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| Titel |
Evidence for a multi-species coccolith volume change over the past two centuries: understanding a potential ocean acidification response |
| VerfasserIn |
P. R. Halloran, I. R. Hall, E. Colmenero-Hidalgo, R. E. M. Rickaby |
| 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 ; 5, no. 6 ; Nr. 5, no. 6 (2008-12-10), S.1651-1655 |
| Datensatznummer |
250002930
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| Publikation (Nr.) |
 copernicus.org/bg-5-1651-2008.pdf |
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| Zusammenfassung |
| Major questions surround the species-specific nature of coccolithophore
calcification in response to rising atmospheric CO2 levels. Here we
present CaCO3 particle volume distribution data from the coccolith
size-fraction of a rapidly accumulating North Atlantic sediment core.
Without direct volume measurements on coccoliths produced by individual
coccolithophore species, and knowledge of organic, as well as inorganic
carbon production, it is not possible to state conclusively the
coccolithophore calcification change at this site. However, by analysing the
size distribution of CaCO3 particles in the less than 10 μm
sediment fraction, we demonstrate a changing particle volume since the late
20th Century consistent with an increase in the mass of coccoliths
produced by the larger coccolithophore species, and potentially a decrease
in mass of coccoliths produced by the smaller species, present at this
location. This finding has significant implications for the realistic
representation of an assemblage-wide coccolithophore CO2-calcification
response in numerical models. |
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