摘要
利用Models-3/CMAQ模式系统对北京市2013~2018年秋冬季(即当年11、12月和次年1、2月份)细颗粒物(PM_(2.5))进行模拟,计算北京周边4个截面的PM_(2.5)传输通量,结合流场、浓度的分析,总结11种大气环流型下北京市的PM_(2.5)传输特征.污染严重的西南(SW)和西(W)环流型下,北京地区受强烈的PM_(2.5)传输作用,0.6km以下南部平原的输入产生了非常强的输入累积作用,加重了北京地区PM_(2.5)的污染程度.污染严重的南(S)环流型下,0.6km以下东部平原和0.6km以上南部平原的输入都产生了较强的输入累积作用,京津冀东部和南部地区的污染物通过不同高度范围传输影响北京地区的PM_(2.5)水平.污染同样严重的均压(UM)和气旋(C)环流型下,各方向的传输都没有产生明显的输入累积作用,本地排放的削减对于污染的控制尤为重要.污染中等的东(E)、东南(SE)环流型下,北京地区在近地层(0.2km以下)通过南部平原截面对保定等城市有较大的输出通量,对北京污染具有较强的输出消散作用.污染轻的北(N)、东北(NE)和西北(NW)环流型下,北京地区在1km以下通过东部平原截面对廊坊、天津等城市有很大的输出通量,对北京污染具有很强的输出消散作用.污染轻的A环流型下,北京地区没有明显的PM_(2.5)输入输出现象.
Models-3/CMAQ was applied to simulate fine particulate matter(PM_(2.5))during autumn and winter(Nov.-Feb.,2013~2018)in Beijing,and was used to calculate PM_(2.5) transport flux on four cross sections around Beijing,which can combine with flow field and concentration to investigate PM_(2.5) transport characteristics in 11 atmospheric circulation types in Beijing.In heavy polluted southwest(SW)and west(W)circulation types,PM_(2.5) strong transport suffered Beijing,the input flux from the southern plain had very strong input accumulation effect below 0.6km,which increased the pollution level of PM_(2.5) in Beijing.In heavy polluted south(S)circulation type,the input flux of the eastern plain below 0.6km and the input flux of the southern plain above 0.6km had strong input accumulation effect,so PM_(2.5) transport from eastern and southern areas of Beijing-Tianjin-Hebei region in different altitude ranges affect PM_(2.5) level in Beijing.In uniform pressure fields(UM)and cyclone(C)circulation types,transport in all directions had no obvious input accumulation effect,so the reduction of local emissions was particularly important for pollution control.In moderately polluted east(E)and southeast(SE)circulation types,Beijing had a large output flux below 0.2km to the northern cities such as Baoding through the southern plain section,which had strong output dissipation effect on Beijing pollution.In clean northern(N),northeast(NE)and northwest(NW)circulation types,Beijing had a very large output flux below 1km to the eastern cities such as Langfang and Tianjin through the eastern plain section,which had very strong output dissipation effect on Beijing pollution.In clean polluted anticyclone(A)circulation type,Beijing had no obvious PM_(2.5) input and output phenomena.
作者
林廷坤
屈坤
严宇
王雪松
赵宁
LIN Ting-kun;QU Kun;YAN Yu;WANG Xue-song;ZHAO Ning(State Key Joint Laboratory of Environmental Simulation and Pollution Control,College of Environmental Sciences and Engineering,Peking University,Beijing 100871,China;China Southern Power Grid Technology Co.,Ltd.,Guangzhou,Guangdong 510080,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2021年第2期548-557,共10页
China Environmental Science
基金
国家重点研发计划(2018YFC0213204)。
关键词
环流型
细颗粒物
CMAQ
传输通量
北京
circulation type
fine particulate matter
CMAQ
transport flux
Beijing
