Weather Vs. Climate. Weather is the set of environmental conditions that occur day to day or even minute to minute Climate is the set of environmental conditions that is expected to occur for a given area over any given year. The Earth’s Energy Balance.
An object or material that absorbs energy and becomes warmer is called a heat sink
The heat capacity of an object is the measure of how much heat a substance requires to raise its temperature or how much energy it releases as it cools
Heat capacity is measured in joules of energy per kilogram degree J/(Kg ºC).
Amount of energy (J) x (1-albedo)
10 000 J x (1-0.4)
= 6 000 J
Now calculate the amount of energy absorbed by a parking lot with an albedo of 0.02 and receiving 8000 J/m2
Q = m c t
REMEMBER GRASP PROBLEM SOLVING!
1. How much energy is required to bring 1kg (1L) of water from 20 C to a boil? Note the Specific Heat Capacity of water is 4186 J/Kg C
2. How hot will a 50Kg rock in the dessert get if it receives 592.5 KJ of energy from the sun (C= 790J/Kg C)
Assuming the asphalt in the a previous question
had a mass of 84kg, how much would you expect
the surface temperature to rise?
The passive solar panels connected to a backyard swimming pool have and Albedo of 0.05. The panels will receive 40000 KJ of energy from the sun per hour on an average sunny day. Assuming no heat loss from the pool water to the atmosphere how much might the temperature of the pool be raised in a typical afternoon (4 hours). The volume of an average sized swimming pool is 36 m3 (36000 Kg).