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Constraints on the major sources of dissolved organic carbon in Alpine ice cores from radiocarbon analysis over the bomb-peak period

Radiocarbon (14C) has proven to be a powerful tool in distinguishing modern and fossil fuel sources contributing to organic aerosols. By applying this concept to ice core records of the dissolved organic carbon (DOC) fraction, we developed a setup dedicated to the extraction of DOC from Alpine ice c...

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Hauptverfasser: May, Barbara Luise (VerfasserIn) , Wagenbach, Dietmar (VerfasserIn) , Hoffmann, Helene (VerfasserIn) , Legrand, M. (VerfasserIn) , Preunkert, S. (VerfasserIn) , Steier, P. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 16 April 2013
In: Journal of geophysical research. Atmospheres
Year: 2013, Jahrgang: 118, Heft: 8, Pages: 3319-3327
ISSN:2169-8996
DOI:10.1002/jgrd.50200
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1002/jgrd.50200
Verlag, lizenzpflichtig, Volltext: https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/jgrd.50200
Volltext
Verfasserangaben:B. May, D. Wagenbach, H. Hoffmann, M. Legrand, S. Preunkert, and P. Steier
Beschreibung
Zusammenfassung:Radiocarbon (14C) has proven to be a powerful tool in distinguishing modern and fossil fuel sources contributing to organic aerosols. By applying this concept to ice core records of the dissolved organic carbon (DOC) fraction, we developed a setup dedicated to the extraction of DOC from Alpine ice core samples for 14C microanalysis. With respect to the difficulties and limitations of this analytical method, it is shown that a total process blank mass of (6 ± 3) μgC with a 14C signature of (0.71 ± 0.17) can be obtained, corresponding to a minimum sample size between 200 g for industrial and 800 g for pre-industrial ice. Radiocarbon analyses of eight DOC ice core samples from the high accumulation glacier Col du Dôme (European Alps) were mainly performed over the bomb-peak period. These data, being associated with snow deposition over the summer half-years, show an overall mean fossil contribution of (25 ± 9) %. Adaptation of the DO14C values to the atmospheric 14CO2 record revealed that the biogenic input to ice core DOC is associated with a fast recycling biospheric component, likely linked to a turnover time of less than 3 years.
Beschreibung:Gesehen am 25.11.2021
Dieser Artikel ist eine Ergänzung zu Guilhermet et al. [2013] doi:10.1002/jgrd.50201 und Legrand [2013] doi:10.1002/jgrd.50202
Beschreibung:Online Resource
ISSN:2169-8996
DOI:10.1002/jgrd.50200

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