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Authors: Madonia, P.* 
Reitner, J.* 
Title: Anthropogenic and solar forcing in δ13C time pattern of coralline sponges
Journal: Isotopes in Environmental and Health Studies 
Series/Report no.: 4/50(2014)
Publisher: Taylor & Francis Group
Issue Date: Dec-2014
DOI: 10.1080/10256016.2014.929577
Keywords: carbon-13; Caribbean Sea; coral reef; isotope ecology; isotope geochemistry; paleoclimate
Subject Classification01. Atmosphere::01.01. Atmosphere::01.01.02. Climate 
Abstract: We present the results of a re-analysis of a previously published carbon isotope data-set related to coralline sponges in the Caribbean Sea. The original interpretation led to the discrimination between a pre-industrial period, with a signal controlled by solar-induced climatic variations, followed by the industrial era, characterized by a progressive δ13C negative shift due to the massive anthropogenic carbon emissions. Our re-analysis allowed to extract from the raw isotopic data evidence of a solar forcing still visible during the industrial era, with a particular reference to the 88-year Gleissberg periods. These signals are related to slope changes in both the δ13C versus time and the δ13C versus carbon emission curves.
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