Articles | Volume 12, issue 4
Clim. Past, 12, 1061–1077, 2016

Special issue: International Partnerships in Ice Core Sciences (IPICS) Second...

Clim. Past, 12, 1061–1077, 2016
Research article
26 Apr 2016
Research article | 26 Apr 2016

Local artifacts in ice core methane records caused by layered bubble trapping and in situ production: a multi-site investigation

Rachael H. Rhodes et al.

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Short summary
Local artifacts in ice core methane data are superimposed on consistent records of past atmospheric variability. These artifacts are not related to past atmospheric history and care should be taken to avoid interpreting them as such. By investigating five polar ice cores from sites with different conditions, we relate isolated methane spikes to melt layers and decimetre-scale variations as "trapping signal" associated with a difference in timing of air bubble closure in adjacent firn layers.