Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.atmosres.2019.104658 |
Atmospheric CH3CCl3 observations in China: Historical trends and implications | |
Yu, Dajiang1; 39;Doherty, Simon2 | |
2020 | |
发表期刊 | ATMOSPHERIC RESEARCH
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ISSN | 0169-8095 |
EISSN | 1873-2895 |
出版年 | 2020 |
卷号 | 231 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; Switzerland; England |
英文摘要 | Although CH3CCl3 is an important ozone-depleting substance regulated by the Montreal Protocol on Substances that Deplete the Ozone Layer and its Amendments, the levels of atmospheric CH3CCl3 mixing ratios in China are poorly understood. Long-term in-situ measurements by GC-ECD have been conducted at the Shangdianzi Station in northern China since October 2006. In addition, air samples have been collected daily/weekly at seven stations and analyzed by GC/MS system since 2010. The two methods show comparable precisions at around 1% and all the measurements were calibrated by standards linked to the Advanced Global Atmospheric Gases Experiment (AGAGE) reference scale Scripps Institution of Oceanography (SIO)-05. Mixing ratios for both "background" and "polluted" conditions are reported. The atmospheric CH3CCl3 mixing ratios during background conditions showed a significant and consistent decreasing trend with a decline rate from 1.9 ppt/yr (October 2006 to December 2007) to 0.3 ppt/yr (November 2015 to December 2017) at the Shangdianzi Station. Measured background mixing ratios increased from 41% in 2007 to 95% in 2017. The mean mixing ratios and their enhancement of polluted conditions have decreased from 15.1 and 2.0 ppt in 2007 to 2.7 and 0.3 ppt in 2017 at Shangdianzi. The mixing ratios in air at background conditions at the seven stations in China agree well with each other and all decrease gradually. The percentage of pollution events to the total number of measurements (POL/SUM) at Lin'an has decreased significantly from 2010 to 2017, especially after 2013. In 2017, POL/SUMs of all stations were < 8% and the enhancements above background were < 0.7 ppt. Both mixing ratios and enhancements have decreased by one or two orders of magnitude when comparing the results from previous studies, in the early 2000s, with the results in 2017 from this study. Chinese emissions of CH3CCl3, which were estimated by a tracer-ratio method, have decreased from 1.6 kt/yr in 2007 to 0.3 kt/yr in 2013, indicating that CH3CCl3 has been phased-out in China in accordance with the Montreal Protocol. |
英文关键词 | CH3CCl3 Atmospheric mixing ratios Background levels Long-term trend Emissions |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000513178000009 |
WOS关键词 | IN-SITU MEASUREMENTS ; REGIONAL BACKGROUND STATION ; PEARL RIVER DELTA ; METHYL CHLOROFORM EMISSIONS ; MIXING RATIOS ; HALOGENATED COMPOUNDS ; HALOCARBONS ; HYDROCARBONS ; VARIABILITY ; TRANSPORT |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
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/278764 |
专题 | 地球科学 |
作者单位 | 1.CMA, Longfengshan Reg Background Stn, Harbin, Heilongjiang, Peoples R China; 2.CMA, MOC, Beijing, Peoples R China; 3.Minzu Univ China, Coll Life & Environm Sci, Beijing, Peoples R China; 4.Swiss Fed Labs Mat Sci & Technol, Lab Air Pollut & Environm Technol, Empa, Dubendorf, Switzerland; 5.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing, Peoples R China; 6.CAMS, State Key Lab Severe Weather, CMA, Beijing, Peoples R China; 7.CAMS, Key Lab Atmospher Chem, CMA, Beijing, Peoples R China; 8.Zhejiang Inst Meteorol Sci, Hangzhou, Peoples R China; 9.Univ Bristol, Atmospher Chem Res Grp, Bristol, Avon, England |
推荐引用方式 GB/T 7714 | Yu, Dajiang,39;Doherty, Simon. Atmospheric CH3CCl3 observations in China: Historical trends and implications[J]. ATMOSPHERIC RESEARCH,2020,231. |
APA | Yu, Dajiang,&39;Doherty, Simon.(2020).Atmospheric CH3CCl3 observations in China: Historical trends and implications.ATMOSPHERIC RESEARCH,231. |
MLA | Yu, Dajiang,et al."Atmospheric CH3CCl3 observations in China: Historical trends and implications".ATMOSPHERIC RESEARCH 231(2020). |
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