Image: Delta-O-18 in deep sea sediment

Description: δ18O ppm in deep sea sediment for aminifera carbonates over time from 0-600,000 years. Averaged over a large number of cores in order to isolate a global signal. Original caption: "The variations of 18O in carbonate averaged over a large number of different cores (in order to isolate a global signal) over the last 600,000 years. Most clear are the regular oscillations of the glacial ice volume which follows small changes to Earth's orbit around the Sun (Milankovitch forcing)." cited as reference: Schmidt, G.A. 1999. Forward modeling and interpretation of carbonate proxy data using oxygen isotope tracers in a global ocean model. Paleoceanography 14, 482-497.[1] (however, this image is not part of the cited publication).
Title: Delta-O-18 in deep sea sediment
Credit: "Science Briefs: Cold Climates, Warm Climates: How Can We Tell Past Temperatures?" (giss.nava.gov) direct link to image: http://www.giss.nasa.gov/research/briefs/schmidt_01/specmap.GIF
Author: Gavin Schmidt
Usage Terms: Public domain
License: Public domain
Attribution Required?: No