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| Titel |
Data-based estimates of the ocean carbon sink variability – results of the Surface Ocean pCO2 Mapping intercomparison (SOCOM) |
| VerfasserIn |
Christian Rödenbeck, Dorothée Bakker, Nicolas Gruber, Yosuke Iida, Andy Jacobson, Steve Jones, Peter Landschützer, Nicolas Metzl, Shin-ichiro Nakaoka, Are Olsen, Geun-Ha Park, Philippe Peylin, Keith Rodgers, Tristan Sasse, Ute Schuster, James Shutler, Vinu Valsala, Rik Wanninkhof, Jiye Zeng |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250131347
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| Publikation (Nr.) |
 EGU/EGU2016-11746.pdf |
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| Zusammenfassung |
| \newcommand{\COtwo}{{CO$_2$}}
\newcommand{\pCOtwo}{\ensuremath{p}\COtwo}
\newcommand{\UPgCyr}{\unit{PgC\,yr\ensuremath{^{-1}}}}
\newcommand{\IAVampl}{$0.31$\,\UPgCyr}
\newcommand{\AnalysisPeriod}{1992--2009}
Using measurements of the surface-ocean \COtwo\ partial pressure (\pCOtwo)
from the SOCAT and LDEO data bases
and 14 different \pCOtwo\ mapping methods
recently collated by the Surface Ocean \pCOtwo\ Mapping intercomparison
(SOCOM) initiative,
variations in regional and global sea--air \COtwo\ fluxes are
investigated.
Though the available mapping methods use widely different approaches,
we find relatively consistent estimates of regional \pCOtwo\ 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 \pCOtwo\ data or
indirectly from driver data via regression.
From a weighted ensemble average, we find an IAV amplitude of the
global sea--air \COtwo\ flux
of \IAVampl\ (standard deviation over \AnalysisPeriod),
which is larger than simulated by biogeochemical process models.
On a decadal perspective,
the global ocean \COtwo\ uptake is estimated to have gradually increased
since about 2000,
with little decadal change prior to that.
The weighted mean net global ocean \COtwo\ sink estimated by the SOCOM
ensemble is $-1.75\,$\UPgCyr (\AnalysisPeriod),
consistent within uncertainties with estimates from ocean-interior
carbon data or atmospheric oxygen trends.
Using data-based sea--air \COtwo\ fluxes in atmospheric \COtwo\ inversions
also helps to better constrain land--atmosphere \COtwo\ fluxes. |
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