Fog in Tucson
Fog is a climate condition characterized by presence of water vapor in air layer close to the surface of the earth reducing visibility to a distance of about 1000 meters or less. It is common in some areas more than others because of the need for creation of special conditions. These conditions further determine the type of fog to be created in a specific area.
The purpose of this paper is to therefore explain conditions that are necessary for formation of fog and to distinguish different types of fog observed in Tucson.
When air humidity is increased to 100 percent, fog can be formed. This can also be accomplished by introducing water vapor into the air and cooling the air hence, making it saturated. Fog in Tucson occurs in rare cases because of dry air in the region. However, radiation fog is common as it forms when air layer, close to the ground cools thus, emitting an infrared radiation.
Cold ground on the other hand will also cool thin layer of moist layer in the air that comes into contact with thus creating radiation fog. Evaporation fog is also experienced in Tucson and it occurs when cold and warm moist air comes into contact. As a result of the contact, the fog is commonly referred to as mixing fog. It also occurs in cold mornings when evaporating water from warm pools increases saturation of cold air over it.
In Tucson, mixing fog can be experienced in cold morning when warm water vapor that is produced during plant material combustion saturates the air forming a cloud. Mixing fog is also warmer that the surrounding air and as a result, it floats upwards. This kind of visual appearance therefore, clearly distinguishes mixing fog from radiation fog that often appears as a thin cloud layer formed at the grounds level.
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