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

• Verfasst von: May, Barbara Luise [VerfasserIn]
• Verfasst von: Wagenbach, Dietmar [VerfasserIn]
• Verfasst von: Hoffmann, Helene [VerfasserIn]
• Verfasst von: Legrand, M. [VerfasserIn]
• Verfasst von: Preunkert, S. [VerfasserIn]
• Verfasst von: Steier, P. [VerfasserIn]
• Titel: Constraints on the major sources of dissolved organic carbon in Alpine ice cores from radiocarbon analysis over the bomb-peak period
• Verf.angabe: B. May, D. Wagenbach, H. Hoffmann, M. Legrand, S. Preunkert, and P. Steier
• E-Jahr: 2013
• Jahr: 16 April 2013
• Umfang: 9 S.
• Fussnoten: 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
• Titel Quelle: Enthalten in: Journal of geophysical research. Atmospheres
• Ort Quelle: Hoboken, NJ : Wiley, 2013
• Jahr Quelle: 2013
• Band/Heft Quelle: 118(2013), 8, Seite 3319-3327
• ISSN Quelle: 2169-8996
• DOI: doi:10.1002/jgrd.50200
• Datenträger: Online-Ressource
• Sprache: eng
• Bibliogr. Hinweis: Ergänzung: Legrand, Michel: Major 20th century changes of the content and chemical speciation of organic carbon archived in Alpine ice cores
• Sach-SW: Alpine ice core
• Sach-SW: biogenic sources
• Sach-SW: bomb peak
• Sach-SW: dissolved organic carbon
• Sach-SW: radiocarbon
• K10plus-PPN: 1761630881

Abstract

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.