气候变化领域集成服务门户(CCPortal): Methane Emissions in a Chemistry-Climate Model: Feedbacks and Climate Response

CCPortal

DOI	10.1029/2019MS002019
	Methane Emissions in a Chemistry-Climate Model: Feedbacks and Climate Response
	Heimann I.; Griffiths P.T.; Warwick N.J.; Abraham N.L.; Archibald A.T.; Pyle J.A.
发表日期	2020
ISSN	19422466
卷号	12 期号:10
英文摘要	Understanding the past, present, and future evolution of methane remains a grand challenge. Here we have used a hierarchy of models, ranging from simple box models to a chemistry-climate model (CCM), UM-UKCA, to assess the contemporary and possible future atmospheric methane burden. We assess two emission data sets for the year 2000 deployed in UM-UKCA against key observational constraints. We explore the impact of the treatment of model boundary conditions for methane and show that, depending on other factors, such as CO emissions, satisfactory agreement may be obtained with either of the CH4 emission data sets, highlighting the difficulty in unambiguous choice of model emissions in a coupled chemistry model with strong feedbacks. The feedbacks in the CH4-CO-OH system, and their uncertainties, play a critical role in the projection of possible futures. In a future driven by large increases in greenhouse gas forcing, increases in tropospheric temperature drive, an increase in water vapor, and, hence, [OH]. In the absence of methane emission changes this leads to a significant decrease in methane compared to the year 2000. However, adding a projected increase in methane emissions from the RCP8.5 scenario leads to a large increase in methane abundance. This is modified by changes to CO and NOx emissions. Clearly, future levels of methane are uncertain and depend critically on climate change and on the future emission pathways of methane and ozone precursors. We highlight that further work is needed to understand the coupled CH4-CO-OH system in order to understand better future methane evolution. © 2020. The Authors.
英文关键词	emissions; feedbacks; methane; modeling; RCP8.5
语种	英语
scopus关键词	Atmospheric chemistry; Climate change; Digital storage; Greenhouse gases; Methane; Atmospheric methanes; Chemistry-climate models; Climate response; Coupled chemistry; Greenhouse-gas forcing; Methane emissions; Ozone precursors; Tropospheric temperature; Climate models; atmospheric chemistry; atmospheric forcing; boundary condition; carbon monoxide; climate change; future prospect; greenhouse gas; methane; ozone
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156621
作者单位	Chemistry Department, Cambridge University, Cambridge, United Kingdom; National Centre for Atmospheric Science, Cambridge University, Cambridge, United Kingdom
推荐引用方式 GB/T 7714	Heimann I.,Griffiths P.T.,Warwick N.J.,et al. Methane Emissions in a Chemistry-Climate Model: Feedbacks and Climate Response[J],2020,12(10).
APA	Heimann I.,Griffiths P.T.,Warwick N.J.,Abraham N.L.,Archibald A.T.,&Pyle J.A..(2020).Methane Emissions in a Chemistry-Climate Model: Feedbacks and Climate Response.Journal of Advances in Modeling Earth Systems,12(10).
MLA	Heimann I.,et al."Methane Emissions in a Chemistry-Climate Model: Feedbacks and Climate Response".Journal of Advances in Modeling Earth Systems 12.10(2020).