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| Titel |
Incremental task: Extending the existing 109 year Fladen Ground master chronology using the annual increments of the ocean quahog Arctica islandica |
| VerfasserIn |
Juan Estrella-Martínez, Paul Butler, James Scourse, Christopher Richardson |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250108554
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| Publikation (Nr.) |
 EGU/EGU2015-8315.pdf |
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| Zusammenfassung |
| Much of our understanding of climate comes from studying proxy archives from an
array of sources. While there exist a good number of high resolution archives from
terrestrial sources, the marine environment has been hindered with a low number of
precisely-resolved records, especially in the high latitudes where the conditions
for the development of natural archives such as corals and varved sediments are
hard to come by. In the last 25 to 30 years there have been developments that show
that certain species of mollusks can be used to study oceanographic conditions on
much more detailed time scales. We present an extension of a chronology from the
Fladen Ground, northern North Sea that was constructed using the shells of Arctica
islandica (Bivalvia). A. islandica shows relatively easy-to-measure annual increments
that can be cross-matched within and between populations as far as 80 km from
each other maintaining a common signal. The width of the growth increments has
been related to environmental factors such as water temperature, food availability
and food quality (primary productivity). The existing chronology spans most of
the 20th century and the last 30 years of the 19th century. Shells collected on the
past few years have been absolutely-dated using 14C and show that the Fladen
Ground chronology can be potentially extended back to the 5th century. Such data
will be a great resource for developing climate models that can more accurately
reproduce past conditions and give more reliable predictions of the future climate. |
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