Climate of the Past
Climate of the Past
CP
Articles | Volume 12, issue 4
Articles | Volume 12, issue 4
https://doi.org/10.5194/cp-12-1061-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Special issue:
https://doi.org/10.5194/cp-12-1061-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 12, issue 4
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, Xavier Faïn, Edward J. Brook, Joseph R. McConnell, Olivia J. Maselli, Michael Sigl, Jon Edwards, Christo Buizert, Thomas Blunier, Jérôme Chappellaz, and Johannes Freitag

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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.
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International Partnerships in Ice Core Sciences (IPICS) Second...