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| Titel |
Changes in column inventories of carbon and oxygen in the Atlantic Ocean |
| VerfasserIn |
T. Tanhua, R. F. Keeling |
| 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 ; 9, no. 11 ; Nr. 9, no. 11 (2012-11-26), S.4819-4833 |
| Datensatznummer |
250007414
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| Publikation (Nr.) |
 copernicus.org/bg-9-4819-2012.pdf |
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| Zusammenfassung |
| Increasing concentrations of dissolved inorganic carbon (DIC) in the
interior ocean are expected as a direct consequence of increasing
concentrations of CO2 in the atmosphere. This extra DIC is often
referred to as anthropogenic carbon (Cant), and its inventory, or
increase rate, in the interior ocean has previously been estimated by a
multitude of observational approaches. Each of these methods is associated
with hard to test assumptions since Cant cannot be directly observed.
Results from a simpler concept with fewer assumptions applied to the
Atlantic Ocean are reported on here using two large data collections of
carbon relevant bottle data. The change in column inventory on decadal time
scales, i.e. the storage rate, of DIC, respiration compensated DIC and
oxygen is calculated for the Atlantic Ocean. We report storage rates and the
confidence intervals of the mean trend at the 95% level (CI), reflecting
the mean trend but not considering potential biasing effects of the spatial
and temporal sampling. For the whole Atlantic Ocean the mean trends for DIC
and oxygen are non-zero at the 95% confidence level: DIC: 0.86 (CI: 0.72–1.00)
and oxygen: −0.24 (CI: −0.41–(−0.07)) mol m−2 yr−1. For
oxygen, the whole Atlantic trend is dominated by the subpolar North
Atlantic, whereas for other regions the O2 trends are not significant. The
storage rates are similar to changes found by other studies, although with
large uncertainty. For the subpolar North Atlantic the storage rates show
significant temporal and regional variation of all variables. This seems to
be due to variations in the prevalence of subsurface water masses with
different DIC and oxygen concentrations leading to sometimes different signs
of storage rates for DIC compared to published Cant estimates. This
study suggest that accurate assessment of the uptake of CO2 by the
oceans will require accounting not only for processes that influence
Cant but also additional processes that modify CO2 storage. |
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