JAN LENAERTS SNOWDRIFT CLIMATE Snowdrift climate of Greenland and Antarctica Jan Lenaerts Michiel van den Broeke Institute for Marine and Atmospheric Research,

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Presentation transcript:

JAN LENAERTS SNOWDRIFT CLIMATE Snowdrift climate of Greenland and Antarctica Jan Lenaerts Michiel van den Broeke Institute for Marine and Atmospheric Research, Utrecht University, Netherlands

JAN LENAERTS SNOWDRIFT CLIMATE Goals SMB = PR - RU - SU s - SU ds - ER ds DECEMBER 8, 20112AGU FALL MEETING 2011 INTRODUCTION surface mass balance Snowdrift sublimation Snowdrift erosion Regional climate model (RACMO2) + Snowdrift routine

JAN LENAERTS SNOWDRIFT CLIMATE DOMAIN GREENLANDANTARCTICA HORIZONT AL RESOLUTI ON 11 KM27 KM SIMULATIO N PERIOD LATERAL FORCING ERA-40 / ERA- INTERIM ERA-INTERIM Methodology 3AGU FALL MEETING 2011DECEMBER 8, 2011 METHODS

JAN LENAERTS SNOWDRIFT CLIMATE Spatial variability DECEMBER 8, 20114AGU FALL MEETING 2011 GrISAIS SU ds (Gt y -1 ) % of snowfall 36 % of ablation 874 ER ds (Gt y -1 ) 14 R ESULTS I

JAN LENAERTS SNOWDRIFT CLIMATE Interannual variability DECEMBER 8, 2011AGU FALL MEETING GREENLAND RESULTS II

JAN LENAERTS SNOWDRIFT CLIMATE Seasonal variability DECEMBER 8, 20116AGU FALL MEETING 2011 ANTARCTICA Summer: SU s and Melt // Winter: only SU ds Annual cycle in SU ds related to wind speed and surface snow conditions RESULTS III

JAN LENAERTS SNOWDRIFT CLIMATE Wind climate DECEMBER 8, 2011AGU FALL MEETING EVALUATION I 115 quality-controlled AWS stations

JAN LENAERTS SNOWDRIFT CLIMATE Wind climate (II) DECEMBER 8, 2011AGU FALL MEETING Entire ice sheet Without “rough” areas Horizontal resolution is crucial Extreme wind speeds are underestimated EVALUATION II

JAN LENAERTS SNOWDRIFT CLIMATE Wind climate (III) DECEMBER 8, 20119AGU FALL MEETING 2011 EVALUATION III

JAN LENAERTS SNOWDRIFT CLIMATE Snowdrift frequency DECEMBER 8, 2011AGU FALL MEETING Remote sensing (laser altimetry) In-situ stations EVALUATION IV Neumayer station, DML, East Antarctica

JAN LENAERTS SNOWDRIFT CLIMATE Snowdrift frequency (II) DECEMBER 8, 2011AGU FALL MEETING Palm et al., 2011 Laser altimetry + DEM -> depth of snowdrift layer Only strong events (> 20 m) and non-cloudy conditions EVALUATION V

JAN LENAERTS SNOWDRIFT CLIMATE Ablation areas DECEMBER 8, 2011AGU FALL MEETING EVALUATION VI Snowdrift (partly) explains presence and location of ablation areas

JAN LENAERTS SNOWDRIFT CLIMATE First attempt of describing snowdrift climate on large ice sheets Model evaluation focuses on wind speed climate and snowdrift frequency (in-situ and from space) Snowdrift sublimation is a significant contributor to the ice sheet SMB, mainly on Antarctica and in winter Snowdrift erosion is locally important Snowdrift increases near-surface humidity and impacts top snow layer characteristics Conclusions DECEMBER 8, 2011AGU FALL MEETING CONCLUSIONS