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| Titel |
The seasonal cycle of δ³CDIC in the North Atlantic subpolar gyre |
| VerfasserIn |
V. Racapé, N. Metzl, C. Pierre, G. Reverdin, P. D. Quay, S. R. Olafsdottir |
| 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 ; 11, no. 6 ; Nr. 11, no. 6 (2014-03-28), S.1683-1692 |
| Datensatznummer |
250117313
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| Publikation (Nr.) |
 copernicus.org/bg-11-1683-2014.pdf |
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| Zusammenfassung |
| This study introduces for the
first time the δ13CDIC seasonality in the North Atlantic
subpolar gyre (NASPG) using δ13CDIC data obtained in
2005–2006 and 2010–2012 with dissolved inorganic carbon (DIC) and nutrient
observations. On the seasonal scale, the NASPG is characterized by higher
δ13CDIC values during summer than during winter, with a
seasonal amplitude between 0.70 ± 0.10‰
(August 2010–March 2011) and 0.77 ± 0.07‰ (2005–2006). This
is mainly attributed to photosynthetic activity in summer and to a deep
remineralization process during winter convection, sometimes influenced by
ocean dynamics and carbonate pumps. There is also a strong and negative
linear relationship between δ13CDIC and DIC during all
seasons. Winter data also showed a large decrease in
δ13CDIC associated with an increase in DIC between 2006
and 2011–2012, but the observed time rates (−0.04‰ yr−1and
+1.7 μmol kg−1 yr−1) are much larger than the
expected anthropogenic signal. |
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