气候变化领域集成服务门户(CCPortal): Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP

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DOI	10.5194/acp-20-12905-2020
	Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP
	Stevenson D.S.; Zhao A.; Naik V.; O'Connor F.M.; Tilmes S.; Zeng G.; Murray L.T.; Collins W.J.; Griffiths P.T.; Shim S.; Horowitz L.W.; Sentman L.T.; Emmons L.
发表日期	2020
ISSN	16807316
起始页码	12905
结束页码	12920
卷号	20 期号:21
英文摘要	We analyse historical (1850-2014) atmospheric hydroxyl (OH) and methane lifetime data from Coupled Model Intercomparison Project Phase 6 (CMIP6)/Aerosols and Chemistry Model Intercomparison Project (AerChemMIP) simulations. Tropospheric OH changed little from 1850 up to around 1980, then increased by around 9andthinsp;% up to 2014, with an associated reduction in methane lifetime. The model-derived OH trends from 1980 to 2005 are broadly consistent with trends estimated by several studies that infer OH from inversions of methyl chloroform and associated measurements; most inversion studies indicate decreases in OH since 2005. However, the model results fall within observational uncertainty ranges. The upward trend in modelled OH since 1980 was mainly driven by changes in anthropogenic near-term climate forcer emissions (increases in anthropogenic nitrogen oxides and decreases in CO). Increases in halocarbon emissions since 1950 have made a small contribution to the increase in OH, whilst increases in aerosol-related emissions have slightly reduced OH. Halocarbon emissions have dramatically reduced the stratospheric methane lifetime by about 15andthinsp;%-40andthinsp;%; most previous studies assumed a fixed stratospheric lifetime. Whilst the main driver of atmospheric methane increases since 1850 is emissions of methane itself, increased ozone precursor emissions have significantly modulated (in general reduced) methane trends. Halocarbon and aerosol emissions are found to have relatively small contributions to methane trends. These experiments do not isolate the effects of climate change on OH and methane evolution; however, we calculate residual terms that are due to the combined effects of climate change and non-linear interactions between drivers. These residual terms indicate that non-linear interactions are important and differ between the two methodologies we use for quantifying OH and methane drivers. All these factors need to be considered in order to fully explain OH and methane trends since 1850; these factors will also be important for future trends. © Author(s) 2020.
语种	英语
scopus关键词	aerosol; atmospheric chemistry; computer simulation; hydroxyl radical; methane; numerical model; trend analysis; troposphere
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/143845
作者单位	School of GeoSciences, University of EdinburghEH9 3FF, United Kingdom; Department of Meteorology, University of Reading, United Kingdom; National Centre for Atmospheric Science, University of Reading, United Kingdom; National Oceanic and Atmospheric Administration (NOAA), Geophysical Fluid Dynamics Laboratory (GFDL), Princeton, NJ 08540, United States; Met Office Hadley Centre, Exeter, United Kingdom; Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, United States; National Institute of Water and Atmospheric Research (NIWA), Wellington, New Zealand; Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY, United States; National Centre for Atmospheric Science, University of Cambridge, United Kingdom; Department of Chemistry, University of Cambridge, United Kingdom; National Institute of Meteorological Sciences, Seogwipo-si, Jeju-do, South Korea
推荐引用方式 GB/T 7714	Stevenson D.S.,Zhao A.,Naik V.,et al. Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP[J],2020,20(21).
APA	Stevenson D.S..,Zhao A..,Naik V..,O'Connor F.M..,Tilmes S..,...&Emmons L..(2020).Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP.Atmospheric Chemistry and Physics,20(21).
MLA	Stevenson D.S.,et al."Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP".Atmospheric Chemistry and Physics 20.21(2020).