Lesson 303 Types Of Evolution Of Fog

Question 1

List the three factors that control the evolution of fog.

CAM

Answer 1

Cooling of the air
Addition of water vapour
Mixing

Question 2

List the six types of fog

RAUPSI

Answer 2

Radiation
Advection 
Upslope 
Pre-frontal
Steam
Ice fog

Question 3

What are the favoured conditions for the formation of radiation fog? CLHC

Answer 3

Clear night
Light wind speed (3-5 KT)
High relative humidity
Condensation nuclei

Question 4

What are the favoured conditions for the formation of advection fog? MMHC

Answer 4

Moist air over a cold surface
Moderate wind speed (13-17 KT)
High relative humidity
Condensation nuclei

Question 5

What are the favoured conditions for the formation of upslope fog?
MACH

Answer 5

Air forced up a slope (orographic lift)
Moderate wind speed (13-17 KT)
High relative humidity
Condensation nuclei

Question 6

What are the requirements for the formation of pre-frontal (warm rain) fog?
WFHC

Answer 6

Warm air over cold air
Frontal precipitation
High relative humidity
Condensation nuclei

Question 7

What are the conditions favourable for the formation of steam fog and Arctic sea smoke?
CHC

Answer 7

Cold air above warmer water
High relative humidity
Condensation nuclei

Question 8

Ice fog is a __________ phenomenon which occurs at very cold temperatures. It is formed of ice crystals and is caused by the addition of water vapour to the air through _________________.

Answer 8

Man-made

Fuel combustion

Question 9

List the two factors that control the dissipation of fog.

HD

Answer 9

Heating of the air

Decrease of water vapour

Question 10

The dissipation of fog by heating can by the following:

SAAT

Answer 10

Solar radiation
Advection over a warm surface
Adiabatic heating
Turbulent mixing

Question 11

The dissipation of fog by decreasing water vapour can be carried out by:
TC

Answer 11

Turbulent mixing with dryer air above

Condensation of water (dew) or sublimation (hoar frost).