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SUMMARY:Relationship between Greenhouse Gases and Global Temperature - Pro
 f Murry Salby (Macquarie University)
DTSTART:20130422T130000Z
DTEND:20130422T140000Z
UID:TALK42476@talks.cam.ac.uk
CONTACT:Dr Amanda Maycock
DESCRIPTION:Interpretations of climate revolve about changes of atmospheri
 c composition\, which involve an increase of greenhouse gases. Carbon diox
 ide and methane are each emitted by human activities\, as well as a host o
 f native processes.  Their relationship to global temperature is central t
 o understanding current climate and how it will evolve.\n\nAtmospheric com
 position and temperature are found to obey a clear two-pronged relationshi
 p in the proxy record from ice cores\, which represents ancient changes th
 at operate on time scales longer than several thousand years.  A similar r
 elationship is found to be obeyed in the observed record of actual atmosph
 eric measurements\, which represents modern changes that operate on time s
 cales shorter than a century.  Supporting analysis shows\nthat the two rel
 ationships are connected.  It reveals a common physical mechanism behind c
 hanges of composition in the two records.  The physics common to the recor
 ds provides unified insight into recorded changes of greenhouse gases\, th
 ose apparent in the proxy record of ancient composition as well as those a
 ctually observed during the 20th century.  The governing relationship is t
 hen compared against the relationship that prevails in climate models\, in
  their simulation of future changes.
LOCATION:Pfizer Theatre\, Department of Chemistry
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