A joint atmosphere-ocean inversion for surface fluxes of carbon dioxide

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Author(s) Jacobson, Andrew R., Mikaloff Fletcher, Sara E., Gruber, Nicolas, Sarmiento, Jorge L., Gloor, Manuel
Publication Type Journal Items, Publication Status: Published
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Title A joint atmosphere-ocean inversion for surface fluxes of carbon dioxide
Subtitle 2. regional results
Author(s) Jacobson, Andrew R.
Mikaloff Fletcher, Sara E.
Gruber, Nicolas
Sarmiento, Jorge L.
Gloor, Manuel
Description 15 p.
Journal or Series Title Global biogeochemical cycles : an international journal of global change
Volume Number 21
Issue Number 1
Start Page GB1020
ISSN 0886-6236
Publisher American Geophysical Union
Publication Place Washington, DC
Publication Date 2007
Keyword(s) Carbon
Abstract We report here the results from a coupled ocean-atmosphere inversion, in which atmospheric CO2 gradients and transport simulations are combined with observations of ocean interior carbon concentrations and ocean transport simulations to provide a jointly constrained estimate of air-sea and air-land carbon fluxes. While atmospheric data have little impact on regional air-sea flux estimates, the inclusion of ocean data drives a substantial change in terrestrial flux estimates. Our results indicate that the tropical and southern land regions together are a large source of carbon, with a 77% probability that their aggregate source size exceeds 1 PgC yr(-1). This value is of similar magnitude to estimates of fluxes in the tropics due to land-use change alone, making the existence of a large tropical CO2 fertilization sink unlikely. This terrestrial result is strongly driven by oceanic inversion results that differ from flux estimates based on Delta pCO(2) climatologies, including a relatively small Southern Ocean sink (south of 44 degrees S) and a relatively large sink in the southern temperate latitudes (44 degrees S-18 degrees S). These conclusions are based on a formal error analysis of the results, which includes uncertainties due to observational error transport and other modeling errors, and biogeochemical assumptions. A suite of sensitivity tests shows that these results are generally robust, but they remain subject to potential sources of unquantified error stemming from the use of large inversion regions and transport biases common to the suite of available transport models.
DOI 10.1029/2006GB002703
Additional Notes Received 31 January 2006, Revised 4 November 2006, Accepted 27 November 2006
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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NEBIS System Number 000041178
Source Database ID PP-38836
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  author = "Jacobson, Andrew R. and Mikaloff Fletcher, Sara E. and Gruber, Nicolas and Sarmiento, Jorge L. and Gloor, Manuel",
  title = "{A} joint atmosphere-ocean inversion for surface fluxes of carbon dioxide: 2. regional results",
  journal = "Global biogeochemical cycles : an international journal of global change",
  year = 2007,
  volume = "21",
  number = "1",
  pages = "GB1020--",

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