气候变化领域集成服务门户(CCPortal): Airborne Mapping Reveals Emergent Power Law of Arctic Methane Emissions

CCPortal

DOI	10.1029/2019GL085707
	Airborne Mapping Reveals Emergent Power Law of Arctic Methane Emissions
	Elder C.D.; Thompson D.R.; Thorpe A.K.; Hanke P.; Walter Anthony K.M.; Miller C.E.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:3
英文摘要	Methane (CH4) emissions from thawing permafrost amplify a climate warming feedback. However, upscaling of site-level CH4 observations across diverse Arctic landscapes remains highly uncertain, compromising accuracy of current pan-Arctic CH4 budgets and confidence in model forecasts. We report a 30,000-km2 survey at 25-m2 resolution (~1 billion observations) of CH4 hotspot patterns across Alaska and northwestern Canada using airborne imaging spectroscopy. Hotspots covered 0.2% of the surveyed area, concentrated in the wetland-upland ecotone, and followed a two-component power law as a function of distance from standing water. Hotspots decreased sharply over the first 40 m from standing water (y = 0.21×−0.649, R2 = 0.97), mirroring in situ flux observations. Beyond 40 m, CH4 hotspots diminished gradually over hundreds of meters (y = 0.004×−0.164, R2 = 0.99). This emergent property quantifies the distribution of strong methanogenic zones from site to regional scales, vastly improving metrics for scaling ground-based CH4 inventories and validation of land models. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Budget control; Methane; Particulate emissions; Permafrost; Remote sensing; Surveys; ABoVE; Airborne imaging; Airborne mapping; Arctic; Climate warming; Emergent property; Flux observation; Methane emissions; Beryllium compounds; accuracy assessment; airborne sensing; climate feedback; methane; permafrost; power law distribution; spatial resolution; spectroscopy; upscaling; Alaska; Arctic; Canada; United States
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170742
作者单位	Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Water and Environmental Research Center, University of Alaska, Fairbanks, AK, United States
推荐引用方式 GB/T 7714	Elder C.D.,Thompson D.R.,Thorpe A.K.,et al. Airborne Mapping Reveals Emergent Power Law of Arctic Methane Emissions[J],2020,47(3).
APA	Elder C.D.,Thompson D.R.,Thorpe A.K.,Hanke P.,Walter Anthony K.M.,&Miller C.E..(2020).Airborne Mapping Reveals Emergent Power Law of Arctic Methane Emissions.Geophysical Research Letters,47(3).
MLA	Elder C.D.,et al."Airborne Mapping Reveals Emergent Power Law of Arctic Methane Emissions".Geophysical Research Letters 47.3(2020).