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| Titel |
Rapid acidification of mode and intermediate waters in the southwestern Atlantic Ocean |
| VerfasserIn |
L. A. Salt, S. M. A. C. van Heuven, M. E. Claus, E. M. Jones, H. J. W. de Baar |
| 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. 5 ; Nr. 12, no. 5 (2015-03-05), S.1387-1401 |
| Datensatznummer |
250117843
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| Publikation (Nr.) |
 copernicus.org/bg-12-1387-2015.pdf |
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| Zusammenfassung |
| Observations along the southwestern Atlantic WOCE A17 line made during the
Dutch GEOTRACES-NL programme (2010–2011) were compared with historical data from
1994 to quantify the changes in the anthropogenic component of the total
pool of dissolved inorganic carbon (ΔCant). Application of the
extended multi-linear regression (eMLR) method shows that the ΔCant
from 1994 to 2011 has largely remained confined to the upper 1000 dbar.
The greatest changes occur in the upper 200 dbar in the Subantarctic
Zone (SAZ), where a maximum increase of 37 μmol kg−1 is found.
South Atlantic Central Water (SACW) experienced the highest rate of increase
in Cant, at 0.99 ± 0.14 μmol kg−1 yr−1, resulting in
a maximum rate of decrease in pH of 0.0016 yr−1. The highest rates of
acidification relative to ΔCant, however, were found in
Subantarctic Mode Water (SAMW) and Antarctic Intermediate Water (AAIW). The
low buffering capacity of SAMW and AAIW combined with their relatively high
rates of Cant, increase of 0.53 ± 0.11
and 0.36 ± 0.06 μmol kg−1 yr−1, respectively, has lead to
rapid acidification in the SAZ, and will continue to do so whilst
simultaneously reducing the chemical buffering capacity of this significant
CO2 sink. |
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