ozone layer depletion

Topics: Atmosphere, Ozone depletion, Greenhouse gas Pages: 54 (8948 words) Published: January 17, 2014


Understanding the Linkages
Angus Fergusson
Meteorological Service of Canada

Published by authority of the Minister of the Environment
Copyright © Minister of Public Works and Government Services Canada, 2001 Catalogue No. EN56-168/2001E
ISBN: 0-662-30692-9
Également disponible en français
Author: Angus Fergusson (Environment Canada)
Editing: David Francis ( Lanark House Communications)
David Wardle / Jim Kerr (Environment Canada)
Contributing Authors: Bruce McArthur (Environment Canada): Bratt Lake Observatory David Tarasick (Environment Canada): Canadian Middle Atmosphere Model Tom McElroy (Environment Canada): MANTRA Project

Special thanks for comments to: Vitali Fioletov (Environment Canada) Hans Fast (Environment Canada)
Pictures: Angus Fergusson (Environment Canada)
John Bird (Environment Canada)

Brent Colpitts
Ray Jackson
Layout and Design: BTT Communications

Additional copies may be obtained, free of charge, from:
Angus Fergusson
Science Assessment and Integration Branch
Meteorological Service of Canada
4905 Dufferin Street
Downsview, Ontario
M3H 5T4
E-mail: Angus.Fergusson@ec.gc.ca

Table of Contents





The Atmosphere and its Radiative Effects


The Dynamics of the Atmosphere


The Chemistry of the Atmosphere


Biogeochemical Linkages:
The Impact of Increased UV Radiation


Canadian Research and Monitoring


Implications for Policy


The Research Agenda


Making Connections




Figure 1. Compared to the earth itself, the earth’s
atmosphere as seen from space looks remarkably thin,
much like the skin on an apple. In this photograph, the
two lowest layers of the atmosphere, the troposphere and
the stratosphere, are clearly visible. The stratosphere is
home to the ozone layer that protects life on earth from
intense ultraviolet radiation. The troposphere is the layer
where most weather activity takes place. The top of the
thundercloud has flattened out at the tropopause, the
boundary between the two layers. Interactions between
the troposphere and stratosphere provide a number of
important connections between ozone depletion and
climate change.

Figure 1

Source: NASA



zone depletion and climate
change have usually been
thought of as environmental
issues with little in common
other than their global scope and
the major role played in each by
CFCs and other halocarbons.
With increased understanding of
these issues, however, has come a
growing recognition that a number of very important linkages exist between them. These linkages will have some bearing on how each of these problems
and the atmosphere as a whole
evolve in the future.
Some of the most important of
these linkages involve the way
that ozone-depleting substances
and greenhouse gases alter radiation processes in the atmosphere so as to enhance both global
warming and stratospheric ozone
depletion.These changes result
in a warming of the troposphere
(the bottom 8–16 km of the
atmosphere) and a cooling of the
stratosphere (the layer above that
extends to an altitude of about
50 km and contains the ozone
layer). Stratospheric cooling
creates a more favourable environment for the formation of polar stratospheric clouds (PSCs),

which are a key factor in the
development of polar ozone
Enhancement of the greenhouse effect may also be causing
changes in circulation patterns in
the troposphere that are, in turn,
altering the circulation in the
stratosphere. It is suspected that
these changes are increasing the
cooling forces acting on the
stratosphere over the poles and
are thus making the formation of
ozone holes more likely.There is
evidence as well that changes in
the stratospheric circulation may
be altering weather patterns in
the troposphere....

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