Global ocean carbon uptake

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Author(s) Wanninkhof, R., Park, G.-H., Takahashi, T., Sweeney, C., Feely, R., Nojiri, Y., Gruber, N., Doney, S. C., McKinley, G. A., Lenton, A., Le Quéré, C., Heinze, C., Schwinger, J., Graven, H., Khatiwala, S.
Publication Type Journal Items, Publication Status: Published
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Title Global ocean carbon uptake
Subtitle Magnitude, variability and trends
Author(s) Wanninkhof, R.
Park, G.-H.
Takahashi, T.
Sweeney, C.
Feely, R.
Nojiri, Y.
Gruber, N.
Doney, S. C.
McKinley, G. A.
Lenton, A.
Le Quéré, C.
Heinze, C.
Schwinger, J.
Graven, H.
Khatiwala, S.
Journal or Series Title Biogeosciences discussions
Volume Number 9
Issue Number 8
Start Page 10961
End Page 11012
ISSN 1810-6277
Publisher Katlenburg-Lindau
Publication Place European Geosciences Union
Publication Date 2012-08
Abstract Estimates of the anthropogenic global-integrated sea-air carbon dioxide (CO2) flux from 1990 to 2009, based on different models and measurements, range from –1.4 to –2.6 Pg C yr–1. The median values of anthropogenic CO2 for each method show better agreement and are: −1.9 for Pg C yr−1 for numerical ocean general circulation hind cast models (OGCMs) with parameterized biogeochemistry; –2.1 Pg C yr–1 for atmospheric inverse models; –1.9 Pg C yr–1 for global atmospheric constraints based on O2 / N2 ratios for 1990–2000; and –2.4 Pg C yr–1 for oceanic inverse models. An updated estimate of this anthropogenic CO2 flux based on a climatology of sea-air partial pressure of CO2 differences (ΔpCO2) (Takahashi et al., 2009) and a bulk formulation of gas transfer with wind speed for year 2000 is –2.0 Pg C yr–1. Using this ΔpCO2 climatology and empirical relationships of pCO2 with sea-surface temperature (SST) anomalies (Park et al., 2010a), the interannual variability of the contemporary CO2 flux is estimated to be 0.20 Pg C yr–1 (1σ) from 1990 through 2009. This is similar to the variability estimated by the OGCMs of 0.16 Pg C yr–1 but smaller than the interannual variability from atmospheric inverse estimates of 0.40 Pg C yr–1. The variability is largely driven by large-scale climate re-organizations. The decadal trends for different methods range from –0.13 (Pg C yr–1) decade–1 to –0.50 (Pg C yr−1) decade−1. The OGCMs and the data based sea-air CO2 flux estimates show smaller uptakes and appreciably smaller decadal trends than estimates based on changes in carbon inventory suggesting that methods capable of resolving shorter timescales are showing a slowing of the rate of ocean CO2 uptake. It is not clear if this large difference in trend is a methodological issue or a real natural feedback.
DOI 10.5194/bgd-9-10961-2012
Additional Notes Received 30 June 2012, Accepted 3 July 2012, Published 15 August 2012
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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Source Database ID FORM-1359382570
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@article{Wnnnkhf2012,
  author = "Wanninkhof, R. and Park, G.-H. and Takahashi, T. and Sweeney, C. and Feely, R. and Nojiri, Y. and Gruber, N. and Doney, S. C. and McKinley, G. A. and Lenton, A. and Le Qu{\'{e}}r{\'{e}}, C. and Heinze, C. and Schwinger, J. and Graven, H. and Khatiwala, S.",
  title = "{G}lobal ocean carbon uptake: {M}agnitude, variability and trends",
  journal = "Biogeosciences discussions",
  year = 2012,
  volume = "9",
  number = "8",
  pages = "10961--11012",
  month = aug,
}


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