Atmospheric Moisture

At the crest of the mountains at 3000 m it is now 9

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Unformatted text preview: point is reached at 2000 m. When that air reaches 2000 m, it is 15° and as it continues to rise it cools at the WALR. At the crest of the mountains, at 3000 m, it is now 9°. Now the air descends the other side of the range. Because it is going down, it is warming and descending air always changes at the DALR. When it reaches the valley floor on the other side, it has warmed to 24°C. So, on the windward side, the air cools at the DARL until it reaches the dew point, then switches to the WALR. After it passes the crest, it goes down the other side (the lee side), warming at the DALR. Because of this pattern, we find that the windward side tends to get lots of rain and the lee side gets much less. Downwind of such mountain ranges, it tends to be dry because the air has lost much of its moisture crossing the mountains. The term for this is the rainshadow effect, and it explains why we are pretty dry here on the downwind side of the Rocky Mountains. Atmospheric Moisture:8 (-6°C/1000 m) (1000 m) = -6°C 9° 3000 m (10°C/1000 m) (1500 m) = 15°C 15°C - 6°C = 9°C 9°C + 15°C = 24°C WALR DALR 15° (-10°C/1000 m) (1500 m) = -15°C 30°C - 15°C = 15°C DALR 30° 500 m 2000 m 24° 1500 m...
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This document was uploaded on 10/27/2011 for the course GEOG 1401 at Texas Tech.

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