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| Titel |
Glacial-interglacial atmospheric CO2 change: a possible "standing volume" effect on deep-ocean carbon sequestration |
| VerfasserIn |
L. C. Skinner |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 5, no. 3 ; Nr. 5, no. 3 (2009-09-30), S.537-550 |
| Datensatznummer |
250002551
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| Publikation (Nr.) |
 copernicus.org/cp-5-537-2009.pdf |
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| Zusammenfassung |
| So far, the exploration of possible mechanisms for glacial atmospheric CO2
drawdown and marine carbon sequestration has tended to focus on dynamic or
kinetic processes (i.e. variable mixing-, equilibration- or export rates).
Here an attempt is made to underline instead the possible importance of
changes in the standing volumes of intra-oceanic carbon reservoirs
(i.e. different water-masses) in influencing the total marine carbon
inventory. By way of illustration, a simple mechanism is proposed for
enhancing the marine carbon inventory via an increase in the volume of
relatively cold and carbon-enriched deep water, analogous to modern Lower
Circumpolar Deep Water (LCDW), filling the ocean basins. A set of simple
box-model experiments confirm the expectation that a deep sea dominated by an
expanded LCDW-like watermass holds more CO2, without any pre-imposed
changes in ocean overturning rate, biological export or ocean-atmosphere
exchange. The magnitude of this "standing volume effect" (which operates by
boosting the solubility- and biological pumps) might be as large as the
contributions that have previously been attributed to carbonate compensation,
terrestrial biosphere reduction or ocean fertilisation for example. By
providing a means of not only enhancing but also driving changes in the
efficiency of the biological- and solubility pumps, this standing volume
mechanism may help to reduce the amount of glacial-interglacial CO2 change
that remains to be explained by other mechanisms that are difficult to assess
in the geological archive, such as reduced mass transport or mixing rates in
particular. This in turn could help narrow the search for forcing conditions
capable of pushing the global carbon cycle between glacial and interglacial
modes. |
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