Determining the age distribution of Colle Gnifetti, Monte Rosa, Alps, by combining ice cores, ground-penetrating radar and a simple flow model


Contact
Olaf.Eisen [ at ] awi.de

Abstract

Ice cores from cold Alpine glaciers may provide unique paleoclimate information fromnon-polar latitudes. We explore the three-dimensional internal age distribution of the small cold glaciersaddle (Colle Gnifetti, Monte Rosa, Italy/Switzerland) to compare the age/depth relations from fourlocal deep ice cores. Tracking isochronous refection horizons detected by ground-penetrating radar(GPR) among the core locations reveals consistent dating up to 80 yearsbp. This approach is confned torecent ages,duetothelackofclearrefectionsbelowthefrn/icetransition.Weattempttoovercomethislimitation by including a two-dimensional fow model adapted to the GPR-derived surface accumulationand ice thickness distribution. Modeled and GPR isochrones are compared, indicating agreement inshape but featuring a potential offset of 0–3.5m. The modeled isochrones are interpolated to the corearray with ages assigned according to the ice-core datings. The resulting age distribution is consistentup to 110 yearsbp, with age uncertainties increasing from 7 to>80 years in the lower half of the ice.This combination of methods is novel for Alpine sites and may be adapted for spatial extrapolation ofice properties other than age



Item Type
Article
Authors
Divisions
Programs
Peer revision
Scopus/ISI peer-reviewed
Publication Status
Published
Eprint ID
25894
DOI 10.3189/2013JoG12J072

Cite as
Konrad, H. , Bohleber, P. , Wagenbach, D. , Vincent, C. and Eisen, O. (2013): Determining the age distribution of Colle Gnifetti, Monte Rosa, Alps, by combining ice cores, ground-penetrating radar and a simple flow model , Journal of Glaciology, 59 (213), pp. 179-189 . doi: 10.3189/2013JoG12J072


Share


Citation

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item