fc3b33ce-beef-497f-b782-252fb65cc873 eng Ev-K2-CNR +39 035 3230511 +39 035 3230551 Via San Bernardino 145 Bergamo BG 24126 Italy metadata@evk2cnr.org http://www.evk2cnr.org/ 2014-06-29T16:59:09 ISO 19115:2003/19139 1.0 Ice ablation and meteorological conditions on the debris-covered area of Baltoro glacier, Karakoram, Pakistan by Claudia MIHALCEA,1 Christoph MAYER,2 Guglielmina DIOLAIUTI,1 Astrid LAMBRECHT,Claudio SMIRAGLIA,1 Gianni TARTARI4 - 1Department of Earth Sciences ‘Ardito Desio’, University of Milan, Via Mangiagalli 34, I-20133 Milan, Italy; 2Commission for Glaciology, Bavarian Academy of Sciences and Humanities, Marstallplatz 8, D-80539 Munich, Germany; 3Institute for Meteorology and Geophysics, University of Innsbruck, Innrain 52, A-6020 Innsbruck, Austria; 4CNR–IRSA, Water Research Institute/National Research Council, Localita` Occhiate, I-20047 Brugherio, Milan, Italy 2011-06-10T08:00:00 Annals of Glaciology 43 During the recent Italian expedition ‘K2 2004 – 50 years later’ (June–July 2004) on Baltoro glacier, Karakoram, Pakistan, glaciological field experiments were carried out on the debris-covered area of this high-elevation glacier. The aim was to investigate the ice ablation and its relations with debris thermal properties and meteorological conditions. Ablation measurements along the glacier up to about 5000m and within a dedicated test field were combined with meteorological data from two automatic weather stations located at Urdukas (4022ma.s.l.) and at K2 Base Camp (5033ma.s.l.). In addition, temperature measurements of the debris cover at different depth levels along the glacier allowed the calculation of debris surface temperature and of the debris thermal resistance (R). Using the air temperature, the local mean lapse rate (0.00758 K/m) and the measured ablation, the degree-day factors (K) at different locations on the glacier were calculated. The ice ablation rates were related to debris thickness and elevation. They are typically on the order of 4cm/ day during the observation period. However, it was found that the surface topography (slope, aspect) has an influence on the total ablation similar to that of the debris thickness. Thermal resistance of the debris cover and its distribution over the glacier were estimated. Finally, a best-guess estimate of the total meltwater production was calculated from available climate data. Claudia Mihalcea Università degli Studi di Milano Italy claudia.mihalcea@unimi.it http://www.igsoc.org/annals/ Christoph Mayer bavarian Academy of Sciences and Humanities Germany Christoph Mayer <Christoph.Mayer@lrz.badw-muenchen.de> Guglielmina Diolaiuti Università degli Studi di Milano Italy guglielmina.diolaiuti@unimi.it https://geoportal.mountaingenius.org/geonetwork/srv/eng/resources.get?uuid=fc3b33ce-beef-497f-b782-252fb65cc873&fname=mountain_witness__s.png thumbnail png karakoram, debris covered glacier, buried ice ablation SHARE SEED eng -180 180 -90 90 WWW:LINK-1.0-http--link