Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-17-8269-2017 |
Changes to the chemical state of the Northern Hemisphere atmosphere during the second half of the twentieth century | |
Newland, Mike J.1; Martinerie, Patricia2,6; Witrant, Emmanuel3; Helmig, Detlev4; Worton, David R.5; Hogan, Chris1; Sturges, William T.1; Reeves, Claire E.1 | |
2017-07-07 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:13 |
文章类型 | Article |
语种 | 英语 |
国家 | England; France; USA |
英文摘要 | The NOx (NO and NO2) and HOx (OH and HO2) budgets of the atmosphere exert a major influence on atmospheric composition, controlling removal of primary pollutants and formation of a wide range of secondary products, including ozone, that can influence human health and climate. However, there remain large uncertainties in the changes to these budgets over recent decades. Due to their short atmospheric lifetimes, NOx and HOx are highly variable in space and time, and so the measurements of these species are of limited value for examining long-term, largescale changes to their budgets. Here, we take an alternative approach by examining long-term atmospheric trends of alkyl nitrates, the production efficiency of which is dependent on the atmospheric [NO] / [HO2] ratio. We derive long-term trends in the alkyl nitrates from measurements in firn air from the NEEM site, Greenland. Their mixing ratios increased by a factor of 3-5 between the 1970s and 1990s. This was followed by a steep decline to the sampling date of 2008. Moreover, we examine how the trends in the alkyl nitrates compare to similarly derived trends in their parent alkanes (i.e. the alkanes which, when oxidised in the presence of NOx, lead to the formation of the alkyl nitrates). The ratios of the alkyl nitrates to their parent alkanes increased from around 1970 to the late 1990s. This is consistent with large changes to the [NO] / [HO2] ratio in the Northern Hemisphere atmosphere during this period. Alternatively, they could represent changes to concentrations of the hydroxyl radical, OH, or to the transport time of the air masses from source regions to the Arctic. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000405301600003 |
WOS关键词 | VOLATILE ORGANIC-COMPOUNDS ; LINE OZONE CONCENTRATIONS ; LONG-TERM CHANGES ; NONMETHANE HYDROCARBONS ; CARBON-MONOXIDE ; ALKYL NITRATES ; POLLUTION TRANSPORT ; HYDROXYL RADICALS ; RECENT DECREASES ; NITROGEN-OXIDES |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; 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/26215 |
专题 | 地球科学 |
作者单位 | 1.Univ East Anglia, Sch Environm Sci, Ctr Ocean & Atmospher Sci, Norwich, Norfolk, England; 2.Univ Grenoble Alpes, LGGE, CNRS, F-38000 Grenoble, France; 3.Univ Grenoble Alpes, CNRS, GIPSA Lab, F-38000 Grenoble, France; 4.Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO USA; 5.Natl Phys Lab, Teddington, Middx, England; 6.Univ York, Wolfson Atmospher Chem Labs, Dept Chem, York, N Yorkshire, England |
推荐引用方式 GB/T 7714 | Newland, Mike J.,Martinerie, Patricia,Witrant, Emmanuel,et al. Changes to the chemical state of the Northern Hemisphere atmosphere during the second half of the twentieth century[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(13). |
APA | Newland, Mike J..,Martinerie, Patricia.,Witrant, Emmanuel.,Helmig, Detlev.,Worton, David R..,...&Reeves, Claire E..(2017).Changes to the chemical state of the Northern Hemisphere atmosphere during the second half of the twentieth century.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(13). |
MLA | Newland, Mike J.,et al."Changes to the chemical state of the Northern Hemisphere atmosphere during the second half of the twentieth century".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.13(2017). |
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