Physics – Geophysics
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30k..25s&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 11, pp. 25-1, CiteID 1571, DOI 10.1029/2003GL017093
Physics
Geophysics
19
Global Change: Atmosphere (0315, 0325), Hydrology: Snow And Ice (1827), Mathematical Geophysics: Modeling
Scientific paper
To reconstruct fast atmospheric trace gas variations from polar ice cores it has to be considered that their amplitudes are attenuated during the enclosure process in the ice. Relevant processes for the attenuation are the molecular diffusion in the open pores of the firn column and the gradual bubble close off in the depth of the transition from firn to ice. These processes depend mainly on temperature and accumulation rate and lead e.g. to a strong attenuation for cold sites with low accumulation rates. With a diffusion and enclosure model it is possible to calculate the attenuation for a single event and to compare ice core records from different sites. We investigate the atmospheric methane (CH4) variation during the cold event 8200 years ago and calculate that its amplitude as recorded in the EPICA Dome C ice core is attenuated to a magnitude between 34% and 59%.
Chappellaz Jérôme
Flückiger Jacqueline
Raynaud Dominique
Schwander Jakob
Spahni Renato
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