Meteorology and surface energy fluxes in the 2005-2007 ablation seasons at the Miage debris-covered glacier, Mont Blanc Massif, Italian Alps

Ben W. Brock, Claudia Mihalcea, Martin P. Kirkbride, Guglielmina Diolaiuti, Mark E. J. Cutler, Claudio Smiraglia

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    Abstract

    During the 2005-2007 June-September ablation seasons, meteorological conditions were recorded on the lower and upper parts of the debris covered ablation zone of Miage Glacier, Italy. In 2005, debris temperature and subdebris ice melt were also monitored at 25 points with debris thickness of 0.04-0.55 m, spread over 5 km2 of the glacier. The radiative fluxes were directly measured, and near closure of the surface energy balance is achieved, providing support for the bulk aerodynamic calculation of the turbulent fluxes. Surface layer meteorology and energy fluxes are dominated by the pattern of incoming solar radiation which heats the debris, driving strong convection. Mean measured subdebris ice melt rates are 6-33 mm d-1, and mean debris thermal conductivity is 0.96 W m-1 K-1, displaying a weak positive relationship with debris thickness. Mean seasonal values of the net shortwave, net longwave, and debris heat fluxes show little variation between years, despite contrasting meteorological conditions,the turbulent latent (evaporative) heat flux was more than twice as large in the wet summer of 2007 compared with 2005. The increase in energy output from the debris surface in response to increasing surface temperature means that subdebris ice melt rates are fairly insensitive to atmospheric temperature variations in contrast to debris free glaciers. Improved knowledge of spatial patterns of debris thickness distribution and 2 mair temperature, and the controls on evaporation of rainwater from the surface, are needed for distributed physically based melt modeling of debris covered glaciers. Copyright 2010 by the American Geophysical Union.
    Original languageEnglish
    Article numberD09106
    Pages (from-to)-
    Number of pages16
    JournalJournal of Geophysical Research: Atmospheres
    Volume115
    DOIs
    Publication statusPublished - May 2010

    Keywords

    • Cryosphere
    • Boundary layer processes
    • Energy balance
    • Glaciology
    • Snow and ice
    • Hydrology
    • Hydroclimatology
    • Atmospheric processes
    • Ablation
    • Glacier meteorology
    • Melt model

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