PM_(2.5)空中输送对北京地面污染影响的地形强迫机制模拟研究  

Simulation of the topographic forcing mechanism in the effects of airborne transport of PM on surface air pollution in Beijing

作　　者：金莲姬[1] 刘峥 朱彬[1] 赵德龙[2] 翟晴飞[3] 田平[2] 丁德平[2] JIN Lianji;LIU Zheng;ZHU Bin;ZHAO Delong;ZHAI Qingfei;TIAN Ping;DING Deping(Key Laboratory of Meteorological Disaster,Ministry of Education(KLME),Joint International Research Laboratory of Climate and Environment Change(ILCEC),Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),CMA Key Laboratory for Aerosol-Cloud-Precipitation,Nanjing University of Information Science&Technology,Nanjing 210044;Beijing Weather Modification Office,Beijing 100089;Liaoning Weather Modification Office,Shenyang 110166)

机构地区：[1]南京信息工程大学气象灾害教育部重点实验室,气候与环境变化国际合作联合实验室,气象灾害预报预警与评估协同创新中心,中国气象局气溶胶与云降水重点开放实验室,南京210044 [2]北京市人工影响天气办公室,北京100089 [3]辽宁省人工影响天气办公室,沈阳110166

出　　处：《环境科学学报》2021年第8期2976-2986,共11页Acta Scientiae Circumstantiae

基　　金：国家重点研发计划课题(No.2016YFA0602003,2016YFA0602001);辽宁省自然科学基金(No.2019-MS-199)。

摘　　要：近几十年来随着工业化和城市化进程的加快,在我国许多城市都出现了严重的PM_(2.5)污染问题.PM_(2.5)污染形成机制研究可以为其预报及治理工作提供基础.选择了具有飞机观测资料的2016年12月10—13日北京冬季典型的PM_(2.5)严重污染个例作为研究对象,利用WRF-Chem对该个例进行了数值模拟,分析了PM_(2.5)空中输送对北京地面PM_(2.5)浓度影响的地形强迫机制在模拟结果中的具体表现方式.数值模拟结果表明:(1)通过北京南边界进入北京的PM_(2.5)最大输送高度为600 m(ASL)左右;(2)从空中被输送至燕山的PM_(2.5),可以爬坡过山后增大怀柔区燕山东坡的浓度,还可以在夜间有下坡风时随着下坡风到山脚,然后再向南输送到北京燕山以南的平地.With the acceleration of industrialization and urbanization in recent decades,some serious air pollution events of PM_(2.5)have appeared in many cities over China.The study on the formation mechanism of PM_(2.5)pollution can provide the basis for its prediction and treatment.With aircraft observation,the process of a severe pollution event during December 10—13,2016 was selected as a typical PM_(2.5)pollution case in winter over Beijing.The topographic forcing mechanism in the effects of airborne transport of PM_(2.5)on the surface PM_(2.5)concentration in Beijing was simulated and analyzed using WRF-Chem model.The modeling shows that the maximum height of PM_(2.5)transported through the southern boundary of Beijing is about 600 m(ASL).PM_(2.5)transported via the air can increase the surface PM_(2.5)concentration at the eastern slope of Yanshan Mountain in Huairou District after climbing over the mountains.It can also be transported to the foot of the mountain along downhill wind at night,and then transported to the flat land to the south of Yanshan Mountain in Beijing.

关 键 词：北京 PM_(2.5)污染 形成机制 平流输送 地形 数值模拟 

分 类 号：X513[环境科学与工程—环境工程]