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Article Dans Une Revue The Cryosphere Année : 2014

Blowing snow in coastal Adelie Land, Antarctica: three atmospheric-moisture issues

Résumé

A total of 3 years of blowing-snow observations and associated meteorology along a 7 m mast at site D17 in coastal Adelie Land are presented. The observations are used to address three atmospheric-moisture issues related to the occurrence of blowing snow, a feature which largely affects many regions of Antarctica: ( 1) blowing-snow sublimation raises the moisture content of the surface atmosphere close to saturation, and atmospheric models and meteorological analyses that do not carry blowing-snow parameterizations are affected by a systematic dry bias; ( 2) while snowpack modelling with a parameterization of surface-snow erosion by wind can reproduce the variability of snow accumulation and ablation, ignoring the high levels of atmospheric-moisture content associated with blowing snow results in overestimating surface sublimation, affecting the energy budget of the snowpack; ( 3) the well-known profile method of calculating turbulent moisture fluxes is not applicable when blowing snow occurs, because moisture gradients are weak due to blowing-snow sublimation, and the impact of measurement uncertainties are strongly amplified in the case of strong winds.
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Dates et versions

hal-01143783 , version 1 (21-04-2015)

Identifiants

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Hélène Barral, Christophe Genthon, A. Trouvilliez, Christophe Brun, C. Amory. Blowing snow in coastal Adelie Land, Antarctica: three atmospheric-moisture issues. The Cryosphere, 2014, 8 (5), pp.1905-1919. ⟨10.5194/tc-8-1905-2014⟩. ⟨hal-01143783⟩
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