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SUMMARY:Cosmic rays and climate
DTSTART;VALUE=DATE-TIME:20090604T143000Z
DTEND;VALUE=DATE-TIME:20090604T160000Z
DTSTAMP;VALUE=DATE-TIME:20130524T044904Z
UID:indico-event-52576@cern.ch
DESCRIPTION:The current understanding of climate change in the industrial 
 age is that it is predominantly caused by anthropogenic greenhouse gases\,
  with relatively small natural contributions due to solar irradiance and v
 olcanoes. However\, palaeoclimatic reconstructions show that the climate h
 as frequently varied on 100-year time scales during the Holocene (last 10 
 kyr) by amounts comparable to the present warming - and yet the mechanism 
 or mechanisms are not understood. Some of these reconstructions show clear
  associations with solar variability\, which is recorded in the light radi
 o-isotope archives that measure past variations of cosmic ray intensity. H
 owever\, despite the increasing evidence of its importance\, solar-climate
  variability is likely to remain controversial until a physical mechanism 
 is established.  \nEstimated changes of solar irradiance on these time sca
 les appear to be too small to account for the climate observations. This r
 aises the question of whether cosmic rays may directly affect the climate\
 , providing an effective indirect solar forcing mechanism. Indeed recent s
 atellite observations - although disputed - suggest that cosmic rays may a
 ffect clouds. This talk presents an overview of the palaeoclimatic evidenc
 e for solar/cosmic ray forcing of the climate\, and reviews the possible p
 hysical mechanisms. These will be investigated in the CLOUD experiment whi
 ch begins to take data at the CERN PS later this year.\n\nhttp://indico.ce
 rn.ch/conferenceDisplay.py?confId=52576
LOCATION:CERN Main Auditorium**
URL:http://indico.cern.ch/conferenceDisplay.py?confId=52576
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