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| Titel |
Temperature and stratification in the Irish Sea: analysis of a 489-year marine master chronology derived from growth increments in the shell of the clam Arctica islandica |
| VerfasserIn |
P. G. Butler, C. A. Richardson, J. D. Scourse, A. D. Wanamaker Jr, T. M. Shammon, J. D. Bennell |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250020652
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| Zusammenfassung |
| We demonstrate here that the growth increment variability in the shell of
the long-lived bivalve mollusc Arctica islandica can potentially be used
as a proxy for marine environmental change on multi-centennial timescales
in the climatically important North Atlantic shelf seas. Crossdated
chronologies of up to 489 years have been constructed using three
different detrending techniques (negative exponential function, segment
length dependent spline and regional curve standardization) designed to
preserve low-frequency signals, and their characteristics compared. The
strength of the common environmental signal expressed in the chronologies
is fully comparable with equivalent statistics for tree-ring chronologies.
The chronologies are compared with the 350-year Central England Temperature
record and with seawater temperature records from stations close to the
study site in the Irish Sea. Correlations are demonstrated between shell
growth and (air and seawater) temperatures for the year of growth and for the
previous year. Changes over time in low-frequency correlations with air
temperatures and towards a deeper water origin for the shells in the
chronology indicate that shell growth can be used to study stratification
dynamics. |
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