NDLI: Seasonality in the North Sea during the Allerød and Late Medieval Climate Optimum using bivalve sclerochronology

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Seasonality in the North Sea during the Allerød and Late Medieval Climate Optimum using bivalve sclerochronology

Content Provider	Springer Nature Link
Author	Schöne, Bernd R. Fiebig, Jens
Copyright Year	2008
Abstract	Seasonal temperature patterns may have changed through time in response to current global warming. However, the temporal resolution of available proxy records is not sufficient to quantify paleotemperature seasonality prior to anthropogenic forcing of the climate. In the present study, we reconstructed seasonal and inter-annual temperature patterns of the North Sea during the last 140 years, the Allerød Interglacial and the Late Medieval Climate Optimum using sclerochronological and δ18Oaragonite data from bivalve shells, Arctica islandica. On average, the climate during 1278–1353 AD was ca. 1.1°C colder and seasonality was ca. 60% less than today. During the Allerød, long-term temperatures remained about 3.2°C below present values, and absolute summer and winter anomalies were ca. −4 and −2.7°C, respectively. However, seasonality was statistically indistinguishable from today. Long-term average temperatures compare well with existing data for the Late Medieval and Allerød, but detailed information on seasonality during the studied time intervals has never been presented before. Our data also demonstrated that annual instrumental and δ18Oaragonite-derived temperatures did not always match. This difference is explained by (1) NAO-driven salinity changes, which influence the temperature estimation from δ18Oaragonite and (2) food-driven changes in growth rates; portions of the shell that formed more rapidly are overrepresented in carbonate samples. Our study indicated that individual bivalve shells can open discrete, near-century long, ultra-high-resolution windows into the climate past. Such information can be vital for testing and verifying numerical climate models.
Starting Page	83
Ending Page	98
Page Count	16
File Format	PDF
ISSN	14373254
Journal	International Journal of Earth Sciences
Volume Number	98
Issue Number	1
e-ISSN	14373262
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-08-29
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Paleoseasonality Paleoclimate oscillations Arctica islandica Growth rates Oxygen isotopes Geology Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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