## EXERCISE 6 ENERGY BALANCE AND SNOWMELT RUNOFF CALCULATIONS

 Section Lab Assigned Due 012,013 Tuesday Tuesday, Oct 16 Friday, Oct 19 011 Thursday Thursday, Oct 18 Monday, Oct 22

• 40 possible points.
• WRITE THE QUESTION AT THE START OF EACH ANSWER.

### Energy Balance of a Snowpack

The timing and magnitude of snowmelt runoff is a direct function of the energy balance of the snowpack.

### Objective

The objective here is to understand the relative contributions that different energy fluxes contribute to snowmelt runoff.

1. Calculate the cold content of a snowpack given these conditions (5 points):
1. average snow temperature of -5 degrees C;
2. snow depth of 2 m; and
3. average snow density of 300 kg/m3.
2. Calculate the amount of heat added to a snowpack at 0 degrees C from 3.5 cm of rainfall with a temperature of 1 degree C (5 points).
3. Calculate the amount of water output that is produced from snowmelt on a day when the total net energy input is 150 cal/cm2 (5 points).
• incoming solar radiation is 620 W/m2;
• snow albedo is 0.92;
• snow temperature is -6 degrees C;
• incoming longwave radiation is 10% of the longwave emission from the snowpack; and
• emissivity of snow is 0.97.