Impacts of HOx regeneration and recycling in the oxidation of isoprene: Consequences for the composition of past, present and future atmospheres

被引：68

作者：

Archibald, A. T. ^{[1
,6
]}

Levine, J. G. ^{[5
]}

Abraham, N. L. ^{[1
,6
]}

Cooke, M. C. ^{[2
]}

Edwards, P. M. ^{[3
]}

Heard, D. E. ^{[1
,3
]}

Jenkin, M. E. ^{[1
,2
]}

Karunaharan, A. ^{[4
]}

Pike, R. C. ^{[6
]}

Monks, P. S. ^{[1
,4
]}

Shallcross, D. E. ^{[2
]}

Telford, P. J. ^{[1
,6
]}

Whalley, L. K. ^{[1
,3
]}

Pyle, J. A. ^{[1
,6
]}

机构：

[1] Natl Ctr Atmospher Sci, Cambridge, England

[2] Univ Bristol, Atmospher Chem Res Grp, Sch Chem, Bristol BS8 1TS, Avon, England

[3] Univ Leeds, Sch Chem, Leeds LS2 9JT, W Yorkshire, England

[4] Univ Leicester, Dept Chem, Leicester LE1 7RH, Leics, England

[5] British Antarctic Survey, Cambridge CB3 0ET, England

[6] Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England

来源：

GEOPHYSICAL RESEARCH LETTERS | 2011年 / 38卷

关键词：

TROPICAL OZONE CLIMATOLOGY; TROPOSPHERIC OZONE; EMISSIONS; FOREST; CHEMISTRY; CAMPAIGN; BUDGETS; SUMMER; MODEL;

D O I：

10.1029/2010GL046520

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

A global chemistry-climate model is used to assess the impact on atmospheric composition of the regeneration and recycling of HOx in the photo-oxidation of isoprene. The impact is explored subject to present-day, pre-industrial and future climate/emission scenarios. Our calculations show that, in all cases, the inclusion of uni-molecular iso-merisations of the isoprene hydroxy-peroxy radicals leads to enhanced production of HOx radicals and ozone. The global burden of ozone increases by 25-36 Tg (8-18%), depending on the climate/emissions scenario, whilst the changes in OH lead to decreases in the methane lifetime of between 11% in the future and 35% in the pre-industrial. Critically the size of the change in methane lifetime depends on the VOC/NOx emission ratio. The results of the present-day calculations suggest a certain amount of parameter refinement is still needed to reconcile the updated chemistry with field observations (particularly for HO2+RO2). However, the updated chemistry could have far-reaching implications for: future-climate predictions; projections of future oxidising capacity; and our understanding of past changes in oxidising capacity. Citation: Archibald, A. T., et al. (2011), Impacts of HOx regeneration and recycling in the oxidation of isoprene: Consequences for the composition of past, present and future atmospheres, Geophys. Res. Lett., 38, L05804, doi: 10.1029/2010GL046520.

引用

页数：6

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