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Coherent millennial-scale patterns in Uk'37 and TEX86H temperature records during the penultimate interglacial-to-glacial cycle in the western Mediterranean
Huguet, Carme (Huguet Micheo) (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Martrat, Belen (Institut de Diagnòstic Ambiental i Estudis de l'Aigua)
Grimalt, Joan (Institut de Diagnosi Ambiental i Estudis de l'Aigua)
Sinninghe Damsté, Jaap S. (Royal Netherlands Institute for Sea Research. Department of Marine Organic Biogeochemistry)
Schouten, Stefan (Royal Netherlands Institute for Sea Research. Department of Marine Organic Biogeochemistry)

Data: 2011
Resum: The TEX86H temperature proxy is a relatively new proxy based on crenarchaeotal lipids and has rarely been applied together with other temperature proxies. In this study, we applied the TEX86H on a sediment core from the Alboran Sea (western Mediterranean, core ODP-977A) covering the penultimate climate cycle, that is, from 244 to 130 ka, and compared this with previously published sea surface temperatures derived from the U37k' of alkenones of haptophyta and Mg/Ca records of planktonic foraminifera. The TEX86H temperature record shows remarkably similar stadial-interstadial patterns and abrupt temperature changes to those observed with the U37k' palaeothermometer. Absolute TEX86H temperature estimates are generally higher than those of U37k', though this difference (<3°C in 81% of the data points) is mainly within the temperature calibration error for both proxies, suggesting that crenarchaeota and haptophyta experienced similar temperature variations. During occasional events (<5% of the analyzed time span), however, the TEX86H exhibits considerably higher absolute temperature estimates than the U37k'. Comparison with Mg/Ca records of planktonic foraminifera as well as other Mediterranean TEX86 and U37k' records suggests that part of this divergence may be attributed to seasonal differences, that is, with TEX86H reflecting mainly the warm summer season while U37k' would show annual mean. Biases in the global calibration of both proxies or specific biases in the Mediterranean are an alternative, though less likely, explanation. Despite differences between absolute TEX86H and U37k' temperatures, the correlation between the two proxies (r2 = 0. 59, 95% significance) provides support for the occurrence of abrupt temperature variations in the western Mediterranean during the penultimate interglacial-to-glacial cycle.
Ajuts: Ministerio de Economía y Competitividad CSD2007-00067
Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-1178
Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-1305
Drets: Tots els drets reservats.
Llengua: Anglès
Document: Article ; Versió publicada
Matèria: Paleoclimatologia ; Meteorologia marina
Publicat a: Paleoceanography, Vol. 26, Issue 2 (June 2011) , ISSN 1944-9186

DOI: 10.1029/2010PA002048

10 p, 2.5 MB

El registre apareix a les col·leccions:
Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > Institut de Ciència i Tecnologia Ambientals (ICTA)
Articles > Articles publicats

 Registre creat el 2008-04-21, darrera modificació el 2023-06-12

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