Ozone Depletion

The depletion of the stratospheric ozone layer via CFCs and and global warming due to CO2 deposition into the atmosphere are:

TWO SEPARATE PROBLEMS !!!!!
TWO SEPARATE PROBLEMS !!!!!
TWO SEPARATE PROBLEMS !!!!!
TWO SEPARATE PROBLEMS !!!!!
TWO SEPARATE PROBLEMS !!!!!

Let's end the confusion now and remember this for the second exam.

Global Warming: This is caused by the build up of CO2 and CH4 in the lower atmosphere of the earth. These gases increase the infrared absorption potential of the lower atomsphere and hence increases its ability to retain heat.

Ozone Depletion: This occurs in the stratosphere at a height of about 15 km above the surface. The depletion of Ozone means that more UV radiation from the sun reaches the surface. This does not make the surface hotter, as only a small percentage of sunlight is in the form of Ultraviolet radiation.

The ozone layer itself does not reduce the overall amount of visible radiation which reaches the surface and does most of the heating. Hence removal of the ozone layer does not make the earth substantially warmer.

The Current Status of the Ozone Problem (as of 10/96):

Ozone Depeletion
Oct 30, 1996 Hole size

Long Term Evolution:

Latest Results (9/1/96 - 10/14/96)

Overview:

1995 Hole data:

Why do we see the hole in the Antarctic Spring?

Expectations for this Spring (i.e. right now)

Where are we Now?

Internet Resources Relevant to the Ozone Problem:

Previous Lecture