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Improved Constraints on Northern Extratropical CO2 Fluxes Obtained by Combining Surface-Based and Space-Based Atmospheric CO2 Measurements

Byrne, B. and Liu, J. and Lee, M. and Baker, I. and Bowman, K. W. and Deutscher, N. M. and Feist, Dietrich G. and Griffith, D. W. T. and Iraci, Laura T. and Kiel, Matthäus and Kimball, J. S. and Miller, C. E. and Morino, Isamu and Parazoo, N. C. and Petri, Christof and Roehl, Coleen M. and Sha, Mahesh K. and Strong, Kimberly and Velazco, Voltaire A. and Wennberg, Paul O. and Wunch, Debra (2020) Improved Constraints on Northern Extratropical CO2 Fluxes Obtained by Combining Surface-Based and Space-Based Atmospheric CO2 Measurements. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 125 (15), e2019JD032029. Wiley. DOI: 10.1029/2019JD032029 ISSN 2169-897X

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019JD032029

Abstract

Abstract Top-down estimates of CO2 fluxes are typically constrained by either surface-based or space-based CO2 observations. Both of these measurement types have spatial and temporal gaps in observational coverage that can lead to differences in inferred fluxes. Assimilating both surface-based and space-based measurements concurrently in a flux inversion framework improves observational coverage and reduces sampling related artifacts. This study examines the consistency of flux constraints provided by these different observations and the potential to combine them by performing a series of 6-year (2010?2015) CO2 flux inversions. Flux inversions are performed assimilating surface-based measurements from the in situ and flask network, measurements from the Total Carbon Column Observing Network (TCCON), and space-based measurements from the Greenhouse Gases Observing Satellite (GOSAT), or all three data sets combined. Combining the data sets results in more precise flux estimates for subcontinental regions relative to any of the data sets alone. Combining the data sets also improves the accuracy of the posterior fluxes, based on reduced root-mean-square differences between posterior flux-simulated CO2 and aircraft-based CO2 over midlatitude regions (0.33?0.56?ppm) in comparison to GOSAT (0.37?0.61?ppm), TCCON (0.50?0.68?ppm), or in situ and flask measurements (0.46?0.56?ppm) alone. These results suggest that surface-based and GOSAT measurements give complementary constraints on CO2 fluxes in the northern extratropics and can be combined in flux inversions to improve constraints on regional fluxes. This stands in contrast with many earlier attempts to combine these data sets and suggests that improvements in the NASA Atmospheric CO2 Observations from Space (ACOS) retrieval algorithm have significantly improved the consistency of space-based and surface-based flux constraints.

Item URL in elib:https://elib.dlr.de/135690/
Document Type:Article
Title:Improved Constraints on Northern Extratropical CO2 Fluxes Obtained by Combining Surface-Based and Space-Based Atmospheric CO2 Measurements
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Byrne, B.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USAhttps://orcid.org/0000-0003-0619-3045
Liu, J.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USAhttps://orcid.org/0000-0002-7184-6594
Lee, M.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USAhttps://orcid.org/0000-0002-8797-8209
Baker, I.Atmospheric Science Department, Colorado State University, Fort Collins, CO, USAhttps://orcid.org/0000-0001-5162-1956
Bowman, K. W.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USAhttps://orcid.org/0000-0002-8659-1117
Deutscher, N. M.Centre for Atmospheric Chemistry, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, New South Wales, Australiahttps://orcid.org/0000-0002-2906-2577
Feist, Dietrich G.DLR, IPA und Univ. Münchenhttps://orcid.org/0000-0002-5890-6687
Griffith, D. W. T.University of Wollongong, Wollongong, Australiahttps://orcid.org/0000-0002-7986-1924
Iraci, Laura T.NASA Ames Research Center, Mountain View, California, USAhttps://orcid.org/0000-0002-2859-5259
Kiel, MatthäusDivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USAhttps://orcid.org/0000-0002-9784-962X
Kimball, J. S.Numerical Terradynamic Simulation Group, W.A. Franke College of Forestry & Conservation, The University of Montana, Missoula, MT, USAhttps://orcid.org/0000-0002-5493-5878
Miller, C. E.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USAhttps://orcid.org/0000-0002-9380-4838
Morino, IsamuNational Institute for Environmental Studies (NIES), Tsukuba, Japanhttps://orcid.org/0000-0003-2720-1569
Parazoo, N. C.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USAhttps://orcid.org/0000-0002-4424-7780
Petri, ChristofInstitute of Environmental Physics, University of Bremen, Bremen, Germanyhttps://orcid.org/0000-0002-7010-5532
Roehl, Coleen M.Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USAhttps://orcid.org/0000-0001-5383-8462
Sha, Mahesh K.Royal Belgian Institute for Space Aeronomy (BIRA-IASB), 1180 Brussels, Belgiumhttps://orcid.org/0000-0003-1440-1529
Strong, KimberlyDepartment of Physics, University of Toronto, Toronto, Canadahttps://orcid.org/0000-0001-9947-1053
Velazco, Voltaire A.Centre for Atmospheric Chemistry, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Northfields Ave., Wollongong, NSW 2522, Australiahttps://orcid.org/0000-0002-1376-438X
Wennberg, Paul O.Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USAhttps://orcid.org/0000-0002-6126-3854
Wunch, DebraDepartment of Physics, University of Toronto, Toronto, Canadahttps://orcid.org/0000-0002-4924-0377
Date:26 July 2020
Journal or Publication Title:JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:125
DOI :10.1029/2019JD032029
Page Range:e2019JD032029
Publisher:Wiley
ISSN:2169-897X
Status:Published
Keywords:Carbon cycle, CO2 flux, data assimilation, GOSAT, TCCON, OCO-2
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben LIDAR-Forschung und -Entwicklung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Institute of Atmospheric Physics > Lidar
Deposited By: Feist, Dr. Dietrich
Deposited On:03 Aug 2020 11:30
Last Modified:03 Aug 2020 12:34

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