Multispecies Assessment of Factors Influencing Regional CO2 and CH4 Enhancements During the Winter 2017 ACT-America Campaign

Baier, Bianca C.; Sweeney, Colm; Choi, Yonghoon; Davis, Kenneth J.; DiGangi, Joshua P.; Feng, Sha; Fried, Alan; Halliday, Hannah; Higgs, Jack; Lauvaux, Thomas; Miller, Benjamin R.; Montzka, Stephen A.; Newberger, Timothy; Nowak, John B.; Patra, Prabir; Richter, Dirk; Walega, James; Weibring, Petter

doi:10.1029/2019JD031339

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Multispecies Assessment of Factors Influencing Regional CO2 and CH4 Enhancements During the Winter 2017 ACT-America Campaign

2020
By Baier, Bianca C. ; Sweeney, Colm ; Choi, Yonghoon ; ...
Source: Journal of Geophysical Research: Atmospheres, 125(2)

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Journal Title:

Journal of Geophysical Research: Atmospheres
Personal Author:

Baier, Bianca C. ; Sweeney, Colm ; Choi, Yonghoon ; Davis, Kenneth J. ; DiGangi, Joshua P. ; ... More +

Baier, Bianca C. ; Sweeney, Colm ; Choi, Yonghoon ; Davis, Kenneth J. ; DiGangi, Joshua P. ; Feng, Sha ; Fried, Alan ; Halliday, Hannah ; Higgs, Jack ; Lauvaux, Thomas ; Miller, Benjamin R. ; Montzka, Stephen A. ; Newberger, Timothy ; Nowak, John B. ; Patra, Prabir ; Richter, Dirk ; Walega, James ; Weibring, Petter Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; GML (Global Monitoring Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences)

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; GML (Global Monitoring Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) Less -
Description:

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.
Keywords:

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Carbon Cycle (Biogeochemistry) Carbon Dioxide Methane
Source:

Journal of Geophysical Research: Atmospheres, 125(2)
DOI:

https://doi.org/10.1029/2019JD031339
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Journal Article
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urn:sha256:5546c9b490ce13dbe259d9c99975c9ad2dd08467b6c2dcf9f94470906a3159df
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Multispecies Assessment of Factors Influencing Regional CO2 and CH4 Enhancements During the Winter 2017 ACT-America Campaign

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