气候变化领域集成服务门户(CCPortal): Multispecies Assessment of Factors Influencing Regional CO2 and CH4 Enhancements During the Winter 2017 ACT-America Campaign

CCPortal

DOI	10.1029/2019JD031339
	Multispecies Assessment of Factors Influencing Regional CO2 and CH4 Enhancements During the Winter 2017 ACT-America Campaign
	Baier B.C.; Sweeney C.; Choi Y.; Davis K.J.; DiGangi J.P.; Feng S.; Fried A.; Halliday H.; Higgs J.; Lauvaux T.; Miller B.R.; Montzka S.A.; Newberger T.; Nowak J.B.; Patra P.; Richter D.; Walega J.; Weibring P.
发表日期	2020
ISSN	2169897X
卷号	125 期号:2
英文摘要	Diagnosing carbon dioxide (CO2) and methane (CH4) fluxes at subcontinental scales is complicated by sparse observations, limited knowledge of prior fluxes and their uncertainties, and background and transport errors. Multispecies measurements in flasks sampled during the wintertime ACT-America campaign were used for background characterization and source apportionment of regional anthropogenic CO2 and CH4 fluxes when ecosystem CO2 exchange is likely to be least active. Continental background trace gas mole fractions for regional enhancements are defined using samples from the upper troposphere and assessed using model products. Trace gas enhancements taken from flask samples in the lower troposphere with background levels subtracted out are then interpreted to inform CO2 and CH4 enhancement variability in the eastern United States. Strong correlations between CO2 and CH4 enhancements in the Midwestern and Mid-Atlantic United States indicated colocated anthropogenic sources. Oil and natural gas influence was also broadly observed throughout the entire observational domain. In the Midwestern United States, agricultural influence on CO2 and CH4 enhancement variability was evident during above-average wintertime temperatures. Weaker correlations between CO2 and anthropogenic tracer enhancements in the Southeastern United States indicated potentially nonnegligible wintertime ecosystem CO2 exchange, with biogenic tracers indicating more active surface processing than other regions. These whole-air flask samples illuminated significant regional CO2 and CH4 sources or sinks during Atmospheric Carbon and Transport-America (ACT-America) and can provide additional information for informing regional inverse modeling efforts. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	ACT-America; carbon cycle; carbon dioxide; flask sampling; methane; source attribution
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186230
作者单位	Cooperative Institute for Research in Environmental Sciences, University of Colorado-Boulder, Boulder, CO, United States; NOAA Earth System Research Laboratory Global Monitoring Division, Boulder, CO, United States; NASA Langley Research Center, Hampton, VA, United States; Department of Meteorology and Atmospheric Science, Pennsylvania State University, University Park, PA, United States; Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA, United States; Institute for Alpine and Arctic Research, University of Colorado-Boulder, Boulder, CO, United States; Japan Agency for Marine-Earth Science and Technology, Kaganawa, Japan
推荐引用方式 GB/T 7714	Baier B.C.,Sweeney C.,Choi Y.,et al. Multispecies Assessment of Factors Influencing Regional CO2 and CH4 Enhancements During the Winter 2017 ACT-America Campaign[J],2020,125(2).
APA	Baier B.C..,Sweeney C..,Choi Y..,Davis K.J..,DiGangi J.P..,...&Weibring P..(2020).Multispecies Assessment of Factors Influencing Regional CO2 and CH4 Enhancements During the Winter 2017 ACT-America Campaign.Journal of Geophysical Research: Atmospheres,125(2).
MLA	Baier B.C.,et al."Multispecies Assessment of Factors Influencing Regional CO2 and CH4 Enhancements During the Winter 2017 ACT-America Campaign".Journal of Geophysical Research: Atmospheres 125.2(2020).