2016年1月京津冀地区大气污染特征与多尺度传输量化评估  

Air Pollution Characteristics and Quantitative Evaluation of Multi-scale Transport in the Beijing-Tianjin-Hebei Region in January,2016

作　　者：姚森 张晗宇 王晓琦[2] 杨书申[1] YAO Sen;ZHANG Han-yu;WANG Xiao-qi;YANG Shu-shen(School of Energy and Environment,Zhongyuan University of Technology,Zhengzhou 450007,China;Key Laboratory of Beijing on Regional Air Pollution Control,College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]中原工学院能源与环境学院,郑州450007 [2]北京工业大学环境与能源工程学院,区域大气复合污染防治北京市重点实验室,北京100124

出　　处：《环境科学》2021年第2期534-545,共12页Environmental Science

基　　金：中国博士后科学基金项目(71005011201901);国家自然科学基金项目(41375145)。

摘　　要：基于大气环境监测数据和WRF-CAMx模式,分析了2016年1月京津冀城市的大气污染特征,开展了PM_(2.5)跨界传输量化评估研究.结果表明,2016年1月京津冀地区PM_(2.5)、PM_(10)、SO_(2)、NO_(2)和CO的平均浓度分别为89.5μg·m^(-3)、135.61μg·m^(-3)、57.55μg·m^(-3)、60.79μg·m^(-3)和2.12 mg·m^(-3),其中PM_(2.5)污染较为严峻.研究期间,京津冀城市近地面PM_(2.5)以本地排放为主,贡献率为45.4%~69.9%;区域传输贡献为辅,其中来自京津冀区域内和区域外的传输贡献率分别为4.8%~49.7%和4.9%~29.6%.高风速会促进本地PM_(2.5)污染的扩散,同时位于其上风向污染较高的城市,在高风速和强下风向频率和的作用下,会进一步增强对下风向城市的区域传输贡献.北京(石家庄)PM_(2.5)总流入、流出和净通量(t·d^(-1))分别为1582.96(2036.89)、-1171.09(-1879.12)和411.87(157.77),表明两城市接受外来输入影响均高于向外传输的影响.PM_(2.5)净通量呈现显著的垂直分布特征,离地1782 m高度范围内北京和石家庄PM_(2.5)总净通量强度范围分别是17.86~64.18t·d^(-1)和-2.95~134.81 t·d^(-1),均在距地面817 m左右达到峰值,强度分别为64.18 t·d^(-1)和134.81 t·d^(-1),而张家口和山西的净流入通量的显著增加是导致两城市PM_(2.5)总净通量强度达到峰值的主要原因.Based on atmospheric monitoring data and the WRF-CAMx model,this study analyzed the characteristics of air pollution and performed a quantitative assessment of PM_(2.5) cross-border transport in the Beijing-Tianjin-Hebei(BTH)region in January 2016.The results showed that the average concentrations of PM_(2.5),PM10,SO_(2),NO_(2),and CO were 89.5μg·m^(-3),135.61μg·m^(-3),57.55μg·m^(-3),60.79μg·m^(-3),and 2.12 mg·m^(-3),respectively,indicating severe PM_(2.5) pollution.During the study period,surface-level PM_(2.5) in each city of BTH region was dominated by local emissions,which accounted for 45.4%to 69.9%.The regional transport contribution was supplemented by transport from within and outside of the BTH region,accounting for 4.8%to 49.7%and 4.9%to29.6%,respectively.In addition,high wind speeds promoted the diffusion of local PM_(2.5) pollution and cities with high upwind pollution enhance regional-scale transport to downwind cities.The total inflow,outflow,and net flux of PM_(2.5) in Beijing(Shijiazhuang)in January 2016 were 1582.96 t·d^(-1)(2036.89 t·d^(-1)),-1171.09 t·d^(-1)(-1879.12 t·d^(-1)),and 411.87 t·d^(-1)(157.77 t·d^(-1)),respectively,indicating that PM_(2.5) inputs from surrounding cities per unit time were higher than external inputs to the surrounding cities.Furthermore,net PM_(2.5) flux showed notable vertical evolution;the total net flux of PM_(2.5) in Beijing and Shijiazhuang below 1782 m ranged from 17.86 to 64.18 t·d^(-1) and-2.95 to 134.81 t·d^(-1),respectively,and both peaked 817 m above the ground at 64.18 and 134.81 t·d^(-1).Moreover,a significant increase the net PM_(2.5) inflow flux in Zhangjiakou and Shanxi explained the observed net flux peaks in these two cities.

关 键 词：大气污染特征 气象-空气质量模式(WRF-CAMx) PM_(2.5)传输矩阵 PM_(2.5)传输通量 京津冀地区 

分 类 号：X51[环境科学与工程—环境工程]