Marine layer
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A marine layer is a cool, moist, foggy layer of air that can be several hundred feet to as much as two thousand feet thick associated with offshore weather patterns.
How a marine layer develops
Cold ocean water, such as the off the Pacific Coast in Southern California, cool the air just above it, which creates the marine layer.
Warmer air above that layer acts like a seal, and keeps the air below it from mixing and dispersing.
In the case of Southern California, a steady west wind often brings the marine layer ashore overnight, blanketing coastal communities in a cool, thick fog. This can last until midday when the heat of the sun is frequently strong enough to break the inversion layer and dissipate the effects. In California, the marine layer is most common from spring through to fall.
Drizzle or light rain can also be associated with a particularly wet marine layer.
Effect on pollution
The inversion that caps the marine layer also traps pollutants in cities such as Los Angeles which exacerbates the development of smog.
See also
See June Gloom
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