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Influence of reduced carbon emissions and oxidation on the distribution of atmospheric CO_2: Implications for inversion analyses

Suntharalingam, Parvadha and Randerson, James T. and Krakauer, Nir and Logan, Jennifer A. and Jacob, Daniel J. (2005) Influence of reduced carbon emissions and oxidation on the distribution of atmospheric CO_2: Implications for inversion analyses. Global Biogeochemical Cycles, 19 (4). Art. No. GB4003. ISSN 0886-6236. https://resolver.caltech.edu/CaltechAUTHORS:20181128-140625713

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Abstract

Recent inverse analyses constraining carbon fluxes using atmospheric CO_2 observations have assumed that the CO_2 source from atmospheric oxidation of reduced carbon is released at the surface rather than distributed globally in the atmosphere. This produces a bias in the estimates of surface fluxes. We used a three‐dimensional (3D) atmospheric chemistry model (GEOS‐CHEM) to evaluate the magnitude of this effect on modeled concentrations and flux estimates. We find that resolving the 3D structure of the atmospheric CO_2 source, as opposed to emitting this reduced carbon as CO_2 at the surface, yields a decrease in the modeled annual mean interhemispheric gradient (N‐S) of 0.21 ppm. Larger adjustments (up to −0.6 ppm) are apparent on a regional basis in and downwind of regions of high reduced carbon emissions. We used TransCom3 annual mean simulations from three transport models to evaluate the implications for inversion estimates. The main impacts are systematic decreases in estimates of northern continental land uptake (i.e., by 0.22 to 0.26 Pg C yr^(−1)), and reductions in tropical land carbon efflux with smaller changes over oceans and in the Southern Hemisphere. These adjustments represent a systematic bias in flux estimates, accounting for changes of 9 to 27% in the estimated northern land CO_2 sink for the three models evaluated here. Our results highlight the need for a realistic description of reduced carbon emission and oxidation processes in deriving inversion estimates of CO_2 surface fluxes.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2005gb002466DOIArticle
ORCID:
AuthorORCID
Randerson, James T.0000-0001-6559-7387
Jacob, Daniel J.0000-0002-6373-3100
Alternate Title:Influence of reduced carbon emissions and oxidation on the distribution of atmospheric CO2: Implications for inversion analyses
Additional Information:© 2005 by the American Geophysical Union. Received 24 January 2005; revised 27 May 2005; accepted 15 July 2005; published 11 October 2005. This work was supported by the NOAA OGP Global Carbon Cycle Program. The GEOS‐CHEM model is managed at Harvard University with support from the NASA Atmospheric Chemistry Modeling and Analysis Program. N. Y. K. was supported by a graduate fellowship from the Betty and Gordon Moore Foundation. J. T. R. gratefully acknowledges support from NASA (NNG04GK49G) and NOAA (NA03OAR4310059). We thank Arlene Fiore and Bryan Duncan for helpful discussions.
Funders:
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
NASANNG04GK49G
National Oceanic and Atmospheric Administration (NOAA)NA03OAR4310059
Subject Keywords:atmospheric CO_2; inverse analyses; reduced carbon oxidation
Issue or Number:4
Record Number:CaltechAUTHORS:20181128-140625713
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20181128-140625713
Official Citation:Suntharalingam, P., J. T. Randerson, N. Krakauer, J. A. Logan, and D. J. Jacob (2005), Influence of reduced carbon emissions and oxidation on the distribution of atmospheric CO2: Implications for inversion analyses, Global Biogeochem. Cycles, 19, GB4003, doi: 10.1029/2005GB002466.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91310
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:28 Nov 2018 23:28
Last Modified:09 Mar 2020 13:18

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