6:15 PM - 7:30 PM
[ACG31-P01] An application of the mass balance model to the Hurlbut Ice Cap, northeastern Greenland
Keywords:Greenland, mass balance, ice cap, climate change
We estimated surface mass balance of Hurlbut Ice Cap in northern Greenland by the mass balance model of Hock (1999). The model takes temperature index method. The model shows spatial variation of surface mass balance for the ice cap. The 100m - gridded DEM and surface condition of the ice cap as input of the model were derived from modified ALOS (Advanced Land Observing Satellite) data. The climate data as input of the model was global radiation, air temperature and precipitation at Thule climate station (77.2N, 68.4W), which is one of the long-term running climate stations in Greenland and situates about 100 km south to the Hurlbut ice cap.
The result of the calculation is dependent on the tuning factors for both accumulation and ablation. The result was compared with the change of the surface height by Saito et al (2014). The air temperature at the Thule was increasing after 1990, and this is one of the reasons that mass balance of Hurlbut ice cap was negative.