What do SST proxies really tell us? A high-resolution multiproxy (UK'37, TEXH86 and foraminifera d18O) study in the Gulf of Taranto, central Mediterranean Sea

Grauel, A. L. and Leider, Arne and Goudeau, Marie-Louise S. and Muller, Inigo A. and Bernasconi, Stefano M. and Hinrichs, Kai-Uwe and de Lange, Gert J. and Zonneveld, Gerard J.M. (2013) What do SST proxies really tell us? A high-resolution multiproxy (UK'37, TEXH86 and foraminifera d18O) study in the Gulf of Taranto, central Mediterranean Sea. Quaternary Science Reviews, 73. pp. 115-131. ISSN 0277-3791 DOI 10.1016/j.quascirev.2013.05.007

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Abstract

Abstract We present a multiproxy reconstruction of sea surface temperatures (SST) and coastal environmental changes covering the last 600 years on sediments from the Gulf of Taranto, central Mediterranean Sea. The reconstruction is based on UK'37 (alkenones from haptophytes), TEXH86 (membrane lipids of marine crenarchaeota), and d18O and d13C of Globigerinoides ruber (white and pink) and of Uvigerina mediterranea. The amplitudes of the temperature signals reconstructed from δ18O of G. ruber (white), TEXH86 and UK'37 exceed the amplitudes observed in other reconstructions of local and Northern Hemisphere temperature. UK�37-based SSTs reflect mainly winter/spring conditions with an additional influence of changing nutrient supplies related to water column mixing and runoff. TEXH86-based temperatures reflect SSTs of the oligotrophic summer season, while influences from near-coastal areas may complicate its interpretation. Co-variation between both lipid-based SST records suggests a common environmental mechanism during the last 600 years. δ18O of G. ruber (white) also reflects summer conditions and is amplified by changes in salinity and nutrient availability, which are caused by variations in the relative influence of the Western Adriatic Current (WAC) and of the Ionian Surface Waters (ISW). The combination of SST TEX H 86 and δ18O of G. ruber (white) shows that the circulation in the Gulf of Taranto underwent significant changes during the last 600 years.

Item Type: Article
Uncontrolled Keywords: NIL AREP
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Quaternary Science Reviews
Volume: 73
Page Range: pp. 115-131
Identification Number: 10.1016/j.quascirev.2013.05.007
Depositing User: Sarah Humbert
Date Deposited: 30 Aug 2013 17:15
Last Modified: 30 Aug 2013 17:15
URI: http://eprints.esc.cam.ac.uk/id/eprint/2874

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