ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] Past variations of atmospheric CH4 concentrations can be reconstructed by analysing the composition of bubbles trapped in polar ice sheets. Air filling the pore space in firn is enclosed when firn sinters to ice. The enclosure occurs at a depth of typically 70 m below the surface in a slow, ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/366443a0