[Terrapreta] Methane dwell times

[Sean K. Barry]

Hi Robert,

Look at this page: http://en.wikipedia.org/wiki/Methane<http://en.wikipedia.org/wiki/Methane>

Right in near the top of the page, center screen.  It says ...

"Methane in the atmosphere has a half life of seven years, meaning that every seven years, half of the methane present is converted to carbon dioxide and water."

Look also at: http://en.wikipedia.org/wiki/Greenhouse_gases<http://en.wikipedia.org/wiki/Greenhouse_gases>

Both these pages can give you a firm understanding of Methane and GHG issues.

Regards,

SKB
  ----- Original Message ----- 
  From: Robert Klein<mailto:arclein at yahoo.com> 
  To: terra preta<mailto:terrapreta at bioenergylists.org> 
  Sent: Thursday, August 30, 2007 2:12 PM
  Subject: [Terrapreta] Methane dwell times


  While we are all on the subject of methane, does
  anyone know of any studies done on atmospheric methane
  content in the middle of the Sahara Desert  were no
  local source is likely and any such methane will have
  traveled for several days from the nearest margin that
  could also be measured.

  This should give us a reasonable half life for
  atmospheric methane in general.  It may also establish
  a level that reflects the irreducible minimum for
  methane concentration as we essentially have for water
  vapor.  Though I can not help but think that methane
  levels must be continuously maintained, even in the
  stratosphere.

  arclein


         
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