Related Experiment Video
Updated: Apr 27, 2026

Multimodal Optical Microscopy Methods Reveal Polyp Tissue Morphology and Structure in Caribbean Reef Building Corals
Published on: September 5, 2014
Anthropogenic and solar forcing in δ13C time pattern of coralline sponges
Paolo Madonia1, Joachim Reitner
1a Istituto Nazionale di Geofisica e Vulcanologia , Sezione di Palermo, Palermo , Italy.
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 δ(13)C 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 δ(13)C versus time and the δ(13)C versus carbon emission curves.
Related Concept Videos
Global Climate Change
The Carbon Cycle
¹³C NMR: ¹H–¹³C Decoupling
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Diversity of Protists III
Microbes and Climate Change

