[环境科学与工程—环境工程]