Instrumental validation of Globigerinoides ruber Mg/Ca as a proxy for NE Pacific summer SST
Mortyn, P. Graham (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Herguera, Juan Carlos (Centro de Investigación Científica y Educación Superior de Ensenada. Departamento de Oceanografía)
Martínez Botí, M. A. (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)

Data:	2011
Resum:	Accurate reconstruction of sea surface temperature (SST) is a high research priority, given that it is such a crucial variable in the Earth's climate system. The Mg/Ca composition of Globigerinoides ruber (white) has been calibrated and applied for a number of tropical and extratropical paleo-SST reconstructions, though validation studies of the proxy against instrumental observations are relatively scarce. Here we present a validation of G. ruber Mg/Ca-derived SSTs against instrumental summer values, firstly from the modern seasonal water column perspective, and secondly from a 20th century observational time series. The study occurs in the San Lázaro Basin (SLB), one of the marginal basins in the NE Pacific known for very high sedimentation rates, excellent preservation, laminated sequences, and the ability to record upwelling processes on high-resolution timescales, from interannual climatic variability (El Niño / Southern Oscillation (ENSO)) to interdecadal (e. g. , the Pacific Decadal Oscillation (PDO)). Results suggest that the proxy best reflects the summer season. The proxy-instrument time-series comparison for summer SSTs displays remarkable agreement, driven largely by ENSO cycles for the past century, with some events missing due to scarcity of foraminiferal specimens and/or lack of sufficient temporal resolution. This study validates the G. ruber Mg/Ca proxy for summer SSTs in this region, and suggests its high fidelity to reconstruct summer SST from SLB over longer timescales to record multi-decadal and multi-centennial variabilities.
Ajuts:	Ministerio de Ciencia e Innovación CTM2006-11936 Ministerio de Ciencia e Innovación CGL2009-10806
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Earth's climate system ; Sea surface temperature
Publicat a:	Geophysical research letters, Vol. 38 Issue 16 (August 2011) , ISSN 0094-8276

DOI: 10.1029/2011GL047803

5 p, 851.5 KB

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