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	The possible contribution of the periodic emissions from farmers' activities in the north china plain to atmospheric water-soluble ions in beijing
	Liu, Pengfei1,2; Zhang, Chenglong1,2; Mu, Yujing1,2,3; Liu, Chengtang1,2; Xue, Chaoyang1,2; Ye, Can1,2; Liu, Junfeng1,2; Zhang, Yuanyuan1,2; Zhang, Hongxing1,4
刊名	Atmospheric chemistry and physics
	2016-08-11
卷号	16期号:15页码:10097-10109
ISSN号	1680-7316
DOI	10.5194/acp-16-10097-2016
通讯作者	Mu, yujing(yjmu@rcees.ac.cn)
英文摘要	The north china plain (ncp), which includes beijing, is currently suffering from severe haze events due to a high pollution level of pm2 :5. to mitigate the serious pollution problem, identification of the sources of pm2 :5 is urgently needed for the effective control measures. daily samples of pm2 :5 were collected in beijing city and in a rural area in baoding, hebei province through the year of 2014, and the seasonal variation of water-soluble ions (wsis) in pm2 :5 was comprehensively analysed to determine their possible sources. the results indicated that the periodic emissions from farmers' activities made a significant contribution to the atmospheric wsis in beijing. the relatively high concentration of k c in winter and autumn at the two sampling sites confirmed that crop straw burning contributed to atmospheric k c in beijing. the remarkable elevation of cl at the two sampling sites as well as the evident increase of the cl = k c ratio and the cl proportion in wsis during the winter in beijing could be ascribed to coal combustion for heating by farmers. the unusually high ratio of cl to na c in summer, the obviously high concentrations of cl in the rural sampling site and the elevation of cl proportion in wsis in beijing during the maize fertilization could be explained by the use of the prevailing fertilizer of nh4cl in the vast area of ncp. the abnormally high concentrations of ca-2+ at the two sampling sites and the elevation of ca-2 c proportion during the period of the maize harvest and soil ploughing in beijing provided convincing evidence that the intensive agricultural activities in autumn contributed to the regional mineral dust. the most serious pollution episodes in autumn were coincident with significant elevation of ca-2 c, indicating that the mineral dust emission from the harvest and soil ploughing not only increased the atmospheric concentrations of the primary pollutants, but also greatly accelerated formation of sulfate and nitrate through heterogeneous reactions of no2 and so2 on the mineral dust. the backward trajectories also indicated that the highest concentrations of wsis usually occurred in the air parcel from southwest-south regions, which have a high density of farmers. in addition, the values of nitrogen oxidation ratio (nor) and the sulfur oxidation ratio (sor) were found to be much greater under haze days than under non-haze days, implying that formation of sulfate and nitrate was greatly accelerated through heterogeneous or multiphase reactions of no2 and so2 on pm2.5.
WOS关键词	POLYCYCLIC AROMATIC-HYDROCARBONS ; SOURCE APPORTIONMENT ; COAL COMBUSTION ; REGIONAL HAZE ; JANUARY 2013 ; CHEMICAL CHARACTERISTICS ; PARTICULATE POLLUTION ; CARBONACEOUS AEROSOL ; SECONDARY FORMATION ; FORMATION MECHANISM
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000383177600002
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2376208
专题	中国科学院大学
通讯作者	Mu, Yujing
作者单位	1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Urban Atmospher Environm, Xiamen 361021, Peoples R China 4.Beijing Urban Ecosyst Res Stn, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Liu, Pengfei,Zhang, Chenglong,Mu, Yujing,et al. The possible contribution of the periodic emissions from farmers' activities in the north china plain to atmospheric water-soluble ions in beijing[J]. Atmospheric chemistry and physics,2016,16(15):10097-10109.
APA	Liu, Pengfei.,Zhang, Chenglong.,Mu, Yujing.,Liu, Chengtang.,Xue, Chaoyang.,...&Zhang, Hongxing.(2016).The possible contribution of the periodic emissions from farmers' activities in the north china plain to atmospheric water-soluble ions in beijing.Atmospheric chemistry and physics,16(15),10097-10109.
MLA	Liu, Pengfei,et al."The possible contribution of the periodic emissions from farmers' activities in the north china plain to atmospheric water-soluble ions in beijing".Atmospheric chemistry and physics 16.15(2016):10097-10109.

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