Chapters%201%262%20-%20Ozone-2

Chapters%201%262%20-%20Ozone-2 - A region of the atmosphere...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
A region of the atmosphere that is called "Earth's natural sunscreen"
Background image of page 1

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

View Full DocumentRight Arrow Icon
Ozone Layer A region of the atmosphere that is called "Earth's natural sunscreen" Dobson unit is equivalent to a 0.01 mm (0.001 cm) thickness of pure ozone at the density it would possess if it were brought to ground-level (1 atm) pressure and 0 o C temperature. Ozone at temperate latitudes amounts to about 350 DU; tropics 250 DU, subpolar regions 450 DU
Background image of page 2
Antarctic Ozone Hole Ozone each October (September to November; spring) gradually falling, with precipitous declines beginning in the late 1970s; lasts for several months Mid-1980s loss of more than 50%; size of the American continent Occurs as a result of chlorine pollution Ozone depletion is also occurring in temperate areas rate of about 3%/year in the 80s but no net loss in the 90s
Background image of page 3

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

View Full DocumentRight Arrow Icon
FIGURE 1-1 The seasonal dependence of total over -head ozone (black curve) and the January 1979–March 1994 depletions in ozone (green curve) for the 35–60°N region. [Source: Redrawn from R. D. Bojkov, L. Bishop, and V. E. Fioletov, “Total Ozone Trends from Quality-Controlled Ground-Based Data,” Journal of Geophysi-cal Research 100 (1995): 25867–25876.]
Background image of page 4
FIGURE 1-2 Minimum concentration of total overhead ozone above Antarctica each spring in recent years. [Source: NASA website http://toms.gsfc.nasa.gov/ multi/min_ozone.jpg]
Background image of page 5

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

View Full DocumentRight Arrow Icon
FIGURE 1-3 The variation with year of the size of the Antarctic ozone hole, measured as the average area within the 220-DU contour line. [Source: NASA website http://toms.gsfc.nasa.gov/ multi/oz_hole_area.jpg]
Background image of page 6
Env. Chemistry, Baird & Cann
Background image of page 7

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

View Full DocumentRight Arrow Icon
The Atmosphere is Divided Into Several Regions Troposphere, ground level to about 15 kilometers altitude - main components (ignoring the normally ever-present but variable water vapor) of an unpolluted version of the Earth's atmosphere are diatomic nitrogen (N 2 , about 78% of the molecules), diatomic oxygen (O 2 , about 21%), argon (Ar, about 1%), and carbon dioxide (CO2, presently about 0.04%).
Background image of page 8
Stratosphere The portion of the atmosphere from approximately 15 to 50 kilometers (i.e. 9 - 30 miles) altitude that lies just above the troposphere. ozone layer , which is found in the bottom half of the stratosphere -Figure 1-5. The bottom of the stratosphere occurs where the temperature first stops decreasing with height and begins to increase, and the top of the stratosphere is the altitude where the temperature stops increasing with height and begins to decrease
Background image of page 9

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

View Full DocumentRight Arrow Icon
Env. Chemistry, Baird & Cann
Background image of page 10
Environmental Concentration Units For Atmospheric Gases Molecules per cubic centimeter: -Figure 1-5a Absolute concentrations: partial pressure -atmospheres or kiloPascals or bars Relative concentrations:
Background image of page 11

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

View Full DocumentRight Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/29/2010 for the course ECON 100A taught by Professor Smith during the Spring '08 term at Alabama.

Page1 / 72

Chapters%201%262%20-%20Ozone-2 - A region of the atmosphere...

This preview shows document pages 1 - 12. Sign up to view the full document.

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