Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017JD027709 |
Changes in Atmospheric Butanes and Pentanes and Their Isomeric Ratios in the Continental United States | |
Rossabi, Sam; Helmig, Detlev | |
2018-04-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:7页码:3772-3790 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Nonmethane hydrocarbons have been used as tracers in research on emissions and atmospheric oxidation chemistry. This research investigates source region mixing ratio trends of the nonmethane hydrocarbons i-butane, n-butane, i-pentane, and n-pentane, and the (i/n) isomeric ratios of these compounds between 2001 and 2015. Data collected at Photochemical Assessment Monitoring Stations, mandated by the U.S. Environmental Protection Agency in ozone nonattainment areas, and data collected at Global Greenhouse Gas Reference Network sites within the National Oceanic and Atmospheric Administration network, and analyzed at the Institute of Arctic and Alpine Research at the University of Colorado-Boulder, were examined. Among all considered species, linear regression analyses on concentration time series had negative slopes at 81% of sites, indicating predominantly declining butane and pentane atmospheric concentrations. Mostly negative slopes (78% of sites) were found for the (i/n) butane and pentane isomeric ratios, including all six and seven statistically significant (i/n) butane and pentane trends, respectively. Over the similar to 15year investigation period and averaged over all sites, total relative changes were similar to 30 and 45% for the (i/n) ratios of butanes and pentanes, respectively, with a relative increase in the prominence of the n-isomers. Most likely causes include changing isomeric ratios in gasoline sector emissions, and increasing influence of oil and natural gas industry emissions. Changes in concentrations and isomeric ratios depend on proximity of contributing emission sources to measurement sites. |
英文关键词 | isomeric ratio butanes pentanes trends atmospheric |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000430786500024 |
WOS关键词 | VOLATILE ORGANIC-COMPOUNDS ; PHASE TROPOSPHERIC CHEMISTRY ; REGIONAL AIR-QUALITY ; NONMETHANE HYDROCARBONS ; NATURAL-GAS ; FIRN AIR ; RADICAL CONCENTRATIONS ; RURAL TROPOSPHERE ; RECENT DECREASES ; NORTH-ATLANTIC |
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/32653 |
专题 | 气候变化 |
作者单位 | Univ Colorado Boulder, Inst Arctic & Alpine Res INSTAAR, Boulder, CO 80309 USA |
推荐引用方式 GB/T 7714 | Rossabi, Sam,Helmig, Detlev. Changes in Atmospheric Butanes and Pentanes and Their Isomeric Ratios in the Continental United States[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(7):3772-3790. |
APA | Rossabi, Sam,&Helmig, Detlev.(2018).Changes in Atmospheric Butanes and Pentanes and Their Isomeric Ratios in the Continental United States.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(7),3772-3790. |
MLA | Rossabi, Sam,et al."Changes in Atmospheric Butanes and Pentanes and Their Isomeric Ratios in the Continental United States".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.7(2018):3772-3790. |
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