Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-20-4575-2020 |
Haze pollution under a high atmospheric oxidization capacity in summer in Beijing: insights into formation mechanism of atmospheric physicochemical processes | |
Zhao, Dandan1,2; Liu, Guangjing1,3; Xin, Jinyuan1,2,4; Quan, Jiannong5; Wang, Yuesi1; Wang, Xin3; Dai, Lindong1; Gao, Wenkang1; Tang, Guiqian1; Hu, Bo1; Ma, Yongxiang1; Wu, Xiaoyan1; Wang, Lili1; Liu, Zirui1; Wu, Fangkun1 | |
2020-04-21 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2020 |
卷号 | 20期号:8页码:4575-4592 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Under a high atmospheric oxidization capacity, the synergistic effect of the physicochemical processes in the atmospheric boundary layer (ABL) caused summer haze pollution in Beijing. The southern and southwestern areas, generally 60-300 km away from Beijing, were seriously polluted in contrast to Beijing, which remained clean. Southerly winds moving faster than 20-30 km h(-1) since the early morning primarily caused haze pollution initiation. The PM2.5 (particulate matter with a dynamic equivalent diameter smaller than 2.5 mu m) level increased to 75 mu gm(-3) over several hours during the daytime, which was simultaneously affected by the ABL structure. Additionally, the O-3 concentration was quite high during the daytime (250 mu gm(-3)), corresponding to a high atmospheric oxidation capacity. Much sulfate and nitrate were produced through active atmospheric chemical processes, with sulfur oxidation ratios (SORs) up to similar to 0.76 and nitrogen oxidation ratios (NORs) increasing from 0.09 to 0.26, which further facilitated particulate matter (PM) level enhancement. However, the increase in sulfate was mainly linked to southerly transport. At midnight, the PM2.5 concentration sharply increased from 75 to 150 mu gm(-3) over 4 h and remained at its highest level until the next morning. Under an extremely stable ABL structure, secondary aerosol formation dominated by nitrate was quite intense, driving the haze pollution outbreak. The PM levels in the southern and southeastern areas of Beijing were significantly lower than those in Beijing at this time, even below air quality standards; thus, the contribution of pollution transport had almost disappeared. With the formation of a nocturnal stable boundary layer (NSBL) at an altitude ranging from 0-0.3 km, the extremely low turbulence kinetic energy (TKE) ranging from 0 to 0.05 m(2) ns(-2) inhibited the spread of particles and moisture, ultimately resulting in elevated near-surface PM2.5 and relative humidity (similar to 90 %) levels. Due to the very high humidity and ambient oxidization capacity, NOR rapidly increased from 0.26 to 0.60, and heterogeneous hydrolysis reactions at the moist particle surface were very notable. The nitrate concentration steeply increased from 11.6 to 57.8 mu g m(-3), while the sulfate and organics concentrations slightly increased by 6.1 and 3.1 mu g m(-3), respectively. With clean and strong winds passing through Beijing, the stable ABL dissipated with the potential temperature gradient becoming negative and the ABL height (ABLH) increasing to similar to 2.5 km. The high turbulence activity with a TKE ranging from 3 to 5 m(2)s(-2) notably promoted pollution diffusion. The self-cleaning capacity of the atmosphere is commonly responsible for air pollution dispersion. However, reducing the atmospheric oxidization capacity, through strengthening collaborative control of nitrogen oxide (NOx) and volatile organic compounds (VOCs), as well as continuously deepening regional joint air pollution control, is urgent. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000529310000001 |
WOS关键词 | YANGTZE-RIVER DELTA ; LAYER METEOROLOGICAL FACTORS ; AIR-QUALITY IMPROVEMENT ; TIANJIN-HEBEI REGION ; EXPLOSIVE GROWTH ; PARTICULATE NITRATE ; OZONE POLLUTION ; SEASONAL-VARIATIONS ; INORGANIC AEROSOLS ; SULFUR-DIOXIDE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/248972 |
专题 | 地球科学 |
作者单位 | 1.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China; 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China; 3.Lanzhou Univ, Coll Atmospher Sci, Lanzhou 730000, Peoples R China; 4.Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Nanjing 210044, Peoples R China; 5.Chinese Meteorol Adm, Isnt Urban Meteorol, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Zhao, Dandan,Liu, Guangjing,Xin, Jinyuan,et al. Haze pollution under a high atmospheric oxidization capacity in summer in Beijing: insights into formation mechanism of atmospheric physicochemical processes[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2020,20(8):4575-4592. |
APA | Zhao, Dandan.,Liu, Guangjing.,Xin, Jinyuan.,Quan, Jiannong.,Wang, Yuesi.,...&Wu, Fangkun.(2020).Haze pollution under a high atmospheric oxidization capacity in summer in Beijing: insights into formation mechanism of atmospheric physicochemical processes.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(8),4575-4592. |
MLA | Zhao, Dandan,et al."Haze pollution under a high atmospheric oxidization capacity in summer in Beijing: insights into formation mechanism of atmospheric physicochemical processes".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.8(2020):4575-4592. |
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