CHM 111 Lecture Notes - Lecture 1: System Model, Ozone Depletion, Dobson Unit
21 Apr 2016
School
Department
Course
Professor
Document Summary
Troposphere: region directly above the surface of the earth. Stratospheric ozone plays a vital role in protecting the earth"s surface from damaging solar radiation. In the 1970"s, it was revealed that certain chemicals go into the upper atmosphere and destroy the protective ozone. Since then, there has been an effort to control and reverse ozone destruction. One dobson unit (du) is about one ozone molecule for every billion (1 x 10^9) molecules and atoms of air. Troposphere: there are 20-100) 3 molecules for each billion molecules and atoms of air: naaqs (table 1. 2); limit o3= . 075 ppm. How does it affect us: first documented there (antarctica, monitored/ observed in other locations across north america. Where you live and the season influences the amount of stratospheric ozone overhead and its protective effects. O oxygen atom (monoatomic, uncombined: very reactive. O2 oxygen molecule (diatomic molecule: colorless, odorless, tasteless, supports combustion. O3 ozone (triatomic molecule: more reactive than o2.
