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Titel |
Data-based estimates of the ocean carbon sink variability – first results of the Surface Ocean pCO2 Mapping intercomparison (SOCOM) |
VerfasserIn |
C. Rödenbeck, D. C. E. Bakker, N. Gruber, Y. Iida, A. R. Jacobson, S. Jones, P. Landschützer, N. Metzl, S. Nakaoka, A. Olsen, G.-H. Park, P. Peylin, K. B. Rodgers, T. P. Sasse, U. Schuster, J. D. Shutler, V. Valsala, R. Wanninkhof, J. Zeng |
Medientyp |
Artikel
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Sprache |
Englisch
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ISSN |
1726-4170
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Digitales Dokument |
URL |
Erschienen |
In: Biogeosciences ; 12, no. 23 ; Nr. 12, no. 23 (2015-12-11), S.7251-7278 |
Datensatznummer |
250118210
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Publikation (Nr.) |
copernicus.org/bg-12-7251-2015.pdf |
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Zusammenfassung |
Using measurements of the surface-ocean CO2 partial pressure
(pCO2) and 14 different pCO2 mapping methods recently collated by
the Surface Ocean pCO2 Mapping intercomparison (SOCOM) initiative,
variations in regional and global sea–air CO2 fluxes are investigated.
Though the available mapping methods use widely different approaches, we find
relatively consistent estimates of regional pCO2 seasonality, in line
with previous estimates. In terms of interannual variability (IAV), all
mapping methods estimate the largest variations to occur in the eastern
equatorial Pacific. Despite considerable spread in the detailed variations,
mapping methods that fit the data more closely also tend to agree more
closely with each other in regional averages. Encouragingly, this includes
mapping methods belonging to complementary types – taking variability either
directly from the pCO2 data or indirectly from driver data via
regression. From a weighted ensemble average, we find an IAV amplitude of the
global sea–air CO2 flux of 0.31 PgC yr−1 (standard deviation
over 1992–2009), which is larger than simulated by biogeochemical process
models. From a decadal perspective, the global ocean CO2 uptake is
estimated to have gradually increased since about 2000, with little decadal
change prior to that. The weighted mean net global ocean CO2 sink
estimated by the SOCOM ensemble is −1.75 PgC yr−1 (1992–2009),
consistent within uncertainties with estimates from ocean-interior carbon
data or atmospheric oxygen trends. |
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