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 5000 m and within a dedicated test field were combined with meteorological data from two automatic weather stations located at Urdukas (4022 ma.s.l.)and at K2 Base Camp (5033 ma.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 (0.0075 8 Cm –1 )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 4 cm d –1 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.

Ice ablation and meteorological conditions on the debris covered area of Baltoro Glacier (Karakoram, Pakistan) / C. Mihalcea, C. Mayer, G. Diolaiuti, A. Lambrecht, C. Smiraglia, G. Tartari. - In: ANNALS OF GLACIOLOGY. - ISSN 0260-3055. - 43:1(2006), pp. 292-300. [10.3189/172756406781812104]

Ice ablation and meteorological conditions on the debris covered area of Baltoro Glacier (Karakoram, Pakistan)

C. Mihalcea;G. Diolaiuti;C. Smiraglia;
2006

Abstract

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 5000 m and within a dedicated test field were combined with meteorological data from two automatic weather stations located at Urdukas (4022 ma.s.l.)and at K2 Base Camp (5033 ma.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 (0.0075 8 Cm –1 )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 4 cm d –1 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.
Settore GEO/04 - Geografia Fisica e Geomorfologia
Article (author)
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/27053
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 157
  • ???jsp.display-item.citation.isi??? 152
social impact