 |
| Titel |
Dissolution of calcium carbonate: observations and model results in the subpolar North Atlantic |
| VerfasserIn |
K. Friis, R. G. Najjar, M. J. Follows, S. Dutkiewicz, A. Körtzinger, K. M. Johnson |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 4, no. 2 ; Nr. 4, no. 2 (2007-03-20), S.205-213 |
| Datensatznummer |
250001619
|
| Publikation (Nr.) |
 copernicus.org/bg-4-205-2007.pdf |
|
|
|
|
|
| Zusammenfassung |
| We investigate the significance of in situ dissolution of calcium carbonate above
its saturation horizons using observations from the open subpolar North
Atlantic [sNA] and to a lesser extent a 3-D biogeochemical model. The sNA is
particularly well suited for observation-based detections of in situ, i.e. shallow-depth
CaCO3 dissolution [SDCCD] as it is a region of high
CaCO3 production, deep CaCO3 saturation horizons, and
precisely-defined pre-formed alkalinity. Based on the analysis of a comprehensive
alkalinity data set we find that SDCCD does not appear to be a significant
process in the open sNA. The results from the model support the
observational findings by indicating that there is not a significant need of
SDCCD to explain observed patterns of alkalinity in the North Atlantic.
Instead our investigation points to the importance of mixing processes for
the redistribution of alkalinity from dissolution of CaCO3 from below
its saturation horizons. However, mixing has recently been neglected for a
number of studies that called for SDCCD in the sNA and on global scale. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|