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Seasonal Variations of Isotope Ratios and CO2 Concentrations in Firn Air

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/45452

Title: Seasonal Variations of Isotope Ratios and CO2 Concentrations in Firn Air
Authors: Weiler, Karin Browse this author
Schwander, Jakob Browse this author
Leuenberger, Markus Browse this author
Blunier, Thomas Browse this author
Mulvaney, Robert Browse this author
Anderson, Philip S. Browse this author
Salmon, Rhian Browse this author
Sturges, William T. Browse this author
Keywords: firn air
thermal diffusion
thermal diffusion sensitivity
C02
Halley
Issue Date: Dec-2009
Publisher: Institute of Low Temperature Science, Hokkaido University
Citation: Physics of Ice Core Records II : Papers collected after the 2nd International Workshop on Physics of Ice Core Records, held in Sapporo, Japan, 2-6 February 2007. Edited by Takeo Hondoh
Journal Title: 低温科学
Journal Title(alt): Low Temperature Science
Volume: 68
Issue: Supplement
Start Page: 247
End Page: 272
Abstract: A first year-round firn air sampling carried out at the British Antarctic station Halley in 2003 shows isotope and CO2 changes owing to diffusive mixing driven by seasonal variations of surface temperature, and gas composition of the atmosphere. Seasonal firn temperatures are well reproduced from the atmospheric temperature history. Based on these profiles thermal diffusion is forced with thermal diffusion factors αT with respect to air. Application of the available literature data for αT (15N14 / N2) leads to a proper prediction of the seasonal thermal amplitude during the entire year. By forcing thermal fractionation with αT as derived from two different model approaches and taking into account literature data reasonable results can be achieved for CO2 but not for thermal fractionation of 18016O and 16O2 in air. The latter is attributed to an inappropriate reproduction of the intermolecular interaction forces by either model. Neither thermal diffusion nor annual variations in the atmospheric CO2 concentration seem to have a substancial effect on the CO2 concentration finally conserved in air bubbles at the close-off level.
Description: III. Firn densification, close-off and chronology
Type: bulletin (article)
URI: http://hdl.handle.net/2115/45452
Appears in Collections:低温科学 = Low Temperature Science > vol. 68, Supplement Issue

Submitter: 低温科学研究所図書室

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