气候变化领域集成服务门户(CCPortal): Stable climate metrics for emissions of short and long-lived species-combining steps and pulses

CCPortal

DOI	10.1088/1748-9326/ab6039
	Stable climate metrics for emissions of short and long-lived species-combining steps and pulses
	Collins W.J.; Frame D.J.; Fuglestvedt J.S.; Shine K.P.
发表日期	2020
ISSN	17489318
卷号	15 期号:2
英文摘要	Multi-gas climate agreements rely on a methodology (widely referred to as 'metrics') to place emissions of different gases on a CO2-equivalent scale. There has been an ongoing debate on the extent to which existing metrics serve current climate policy. Endpoint metrics (such as global temperature change potential GTP) are the most closely related to policy goals based on temperature limits (such as Article 2 of the Paris Agreement). However, for short-lived climate forcers (SLCFs), endpoint metrics vary strongly with time horizon making them difficult to apply in practical situations. We show how combining endpoint metrics for a step change in SLCF emissions with a pulse emission of CO2 leads to an endpoint metric that only varies slowly over time horizons of interest. We therefore suggest that these combined step-pulse metrics (denoted combined global warming potential CGWP and combined global temperature change potential CGTP) can be a useful way to include short and long-lived species in the same basket in policy applications-this assumes a single basket approach is preferred by policy makers. The advantage of a combined step-pulse metric for SLCFs is that for species with a lifetime less than 20 years a single time horizon of around 75 years can cover the range of timescales appropriate to the Paris Agreement. These metrics build on recent work using the traditional global warming potential (GWP) metric in a new way, called GWP*. We show how the GWP∗ relates to CGWP and CGTP and that it systematically underestimates the temperature effects of SLCFs by up to 20%. These step-pulse metrics are all more appropriate than the conventional GWP for comparing the relative contributions of different species to future temperature targets and for SLCFs they are much less dependent on time horizon than GTP. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	carbon budgets; climate metrics; climate targets; non-CO2 greenhouse gases; short-lived climate forcers
语种	英语
scopus关键词	Atmospheric temperature; Budget control; Carbon dioxide; Global warming; Greenhouse gases; Carbon budgets; climate metrics; Climate targets; Global temperature change; Global warming potential; Relative contribution; short-lived climate forcers; Temperature limits; Gas emissions; carbon budget; carbon emission; climate change; emission; environmental policy; global warming; greenhouse gas; international agreement; policy making
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154097
作者单位	Department of Meteorology, University of Reading, Reading, United Kingdom; New Zealand Climate Change Research Institute, Victoria University of Wellington, Wellington, New Zealand; Center for International Climate and Environmental Research (CICERO), Oslo, Norway
推荐引用方式 GB/T 7714	Collins W.J.,Frame D.J.,Fuglestvedt J.S.,et al. Stable climate metrics for emissions of short and long-lived species-combining steps and pulses[J],2020,15(2).
APA	Collins W.J.,Frame D.J.,Fuglestvedt J.S.,&Shine K.P..(2020).Stable climate metrics for emissions of short and long-lived species-combining steps and pulses.Environmental Research Letters,15(2).
MLA	Collins W.J.,et al."Stable climate metrics for emissions of short and long-lived species-combining steps and pulses".Environmental Research Letters 15.2(2020).