Type and Evolution of Fog

Question 1

List the 3 factors that control the evolution of fog

Answer 1

1. Cooling of the air
2. Addition of water vapor
3. Mixing

Question 2

Radiation, Advection and upslope fog are formed by which types of cooling?

Answer 2

Radiation = radiation
Advection = advection
Upslope = adiabatic

Question 3

What type of wind is best for the formation of fog?

Answer 3

Light to moderate

Question 4

List the 6 types of fog

Answer 4

Radiation
Advection
Upslope
Pre-Frontal
Steam
Ice

Question 5

What is required for the formation of Radiation fog

Answer 5

Clear night
Lgt wind speed
High relative humidity
Condensation nuclei

Question 6

What is required for the formation of Advection fog

Answer 6

Moist air over cold surface
Moderate wind speed (13-17kts) + steady direction
High relative humidity
Condensation nuclei

Question 7

What is required for the formation of Upslope Fog

Answer 7

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

Question 8

What is required for the formation of Pre frontal fog

Answer 8

warm air over cold air
Frontal precip
High relative humidity
Condensation nuclei

Question 9

What is required for the formation of Steam fog

Answer 9

Cold air above warmer water
High relative humidity
Condensation nuclei

Question 10

What is required for the formation of Ice fog

Answer 10

Addition of water vapor to the air through fuel combustion. Man Made.

Question 11

List 2 factors that control the dissipation of fog

Answer 11

Heating of the air

Decrease of water vapor

Question 12

Heating of the air, in respect to the dissipation of fog, can take place via the following:

Answer 12

Solar radiation
Advection over a warm surface
Adiabatic heating
Turbulent mixing bringing warmer air down and lifting the saturated base layer

Question 13

A decrease in the amount of water vapor in the air, with respect to the dissipation of fog, can be carried out by:

Answer 13

Turbulent mixing of the fog with drier air above

Condensation of water vapor in the form of dew or sublimation as hoarfrost.