海陆风环流和城市热岛环流相互作用及其对空气污染的影响  

The interaction between sea⁃land breeze circulation and urban heat island circulation as well as their effects on air pollution

作　　者：王鑫宇 刘红年[1] 俞布[2] Wang Xinyu;Liu Hongnian;Yu Bu(School of Atmospheric Sciences,Nanjing University,Nanjing,210023,China;Hangzhou Meteorological Administration,Hangzhou,310008,China)

机构地区：[1]南京大学大气科学学院,南京210023 [2]杭州市气象局,杭州310008

出　　处：《南京大学学报（自然科学版）》2023年第4期713-721,共9页Journal of Nanjing University（Natural Science）

基　　金：国家自然科学基金(41975004)。

摘　　要：沿海城市的PM_(2.5)和臭氧除受排放源、天气条件影响以外,还往往同时受城市热岛环流和海陆风环流的双重影响.利用2015年杭州市气象和环境监测数据以及数值模式RBLM-Chem,分析研究了杭州市在陆风天气、海风天气和海陆风三种环流条件下污染物浓度特征及城市效应对其的影响.得到了以下主要结论:海风使杭州市污染物浓度增大,在观测数据中PM_(2.5)浓度和臭氧浓度分别最大增高了10.9μg·m^(-3)和12.0μg·m^(-3),在模拟结果中相比于陆风天气型,海陆风天气型的PM_(2.5)浓度和臭氧浓度分别增大13.1μg·m^(-3)和18.9μg·m^(-3);相比于海风天气型,海陆风天气型的PM_(2.5)浓度和臭氧浓度分别减小24.1μg·m^(-3)和11.6μg·m^(-3).城市效应导致杭州市边界层高度增加63.8 m,地面风速减小0.99 m·s^(-1),地面气温增高1.14℃,PM_(2.5)浓度增大2.86μg·m^(-3),臭氧浓度增大10.2μg·m^(-3).海风削弱了杭州的城市效应,城市对边界层高度、地面风速、地面气温和臭氧浓度的影响分别减小11.2 m,0.49 m·s^(-1),0.26℃和7%.Besides emission sources and weather conditions,PM_(2.5)and ozone in coastal urban areas can be influenced by the sea⁃land breeze circulation and the urban heat island circulation.By using the meteorological and environmental observation data of Hangzhou,2015,and the RBLM⁃Chem model,the features of the pollutants in Land⁃Breeze(LB),Sea⁃Breeze(SB)and Sea⁃Land Breeze(SLB)three different circulation conditions and urban surface and no⁃urban surface two surface conditions are studied.Main conclusions are as following:during sea breeze,the concentrations of PM_(2.5)and ozone are increased.In statistical results,the maximum increase are 12.0μg·m^(-3)and 10.9μg·m^(-3)respectively.In simulated results,compared with LB,in SLB the average concentrations are increased by 13.1μg·m^(-3)and 18.9μg·m^(-3)respectively;compared with SB,in SLB the average concentrations are increased by 24.1μg·m^(-3)and 11.6μg·m^(-3)respectively.Urban effect increases the boundary layer height by 63.8 m,decreases surface wind speed by 0.99 m·s^(-1),increases the surface air temperature by 1.14℃and increases the concentrations of PM_(2.5)and ozone by 2.86 and 10.2μg·m^(-3)respectively.Urban effect is weakened in Hangzhou during sea breeze,its impacts on boundary layer height,surface wind speed,surface temperature and ozone concentration are decreased by 11.2 m,0.49 m·s^(-1),0.26℃and 7%,respectively.

关 键 词：海风效应 城市效应 空气污染 

分 类 号：P49[天文地球—大气科学及气象学]