Reference : Sensitivity of Greenland Ice Sheet surface mass balance to surface albedo parameterizati...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/125388
Sensitivity of Greenland Ice Sheet surface mass balance to surface albedo parameterization: a study with a regional climate model
English
van Angelen, J. [> >]
Lenaerts, J. [> >]
Lhermitte, S. [> >]
Fettweis, Xavier mailto [Université de Liège - ULg > Département de géographie > Topoclimatologie >]
Kuipers Munneke, P. [> >]
van den Broeke, M. [> >]
van Meijgaard, E. [> >]
23-Oct-2012
Cryosphere
Copernicus
6
1175-1186
Yes
International
1994-0416
1994-0424
Katlenberg-Lindau
Germany
[en] We present a sensitivity study of the surface mass balance (SMB) of the Greenland Ice Sheet, as modeled using a regional atmospheric climate model, to various parameter settings in the albedo scheme. The snow albedo scheme uses grain size as a prognostic variable and further depends on cloud cover, solar zenith angle and black carbon concentration. For the control experiment the overestimation of absorbed shortwave radiation (+6%) at the K-transect (west Greenland) for the period 2004–2009 is considerably reduced compared to the previous density-dependent albedo scheme (+22%). To simulate realistic snow albedo values, a small concentration of black carbon is needed, which has strongest impact on melt in the accumulation area. A background ice albedo field derived from MODIS imagery improves the agreement between the modeled and observed SMB gradient along the K-transect. The effect of enhanced meltwater retention and refreezing is a decrease of the albedo due to an increase in snow grain size. As a secondary effect of refreezing the snowpack is heated, enhancing melt and further lowering the albedo. Especially in a warmer climate this process is important, since it reduces the refreezing potential of the firn layer that covers the Greenland Ice Sheet.
Researchers
http://hdl.handle.net/2268/125388
10.5194/tc-6-1175-2012
http://www.the-cryosphere.net/6/1175/2012/tc-6-1175-2012.html

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