气候变化领域集成服务门户(CCPortal): Spatial heterogeneity in CO2, CH4, and energy fluxes: insights from airborne eddy covariance measurements over the Mid-Atlantic region

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DOI	10.1088/1748-9326/ab7391
	Spatial heterogeneity in CO2, CH4, and energy fluxes: insights from airborne eddy covariance measurements over the Mid-Atlantic region
	Hannun R.A.; Wolfe G.M.; Kawa S.R.; Hanisco T.F.; Newman P.A.; Alfieri J.G.; Barrick J.; Clark K.L.; Digangi J.P.; Diskin G.S.; King J.; Kustas W.P.; Mitra B.; Noormets A.; Nowak J.B.; Thornhill K.L.; Vargas R.
发表日期	2020
ISSN	17489318
卷号	15 期号:3
英文摘要	The exchange of carbon between the Earth's atmosphere and biosphere influences the atmospheric abundances of carbon dioxide (CO2) and methane (CH4). Airborne eddy covariance (EC) can quantify surface-atmosphere exchange from landscape-to-regional scales, offering a unique perspective on carbon cycle dynamics. We use extensive airborne measurements to quantify fluxes of sensible heat, latent heat, CO2, and CH4 across multiple ecosystems in the Mid-Atlantic region during September 2016 and May 2017. In conjunction with footprint analysis and land cover information, we use the airborne dataset to explore the effects of landscape heterogeneity on measured fluxes. Our results demonstrate large variability in CO2 uptake over mixed agricultural and forested sites, with fluxes ranging from -3.4 0.7 to -11.5 1.6 μmol m-2 s-1 for croplands and -9.1 1.5 to -22.7 3.2 μmol m-2 s-1 for forests. We also report substantial CH4 emissions of 32.3 17.0 to 76.1 29.4 nmol m-2 s-1 from a brackish herbaceous wetland and 58.4 12.0 to 181.2 36.8 nmol m-2 s-1 from a freshwater forested wetland. Comparison of ecosystem-specific aircraft observations with measurements from EC flux towers along the flight path demonstrate that towers capture ∼30%-75% of the regional variability in ecosystem fluxes. Diel patterns measured at the tower sites suggest that peak, midday flux measurements from aircraft accurately predict net daily CO2 exchange. We discuss next steps in applying airborne observations to evaluate bottom-up flux models and improve understanding of the biophysical processes that drive carbon exchange from landscape-to-regional scales. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	airborne eddy covariance; biosphere-atmosphere exchange; CO2 and CH4; fluxes
语种	英语
scopus关键词	Agricultural robots; Air traffic control; Aircraft; Biospherics; Earth atmosphere; Ecosystems; Fluxes; Forestry; Wetlands; Aircraft observations; Atmospheric abundance; CO2 and CH4; Eddy covariance; Eddy covariance measurements; Land cover informations; Landscape heterogeneities; Spatial heterogeneity; Carbon dioxide; agricultural land; airborne sensing; atmosphere-biosphere interaction; carbon cycle; carbon dioxide; carbon footprint; covariance analysis; gas exchange; herb; heterogeneity; land cover; latent heat flux; methane; sensible heat flux; spatial analysis; Atlantic Ocean
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/154146
作者单位	Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, MD, United States; USDA Agricultural Research Service, Hydrology and Remote Sensing Laboratory, Beltsville, MD, United States; NASA Langley Research Center, Hampton, VA, United States; USDA Forest Service, Northern Research Station, Silas Little Experimental Forest, New Lisbon, NJ, United States; Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC, United States; Department of Ecosystem Science and Management, Texas AandM University, College Station, TX, United States; Department of Plant and Soil Sciences, University of Delaware, Newark, DE, United States
推荐引用方式 GB/T 7714	Hannun R.A.,Wolfe G.M.,Kawa S.R.,et al. Spatial heterogeneity in CO2, CH4, and energy fluxes: insights from airborne eddy covariance measurements over the Mid-Atlantic region[J],2020,15(3).
APA	Hannun R.A..,Wolfe G.M..,Kawa S.R..,Hanisco T.F..,Newman P.A..,...&Vargas R..(2020).Spatial heterogeneity in CO2, CH4, and energy fluxes: insights from airborne eddy covariance measurements over the Mid-Atlantic region.Environmental Research Letters,15(3).
MLA	Hannun R.A.,et al."Spatial heterogeneity in CO2, CH4, and energy fluxes: insights from airborne eddy covariance measurements over the Mid-Atlantic region".Environmental Research Letters 15.3(2020).