Precipitation causes a net latent heating of the e the heating rate, in J s1, ca

Question

Precipitation causes a net latent heating of the e the heating rate, in J s1, caused by a 1 mm per day drizzle rate for atmosphere. (a) C every 1 m2 of cloud area. How much would this heating rate change if, instead of drizzle, a slow snowfall rate of 1 mm per day (liquid-water equivalent depth) occurred? (b) Compare your result to the amount of net surface solar absorption (in J s1 for every 1 m2) in the mid- latitudes during winter (i.e. for a region typical of central PA): Look up a typical value and make sure to cite the source you used.

Explanation / Answer

Solution: - Rate of Heat is given by

Q/t = kA(T2-T1)/t

if it is snow fall the k value will be less than drizzlw water

for snow, heat rate is, Q/t = 0.10*1*DT/1*10^-3 ------------------(1)

for water, heat rate is, Q/t = 0.563*1*DT/1*10^-3 -----------------(2)

So, the ratio is = 0.177 m

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