The role of albedo and accumulation in the 2010 melting record in Greenland

Analyses of remote sensing data, surface observations and output from a regional atmosphere model point to new records in 2010 for surface melt and albedo, runoff, the number of days when bare ice is exposed and surface mass balance of the Greenland ice sheet, especially over its west and southwest regions. Early melt onset in spring, triggered by above-normal near-surface air temperatures, contributed to accelerated snowpack metamorphism and premature bare ice exposure, rapidly reducing the surface albedo. Warm conditions persisted through summer, with the positive albedo feedback mechanism being a major contributor to large negative surface mass balance anomalies. Summer snowfall was below average. This helped to maintain low albedo through the 2010 melting season, which also lasted longer than usual.

[1]  Alan H. Strahler,et al.  An algorithm for the retrieval of albedo from space using semiempirical BRDF models , 2000, IEEE Trans. Geosci. Remote. Sens..

[2]  Marco Tedesco,et al.  Snowmelt detection over the Greenland ice sheet from SSM/I brightness temperature daily variations , 2007 .

[3]  X. Fettweis,et al.  Evaluation of a high-resolution regional climate simulation over Greenland , 2005 .

[4]  X. Fettweis,et al.  Greenland surface mass balance simulated by a regional climate model and comparison with satellite-derived data in 1990–1991 , 2005 .

[5]  X. Fettweis.  Reconstruction of the 1979–2006 Greenland ice sheet surface mass balance using the regional climate model MAR , 2007 .

[6]  J. Oerlemans,et al.  Surface mass-balance observations and automatic weather station data along a transect near Kangerlussuaq, West Greenland , 2005, Annals of Glaciology.

[7]  E. Brun,et al.  A numerical model to simulate snow-cover stratigraphy for operational avalanche forecasting , 1992, Journal of Glaciology.

[8]  John Cappelen,et al.  DMI Monthly Climate Data Collection 1768-2008, Denmark, The Faroe Islands and Greenland , 2005 .

[9]  C. Veen,et al.  Partitioning of melt energy and meltwater fluxes in the ablation zone of the west Greenland ice sheet , 2008 .

[10]  Xavier Fettweis,et al.  The 1958–2009 Greenland ice sheet surface melt and the mid-tropospheric atmospheric circulation , 2009 .

[11]  Crystal B. Schaaf,et al.  Accuracy assessment of the MODIS 16-day albedo product for snow: comparisons with Greenland in situ measurements , 2005 .

[12]  C. Schaaf,et al.  Evaluation of surface and near-surface melt characteristics on the Greenland ice sheet using MODIS and QuikSCAT data , 2009 .

[13]  R. Kwok,et al.  Detection of snowmelt regions on the Greenland ice sheet using diurnal backscatter change , 2001, Journal of Glaciology.

[14]  K. Steffen,et al.  Climate of the Greenland ice sheet using a high-resolution climate model – Part 1: Evaluation , 2010 .

[15]  X. Fettweis,et al.  Greenland surface mass balance Greenland surface mass balance simulated by a regional climate model and simulated by a regional climate model and comparison with satellite derived data in 1990-1991. comparison with satellite derived data in 1990-1991. , 2007 .

[16]  X. Fettweis,et al.  Evaluation of a high-resolution regional climate simulation over Greenland , 2005 .

[17]  K. Steffen,et al.  Sublimation on the Greenland Ice Sheet from automated weather station observations , 2001 .

[18]  Edward Hanna,et al.  Increased Runoff from Melt from the Greenland Ice Sheet: A Response to Global Warming , 2008 .

[19]  Konrad Steffen,et al.  Snowmelt on the Greenland Ice Sheet as Derived from Passive Microwave Satellite Data , 1997 .

[20]  X. Fettweis,et al.  Melting trends over the Greenland ice sheet (1958–2009) from spaceborne microwave data and regional climate models , 2010 .

[21]  Thomas L. Mote,et al.  Greenland surface melt trends 1973–2007: Evidence of a large increase in 2007 , 2007 .