L1 /
3
CH3041
HYDROLOGIC CYCLE
• The hydrologic
cycle.
cycle.
•The lifetime of
water in the
atmosphere is
short: t = 10 days .
water in the
atmosphere is
short: t = 10 days .
• Transport is fast
and so the average
water molecule will
have travelled 1000 km before removal as either rain, hail or snow.
and so the average
water molecule will
have travelled 1000 km before removal as either rain, hail or snow.
• Evaporation and transpiration (plants) are
the main sources of H2O in the atmosphere.
the main sources of H2O in the atmosphere.
(N.B. L2/S9
CFC-12 t 110y)
Fluxes 106 km3 / y
