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SUMMARY:Evaluating CO2 as a primary driver of Mesozoic climate change - Gr
 egory D. Price\, School of Geography\, Earth and Environmental Sciences\, 
 University of Plymouth
DTSTART:20100309T110000Z
DTEND:20100309T120000Z
UID:TALK23377@talks.cam.ac.uk
CONTACT:Christian Franzke
DESCRIPTION:There is a general consensus that changes in atmospheric CO2 a
 re a major driver of global temperature and climate change. Many studies a
 lso agree that changes in atmospheric CO2  and temperature over geological
  time are also linked. However\, some estimates of past  temperatures\, de
 rived from the isotopic analyses of marine calcitic fossils and sedimentol
 ogical evidence for glacial episodes have been shown to have a limited cor
 relation with the estimates of past atmospheric CO2. This apparent mismatc
 h is particularly striking in the Mesozoic. The data point to rising CO2 l
 evels but falling temperatures. Hence this apparent negative relationship 
 between temperature and CO2 has been used as a central argument of those q
 uestioning the role of  greenhouse gases and  global warming. Utilising se
 dimentology\, geochemistry and faunal analyses together with isotopic data
  from a number of high latitude Arctic locations in western Siberia (the Y
 atria River and Taimyr Peninsula) and Svalbard (Festningen and Janusfjelle
 t) this presentation explores the evidence for glacial episodes within the
  Mesozoic.  This research also examines the isotopic composition of belemn
 ites and brachiopods in order to further constrain temperature through the
  Mesozoic. Our new data\, combined with the few published studies provide 
 a crucial test of the current Mesozoic data and provide critical input int
 o the debate on the main drivers of climate change. 
LOCATION:British Antarctic Survey\, Room 307
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