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| Titel |
Holocene reservoir age corrections for the Norwegian Sea based on cold-water corals |
| VerfasserIn |
Carin Andersson Dahl, Henriette Linge, Philippa Ascough, Jan Fietske, Richard Telford |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250038772
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| Zusammenfassung |
| There is an offset in 14C age in organisms that lived contemporaneously in the atmosphere
relative to those that lived in other carbon reservoirs, such as the ocean. Information about
this offset, or reservoir age, R(t), is needed to accurately calibrate marine 14C dates.
Although the reservoir age of the ocean is not constant, difficulties in reconstruction the
temporal changes in R(t) through time often result in the use of a constant reservoir age
correction based on the pre-industrial estimate. This makes detailed comparisons
between different archives difficult. Holocene cold-water corals are abundant on the
Norwegian shelf and can be dated independently using two different radiometric
dating method. The reservoir age correction (ÎR) of surface ocean waters in the
eastern Norwegian Sea was determined for two Holocene periods (9763-9262 and
3097-365 cal. BP) using paired U/Th and AMS 14C dating of nineteen samples of the
cold-water coral Lophelia pertusa. Assessment of Holocene ÎR values show that early
Holocene ÎR values are higher compared to the late Holocene. In addition, there also
appears to be a trend of increasing ÎR values for the past 3000 years BP in the
eastern Norwegian Sea. Comparisons to ÎR values from the British Isles point
towards that there is a latitudinal dependence in ÎR in the North Atlantic realm. |
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