A full Stokes ice-flow model to assist the interpretation of millennial-scale ice cores at the high-Alpine drilling site Colle Gnifetti, Swiss/Italian Alps

• Verfasst von: Licciulli, Carlo [VerfasserIn]
• Verfasst von: Bohleber, Pascal [VerfasserIn]
• Verfasst von: Lier, Josef [VerfasserIn]
• Verfasst von: Gagliardini, Olivier [VerfasserIn]
• Verfasst von: Hölzle, Martin [VerfasserIn]
• Verfasst von: Eisen, Olaf [VerfasserIn]
• Titel: A full Stokes ice-flow model to assist the interpretation of millennial-scale ice cores at the high-Alpine drilling site Colle Gnifetti, Swiss/Italian Alps
• Verf.angabe: Carlo Licciulli, Pascal Bohleber, Josef Lier, Olivier Gagliardini, Martin Hoelzle and Olaf Eisen
• Jahr: 2020
• Jahr des Originals: 2019
• Umfang: 14 S.
• Fussnoten: Gesehen am 19.12.2019 ; Published online 19 November 2019
• Titel Quelle: Enthalten in: Journal of glaciology
• Ort Quelle: Cambridge : Cambridge University Press, 1947
• Jahr Quelle: 2020
• Band/Heft Quelle: 66(2020), 255, Seite 35-48
• ISSN Quelle: 1727-5652
• DOI: doi:10.1017/jog.2019.82
• Datenträger: Online-Ressource
• Sprache: eng
• Bibliogr. Hinweis: Forschungsdaten: Licciulli, Carlo, 1988 - : Ice-flow modeling results to assist the interpretation of millennial-scale ice cores recovered at the high-Alpine ice drilling site Colle Gnifetti, Swiss/Italian Alps
• Bibliogr. Hinweis: Forschungsdaten: Licciulli, Carlo, 1988 - : Model calculated catchment area and ages of the ice-core KCI at the high-Alpine ice drilling site Colle Gnifetti, Swiss/Italian Alps
• Bibliogr. Hinweis: Forschungsdaten: Licciulli, Carlo, 1988 - : Inclination data of the borehole KCI at the high-Alpine ice drilling site Colle Gnifetti, Swiss/Italian Alps
• Bibliogr. Hinweis: Forschungsdaten: Licciulli, Carlo, 1988 - : Inclination data of the borehole KCC at the high-Alpine ice drilling site Colle Gnifetti, Swiss/Italian Alps
• Bibliogr. Hinweis: Forschungsdaten: Licciulli, Carlo, 1988 - : Model calculated catchment area and ages of the ice-core KCC at the high-Alpine ice drilling site Colle Gnifetti, Swiss/Italian Alps
• Sach-SW: Glacier modeling
• Sach-SW: ice dynamics
• Sach-SW: mountain glaciers
• Sach-SW: paleoclimate
• K10plus-PPN: 1686069952

Abstract

The high-Alpine ice-core drilling site Colle Gnifetti (CG), Monte Rosa, Swiss/Italian Alps, provides climate records over the last millennium and beyond. However, the full exploitation of the oldest part of the existing ice cores requires complementary knowledge of the intricate glacio-meteorological settings, including glacier dynamics. Here, we present new ice-flow modeling studies of CG, focused on characterizing the flow at two neighboring drill sites in the eastern part of the glacier. The3-D full Stokes ice-flow model is thermo-mechanically coupled and includes firn rheology, firn densification and enthalpy transport, and is implemented using the finite element software Elmer/Ice. Measurements of surface velocities, accumulation, borehole inclination, density and englacial temperatures are used to validate the model output. We calculate backward trajectories and map the catchment areas. This constrains, for the first time at this site, the so-called upstream effects for the stable water isotope time series of the two ice cores drilled in 2005 and 2013. The model also provides a 3-D age field of the glacier and independent ice-core chronologies for five ice-core sites. Model results are a valuable addition to the existing glaciological and ice-core datasets. This especially concerns the quantitative estimate of upstream conditions affecting the interpretation of the deep ice-core layers.