Atmospheric Circulation

Atmospheric Circulation - A tmospher i c ci r cul ati on Cl...

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Unformatted text preview: A tmospher i c ci r cul ati on Cl i ck to edi t M aster subti tl e styl e M ovement of ai r To understand how ai r moves need to know… o o I s ai r a fl ui d??? A fl ui d i s somethi ng that can 1. 2. Fi l l up the space of a contai ner Fl ow o Accordi ng to thi s defi ni ti on, both l i qui ds and gases ar e fl ui ds Ther efor e, ai r i s a fl ui d! To understand how ai r behaves as a fl ui d, o o What happens to fl ui d when i t i s heated? D emonstr ati on of water (a l i qui d fl ui d) heated i n a beaker Potassi um per manganate sal t i s u sed to vi sual i ze convecti on cur r ents. http:/ / www.yenka.com/ fr eecontent/ attachment.acti on?qui ck=an Convecti on cur r ent – ci r cul ati on of water due to http:/ / www.yenka.com/ fr eecontent/ attachment.acti on?qui ck=t1 t emper atur e di ffer ences What happens to AI R (a gaseous fl ui d) w hen i t i s heated? A tmospher i c Ci r cul ati on o Near Equator • War m ai r r i ses, cool s and spl i ts to fl ow towar ds the pol es ~30°N& S si nks back to sur face Ai r moves al ong sur face back towar ds equator • • o Thi s occurs at hi gher l ati tudes as wel l Sur face Wi nds o L arge wi nds due i n par t to pr essur es caused by gl obal ci r cul ati on of ai r • H i gh Low H i gh L ow H i gh Low H i gh L eft si de of di agr am o Wi nds bl ow fr om h i gh to l ow pr essur e • Ri ght si de of Gl obal atmospher i c ci r cul ati on h ttp:/ / www.mhhe.com/ bi osci / genbi o/ tl w3/ eBr i dge/ Chp29/ an Rai n Shadows o o M ountai ns for ce humi d ai r to r i se Ai r cool s wi th al ti tude, cl ouds for m and pr eci pi tati on occurs (wi ndward si de) Dr y ai r mass moves down opposi te l eeward si de of mountai n o Cor i ol i s Effect o Ear th’s r otati on i nfl uences di r ecti on of wi nd • • Ear th r otates fr om West to East Defl ects wi nd fr om str ai ght-l i ne path o Cor i ol i s Effect • I nfl uence of the ear th’s r otati on on movement of ai r and fl ui ds Tur ns them R i ght i n the Nor ther n H emi spher e Tur ns them L eft i n the Souther n H emi spher e • • Cor i ol i s Effect o Vi sual i ze i t as a M er r y-Go-Round (see bel ow) ...
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This note was uploaded on 10/07/2010 for the course NSC 2004C taught by Professor Farell during the Fall '09 term at Dowling.

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