1. The case of Artesoncocha subbasin
Modelling surface mass balance and water discharge of tropical glaciers
The case of Artesoncocha subbasin

2. STUDY AREA

3. Retreatment in glaciers in Cordillera Blanca
1948
1986
1993
2001
2009
Source:Unidad de glaciología y recursos hídricos ANA Perú.

4. Retreatment in glaciers in Cordillera Blanca
Source:Unidad de glaciología y recursos hídricos ANA Perú.

5. Mass balance measurements

6. Energy balance model (Hock)
Distributed model.
Works in a subdiurnal or diurnal temporal resolution.
Solves the energy balance equation on the glacierized area (calculation per each grid of DTM).
Accounts for the spatial distribution of topographic shading.
Calculates individual energy balance components.
Calculates water discharge from the melting of three areas (firn, snow and ice) and the liquid precipitation.
ACCUMULATION:
Snow precipitation
ABLATION
Melting and Sublimation

7. RESULTS: MASS BALANCE Simulation period: March to September 2004
Validation period: March to September 2005

8. RESULTS: DISCHARGE Albedo Snow 0.9-0.92 Firn 0.6 Ice 0.3-0.32
E discharge period 2004
E discharge period 2005
0.72
0.63

9. RESULTS: NET RADIATION

10. RESULTS: TURBULENT FLUXES

11. CONCLUSIONS
The model of Hock is suitable for simulating mass balance and discharge in tropical glaciers for a daily resolution.
Short term periods should be simulatig to account major variability of albedo.
The values of sensible heat could be a hint of the effect of el Nino Phenomenum in the glacier in