Task: Class Definition Understanding (ontology: Earth_Environment/SWEET)

Which of the following definitions best describes 'radiation fog'?

A. A name applied to a wet sea fog or very fine drizzle that drifts in from the sea in coastal districts of eastern Scotland and northeastern England. It occurs most frequently in summer.
B. A common type of fog, produced over a land area when radiational cooling reduces the air temperature to or below its dewpoint.
C. A type of fog caused by the advection of moist air over a cold surface, and the consequent cooling of that air to below its dewpoint.
D. Fog associated with frontal zones and frontal passages. It is usually divided into three types: warm-front prefrontal fog; cold-front post-the concept; and frontal-passage fog. The first two types are a result of rain falling into cold stable air and raising the dewpoint temperature. Frontal-passage fog can result from the ?mixing of warm and cold air masses in the frontal zone? or by ?sudden cooling of air over moist ground.?

Answer: A common type of fog, produced over a land area when radiational cooling reduces the air temperature to or below its dewpoint.