AOSC200Lect27

AOSC200Lect27 - AOSC 200 Lesson 27 A Typical Day in a...

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Unformatted text preview: AOSC 200 Lesson 27 A Typical Day in a Pollution Episode A common severe pollution weather pattern occurs when high pressure is centered just west of the Mid Atlantic region. Circulation around the high pressure center moves pollution from points west into the mid-Atlantic. H Temperature inversions produce very stable atmospheric conditions in which mixing is greatly reduced. There are two general types of inversions: nocturnal (radiative) inversions at the ground and subsidence inversions aloft . Nocturnal inversions are the result of differential radiative properties of the Earths surface and the air above. The Earth is a much better absorber and radiator of energy than air; thus, in the late morning and afternoon hours the lower atmosphere is unstable. The opposite is true in the evening; a stable atmosphere with little vertical mixing prevails. Role of atmospheric stability Temperature Inversion Temperature Temperature Inversion Altitude Pollution trapped below inversion The Nocturnal Inversion On clear nights, a temperature inversion develops near the surface....
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AOSC200Lect27 - AOSC 200 Lesson 27 A Typical Day in a...

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