L1 /
4
CH3041
EVAPORATION
• A significant amount of the solar E which strikes the surface is used to vaporise water which carries away latent heat from the surface
(this is slowly released as heat as the H2O
condenses). H2O has a high
latent
heat of vaporistion LEvap
= E to vaporise 1 mol H2O
LEvap = 2 kJ / g
heat of vaporistion LEvap
= E to vaporise 1 mol H2O
LEvap = 2 kJ / g
• Sensible
heat is due to
the kinetic energy of
heated air molecules.
the kinetic energy of
heated air molecules.
• In conjunction with the
differential Esolar received
at different latitudes this
creates the convection which moves the air masses.
differential Esolar received
at different latitudes this
creates the convection which moves the air masses.
High
latitude > 60o
Mid Latitude 30 –60o
Low
latitude 0 – 30o
