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Upper Atmosphere
basics
1. Understanding the stratosphere
2. Ozone hole
- ozone formation
- ozone hole & CFC's
* Worksheet 1
* Worksheet 2
Ozzy Ozone
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stratosphere

Upper Atmosphere

Basics


2. Ozone hole

Worksheet 1
Ozone: The Chapman-Cycle

 

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Ozone is created and destroyed in the stratosphere.  The English mathematician and geophysisist, Sidney Chapman, investigated and described this cycle. Because of his work, the cycle is called the "Chapman-Cycle".

The flash animation below shows the Chapman-Cycle and all the important steps in it.

Symbols:

molecule and particle symbols

oxygen atom

molecule and particle symbols oxygen molecule
molecule and particle symbols ozone
molecule and particle symbols photons of high, but different, energies (ultra-violet radiation)
molecule and particle symbols heavy weight particles with different temperatures
 
1. © 2003 Seesing, Tausch, Universitšt-Duisburg-Essen, Duisburg

 

 
ozone photolysis in steps

2. © 2003 Seesing, Tausch, Universitšt-Duisburg-Essen, Duisburg

  • T1

Add the missing words to the text. The missing words are:

ozone molecule ; ozone molecules; cracking of ozone; oxygen atom ; oxygen atom; oxygen atoms; oxygen atoms; oxygen molecule ; oxygen molecule; oxygen molecule; oxygen molecules; UV-light ; UV-light; energy; energy; wavelength

  1. High-energy (short wave) UV-light can crack (breakdown)  ________________________ into ________________________.
     
  2. If an ________________________, an ________________________ and a heavy weight particle impact in a "triple collision" an ________________________ is formed. The heavy weight particle can be a dust particle, or another big gas molecule such as nitrogen gas. 
     
  3. The heavy weight particle absorbs the  ________________________, which becomes free during ozone formation. It delivers the ________________________slowly to the environment afterwards.
     
  4.  ________________________ can be broken down similarly by _______________________. The ________________________needed by this do not need to have as much energy as they do to breakdown oxygen molecules into oxygen atoms. The ________________________can be larger. The products of this ______________________ are an ______________________ and an_______________________.
     
  5.  When two ________________________collide, an ________________________is formed.

 

 

  • T2

Explain briefly which form of energy in the stratosphere is converted into warmth by the Chapman-Cycle.

 

 

 

Download

animation
3. Animation: ChapmanS.swf (59kB)
Please click with the right mouse button on the image and choose "save link target as..." to download the animation.

 

About this page:
authors: M. Seesing, M. Tausch - Universitšt Duisburg-Essen, Duisburg, Germany
last update: 2004-05-13

 

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last updated 02.03.2006 18:24:24 | © ESPERE-ENC 2003 - 2013