Rechercher
Le Labo en vidéo
Feb 24, 2012

La Topoclimatologie présentée par Michel ERPICUM : Vidéo

Pour nous contacter
an image
Université de Liège

Faculté des Sciences

Département de Géographie

Laboratoire de Climatologie et Topoclimatologie



Quartier Village 4

Clos Mercator 3, B11

4000 Liège

Belgique

Phone: +32 (0)4 366-52-21

The Laboratory » Team » Dr. Xavier FETTWEIS » 2015 melt season over Greenland simulated by MAR

2015 melt season over Greenland simulated by MAR

 The 2015 Greenland ice sheet SMB

simulated by MARv3.5.2 in real time

(automatic update every day at 23hTU with a delay of 3-4 days)

 

Fig 1: a) Time series of the cumulated Greenland ice sheet (GrIS) Surface Mass Balance (SMB) in GT simulated by the regional climate model MAR (version 3.5.2) forced by the NCEP-NCARv1 reanalysis since 1 Sep 2011 (in green), and 1 Sep 2014 (in red). The 1981-2010 mean simulated by MARv3.5.2 forced by NCEP-NCARv1 is also plotted in black. b) Same as a) but for the daily SMB in GT/day.  The absolute maximum/minimum SMB rate of each day is plotted in blue. c) Daily  mean GrIS near-surface temperature (TAS) simulated by MAR. The absolute maximum temperature of each day is plotted in blue. d) Time series of the North Atlantic Oscillation (NAO) index from Climate Prediction Center (CPC).

 


Fig 2a: Left) Cumulated SMB (in mm) from the 1 Sep 2014 to 31 Aug 2015. Right) Same as Left) but in respect to the 1981-2010 average from the 1 Sep to 31 Aug.

 

 


Fig 2b: Same as Fig 2a but for snowfall.

 

 

Fig 2c: Same as Fig 2a but for run-off.

 


Fig 3: Time series of a) the daily mean GrIS near-surface temperature (in °C), b) production of meltwater (in GT/day), c) melt extent (i.e. area where the daily meltwater production > 5 mmWE/day  in % of the ice sheet area), d) bare ice extent (i.e. area where the surface density is > 900 kg/m^3 in % of the ice sheet surface) and e) daily mean GrIS surface albedo simulated by MARv3.5.2 forced by NCEP-NCARv1 (1981-2015).

 
 
 
Fig 4: Left) Number of melt days ( (i.e. when the daily meltwater production > 5 mmWE/day) from the 1 May 2015 to 31 Aug 2015. Right) Same as Left) but in respect to the 1981-2010 average from 1 May to 31 Aug.
 
 
 
 
 










 
Fig 5: Left) Melt extent as derived from satellite data (Credit: NSIDC/Thomas Mote). Right) Same as a) but as simulated by MARv3.5.2 forced by NCEP-NCARv1. Daily meltwater production > 5 mmWE/day is used as melt threshold in MARv3.5.2.

 
 
Fig 6: Greenland bloking index (GBI) from NCEP-NCARv1 in red and from the Global Forecast System (GFS) based forcasting in dashed red. According to Hanna et al. (2013), the GBI is defined as the 500hPa geopotential height area averaged over 60-80°N, 280-340°E.  
 
 
 
Fig 7: Idem as Fig. 6 but for 700hPa temperature averaged over 60-80°N, 280-340°E.  
 
 
 
Fig 8: Left) Anomaly of surface albedo in respect to the 1981-2010 average over the dame day. Righ) Anomaly of the JJA mean surface albedo in respect to the 1981-2010 average from 1 Jun to 31 Aug. 
 
 
Fig 9: Same as Fig. 8 but for the nea-surface temperature (~3m) as simulated by MARv3.5.2 forced by NCEP-NCARv1. 

Interesting links:
 
 

(c) Xavier Fettweis, University of Liège (ULg), Belgium