| DOI: | 10.1038/ngeo1964
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| 论文题名: | Experimental evidence for efficient hydroxyl radical regeneration in isoprene oxidation |
| 作者: | Fuchs H.; Hofzumahaus A.; Rohrer F.; Bohn B.; Brauers T.; Dorn H.-P.; Häseler R.; Holland F.; Kaminski M.; Li X.; Lu K.; Nehr S.; Tillmann R.; Wegener R.; Wahner A.
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| 刊名: | Nature Geoscience
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| ISSN: | 17520894
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| 出版年: | 2013
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| 卷: | 6, 期:12 | | 起始页码: | 1023
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| 结束页码: | 1026
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| 语种: | 英语
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| Scopus关键词: | concentration (composition)
; experimental study
; hydroxyl radical
; isoprene
; oxidation
; volatile organic compound
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| 英文摘要: | Most pollutants in the Earth's atmosphere are removed by oxidation with highly reactive hydroxyl radicals. Field measurements have revealed much higher concentrations of hydroxyl radicals than expected in regions with high loads of the biogenic volatile organic compound isoprene. Different isoprene degradation mechanisms have been proposed to explain the high levels of hydroxyl radicals observed. Whether one or more of these mechanisms actually operates in the natural environment, and the potential impact on climate and air quality, has remained uncertain. Here, we present a complete set of measurements of hydroxyl and peroxy radicals collected during isoprene-oxidation experiments carried out in an atmospheric simulation chamber, under controlled atmospheric conditions. We detected significantly higher concentrations of hydroxyl radicals than expected based on model calculations, providing direct evidence for a strong hydroxyl radical enhancement due to the additional recycling of radicals in the presence of isoprene. Specifically, our findings are consistent with the unimolecular reactions of isoprene-derived peroxy radicals postulated by quantum chemical calculations. Our experiments suggest that more than half of the hydroxyl radicals consumed in isoprene-rich regions, such as forests, are recycled by these unimolecular reactions with isoprene. Although such recycling is not sufficient to explain the high concentrations of hydroxyl radicals observed in the field, we conclude that it contributes significantly to the oxidizing capacity of the atmosphere in isoprene-rich regions. © 2013 Macmillan Publishers Limited. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/106653
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| Appears in Collections: | 气候减缓与适应
科学计划与规划
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作者单位: | Institute of Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum Jülich GmbH, Jülich 52325, Germany
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| Recommended Citation: | |
Fuchs H.,Hofzumahaus A.,Rohrer F.,et al. Experimental evidence for efficient hydroxyl radical regeneration in isoprene oxidation[J]. Nature Geoscience,2013-01-01,6(12)
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