EESA09H3 Lecture : EESA09 WIND NOTES.docx
20 Nov 2012
School
Department
Course
Professor
Document Summary
Wind played key role in humanity s mythology and cultural development. Aeolus (greek god of wind), feng po po (chinese goddess of wind), haya-ji (japanese god of wind), nilch i (navajo holy wind, north american indian) In hindu and buddhist religions, wind viewed as the nature or state of a god. Wind is one of the five great elements. Wind also played metaphorical roles in literature. Earth s atmosphere existed for 4. 6 billion years. Composition of atmosphere not constant; variations in atmospheric constituents occurred due to three main controls: geological, biological, and anthropogenic. Geological control: early atmosphere composed of co2 and methane (ch4) due to volcanic emissions, life appeared 3. 8 billion years ago; anaerobic (not needing oxygen)flourished in this environment age of bacteria . Biological control: 2. 3 billion years ago, oxygen made appearance in atmosphere and stabilized at. 21% o2 optimal for aerobic life on earth; mars and venus are in static equil. with co2 and ch4.
