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| Titel |
Carbonate saturation state of surface waters in the Ross Sea and Southern Ocean: controls and implications for the onset of aragonite undersaturation |
| VerfasserIn |
H. B. DeJong, R. B. Dunbar, D. Mucciarone, D. A. Koweek |
| 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 (2015-12-02), S.6881-6896 |
| Datensatznummer |
250118188
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| Publikation (Nr.) |
 copernicus.org/bg-12-6881-2015.pdf |
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| Zusammenfassung |
| Predicting when surface waters of the Ross Sea and Southern Ocean will
become undersaturated with respect to biogenic carbonate minerals is
challenging in part due to the lack of baseline high-resolution carbon
system data. Here we present ~ 1700 surface total alkalinity
measurements from the Ross Sea and along a transect between the Ross Sea and
southern Chile from the austral autumn (February–March 2013). We calculate the
saturation state of aragonite (ΩAr) and calcite (Ω
Ca) using measured total alkalinity and pCO2. In the Ross Sea and
south of the Polar Front, variability in carbonate saturation state (Ω)
is mainly driven by algal photosynthesis. Freshwater dilution and
calcification have minimal influence on Ω variability. We estimate
an early spring surface water ΩAr value of ~ 1.2
for the Ross Sea using a total alkalinity–salinity relationship and
historical pCO2 measurements. Our results suggest that the Ross Sea is
not likely to become undersaturated with respect to aragonite until the year
2070. |
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