Please use this identifier to cite or link to this item:
Title: An intercomparison of inverse models for estimating sources and sinks of CO2 using GOSAT measurements
Authors: Houweling, S.
Baker, D.
Basu, S.
Boesch, Hartmut
Butz, A.
Chevallier, F.
Deng, F.
Dlugokencky, E. J.
Feng, L.
Ganshin, A.
Hasekamp, O.
Jones, D.
Maksyutov, S.
Marshall, J.
Oda, T.
O'Dell, C. W.
Oshchepkov, S.
Palmer, P. I.
Peylin, P
Poussi, Z.
Reum, F.
Takagi, H.
Yoshida, Y.
Zhuravlev, R.
First Published: 19-May-2015
Publisher: American Geophysical Union (AGU)
Citation: Journal Of Geophysical Research-atmospheres, 2015, 120 (10), pp. 5253-5266 (14)
Abstract: This study presents the outcome of an inverse modeling intercomparison experiment on the use of total column CO2 retrievals from Greenhouse Gas Observing Satellite (GOSAT) for quantifying global sources and sinks of CO2. Eight research groups submitted inverse modeling results for the first year of GOSAT measurements. Inversions were carried out using only GOSAT data, a combination of GOSAT and surface measurements, and using only surface measurements. As expected, the most robust flux estimates are obtained at large scales (e.g., within 20% of the annual flux at the global scale), and they quickly diverge toward the scale of the subcontinental TRANSCOM regions and beyond (to >100% of the annual flux). We focus our analysis on a shift in the CO2 uptake over land from the Tropics toward the Northern Hemisphere Extra tropics of ∼1 PgC/yr when GOSAT data are used in the inversions. This shift is largely driven by TRANSCOM regions Europe and Northern Africa, showing, respectively, an increased uptake and release of 0.7 and 0.9 PgC/yr. Inversions using GOSAT data show a reduced gradient between midlatitudes of the Northern Hemisphere and the Tropics, consistent with the latitudinal shift in carbon uptake. However, the reduced gradients degrade the agreement with background aircraft and surface measurements. To narrow the range of inversion-derived flux, estimates will require further efforts to understand the differences not only between the retrieval schemes but also between inverse models, as their contributions to the overall uncertainty are estimated to be of similar magnitude.
DOI Link: 10.1002/2014JD022962
ISSN: 2169-897X
eISSN: 2169-8996
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2015. American Geophysical Union. All Rights Reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

Files in This Item:
File Description SizeFormat 
jgrd52158.pdfPublished (publisher PDF)1.38 MBAdobe PDFView/Open

Items in LRA are protected by copyright, with all rights reserved, unless otherwise indicated.