class4_w08

class4_w08 - NOx and SO2 are the most serious pollutants...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
NO x and SO 2 are the most serious pollutants photochemical processes, acid depositions: HNO 3 ; H 2 SO 4 (secondary pollutants) CH 4 and N 2 O are also important greenhouse gases Particulates and aerosols also have major climate effects
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Physical Characteristics of the Atmosphere Primary concern is with troposphere and stratosphere O layer is very thin – humans emit over 10x mol CO /year than total mol O
Background image of page 2
Pressure (density) decreases as an exponential function of altitude: P h = P o e -Mgh/RT ; M = molar mass g = gravitational acceleration = 980 cm/s 2 RT/Mg = scale height – increase in altitude by which P drops by e -1 (~39%) = 8 km. Balance of sedimentation and translational kinetic motion of the molecules Atmosphere is 10 -6 of total earth mass; 99% of mass below 30 km Atmosphere: pressure variations
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Temperature increase from 18-50 km arises from stratospheric production of ozone ( O + O 2 + M O 3 + M + heat ). Temperature decrease with altitude arises from expansion as the air rises and does work on its surroundings. Water condenses as the air rises; heat of vaporization released mitigates the temperature decrease. In the tropopause layer the water actually
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/06/2008 for the course CHEM 123 taught by Professor Perona during the Winter '08 term at UCSB.

Page1 / 14

class4_w08 - NOx and SO2 are the most serious pollutants...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online