Knowledge Management System Of Institute of Earth Environment, CAS
| Vertical observations of the atmospheric boundary layer structure over Beijing urban area during air pollution episodes | |
| Wang, Linlin1,2; Liu, Junkai1,5; Gao, Zhiqiu1; Li, Yubin2; Huang, Meng2; Fan, Sihui2; Zhang, Xiaoye3; Yang, Yuanjian2,6; Miao, Shiguang4; Zou, Han1; Sun, Yele1; Chen, Yong1; Yang, Ting1 | |
| Corresponding Author | Gao, Zhiqiu(zgao@mail.iap.ac.cn) |
| 2019-05-23 | |
| Source Publication | ATMOSPHERIC CHEMISTRY AND PHYSICS
 |
| ISSN | 1680-7316 |
| Volume | 19Issue:10Pages:6949-6967 |
| Abstract | We investigated the interactions between the air pollutants and the structure of the urban boundary layer (UBL) over Beijing by using the data mainly obtained from the 325m meteorological tower and a Doppler wind lidar during 1-4 December 2016. Results showed that the pollution episodes in this period could be characterized by low surface pressure, high relative humidity, weak wind, and temperature inversion. Compared with a clean daytime episode that took place on 1 December, results also showed that the attenuation ratio of downward shortwave radiation was about 5 %, 24% and 63% in afternoon hours (from 12:00 to 14:00 local standard time, LST) on 2-4 December, respectively, while for the net radiation (R n) attenuation ratio at the 140m level of the 325m tower was 3 %, 27% and 68 %. The large reduction in R n on 4 December was not only the result of the aerosols, but also clouds. Based on analysis of the surface energy balance at the 140m level, we found that the sensible heat flux was remarkably diminished during daytime on polluted days and even negative after sunrise (about 07: 20 LST) till 14: 00 LST on 4 December. We also found that heat storage in the urban surface layer played an important role in the exchange of the sensible heat flux. Owing to the advantages of the wind lidar having superior spatial and temporal resolution, the vertical velocity variance could capture the evolution of the UBL well. It clearly showed that vertical mixing was negatively related to the concentrating of pollutants, and that vertical mixing would also be weakened by a certain quantity of pollutants, and then in turn worsened the pollution further. Compared to the clean daytime on 1 December, the maximums of the boundary layer height (BLH) decreased about 44% and 56% on 2- 3 December, when the average PM2.5 (PM1) concentrations in afternoon hours (from 12:00 to 14:00 LST) were 44 (48) mu g m(-3) and 150 (120) mu g m(-3). Part of these reductions of the BLH was also contributed by the effect of the heat storage in the urban canopy. |
| DOI | 10.5194/acp-19-6949-2019 |
| WOS Keyword | NORTH CHINA PLAIN ; SURFACE-ENERGY BALANCE ; ANTHROPOGENIC HEAT ; SEVERE HAZE ; METEOROLOGICAL CONDITIONS ; AEROSOL POLLUTION ; SEVERE FOG ; IMPACT ; PM2.5 ; EVENT |
| Indexed By | SCI ; SCI |
| Language | 英语 |
| Funding Project | National Key Research and Development Program of Ministry of Science and Technology of China[2016YFC0203304] ; National Key Research and Development Program of Ministry of Science and Technology of China[2017YFC0209601] ; State Key Laboratory of Loess and Quaternary Geology[SKLLQG1842] |
| WOS Research Area | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
| Funding Organization | National Key Research and Development Program of Ministry of Science and Technology of China ; State Key Laboratory of Loess and Quaternary Geology |
| WOS Subject | Environmental Sciences ; Meteorology & Atmospheric Sciences |
| WOS ID | WOS:000468810000005 |
| Publisher | COPERNICUS GESELLSCHAFT MBH |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ieecas.cn/handle/361006/13914 |
| Collection | 黄土与第四纪地质国家重点实验室（2010~） |
| Corresponding Author | Gao, Zhiqiu |
| Affiliation | 1.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China 2.Nanjing Univ Informat Sci & Technol, Sch Atmospher Phys, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Nanjing 210044, Jiangsu, Peoples R China 3.Chinese Acad Meteorol Sci, Beijing 100081, Peoples R China 4.China Meteorol Adm, Inst Urban Meteorol, Beijing 100081, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China |
| Recommended Citation GB/T 7714 | Wang, Linlin,Liu, Junkai,Gao, Zhiqiu,et al. Vertical observations of the atmospheric boundary layer structure over Beijing urban area during air pollution episodes[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019,19(10):6949-6967. |
| APA | Wang, Linlin.,Liu, Junkai.,Gao, Zhiqiu.,Li, Yubin.,Huang, Meng.,...&Yang, Ting.(2019).Vertical observations of the atmospheric boundary layer structure over Beijing urban area during air pollution episodes.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(10),6949-6967. |
| MLA | Wang, Linlin,et al."Vertical observations of the atmospheric boundary layer structure over Beijing urban area during air pollution episodes".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.10(2019):6949-6967. |
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