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Lecture

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Department
Geography
Course
GEOG 1120
Professor
Tang
Semester
Fall

Description
Geog Chapter 7 Lecture/Lab October 30, 2013 6:03 PM FOG - Fog is clouds in direct contact with the ground - Less than 1 km is visible at a distance - Calm, not a lot of wind - Very stagnant air movement 1. By cooling: a) Advection fog Example: Cold ocean current brings cold air across coast of Vancouver to a pool of warm air coming towards North America. By ADVECTION, warm air is moving. Howeverit is in direct contact with cold water and temperaturebegins to drop by process of cooling. Reaches dew point temperature,becomessaturated, becomesfog and develops right along our coastline. b) Radiation fog Example: At night, no clouds, the best setting. Under cloudless condition, Earth is losing heat to outer space fast, and infrared radiation by Earth goes up. Overnight, heat alters fast and ground becomesreally cold really fast and air directly above cools at fast rate too. Processof cooling because of heat loss. 2. Adding water vapour Example: Landmass on left side, body of water on right side. On land mass, pool of cold air. Cold air moving from left to right (towards body of water, in direct contact). Cold air is now sitting on body of water and water evaporatesupwards into cold air, adding water vapour to the air. Even very cold air could make it saturated, so fog appears directly on surface of water. Known as EVAPORATION FOG (adding water vapour to the air). - Only these 3 types needed to know. ~ Air Masses 1. Temperaturecharacteristics of an air mass. - Arctic (A): pretty cold - Polar (P): also very cold - Tropical (T): very warm
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