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SUMMARY:Temperature-dependent carbon cycling in the Eocene greenhouse - Pr
 ofessor Paul Pearson\, Cardiff University
DTSTART:20150505T150000Z
DTEND:20150505T160000Z
UID:TALK59068@talks.cam.ac.uk
CONTACT:Dr Jennifer Hoyal Cuthill
DESCRIPTION:Temperature-dependencies of metabolic rates including photosyn
 thesis and respiration could mean that large-scale ecosystem processes ope
 rated differently in past warm climate states\, and may do so again under 
 anthropogenic global warming. It is well known that sinking of organic mat
 ter in the ocean transfers carbon from the surface layer to the deep ocean
  reservoir causing a replacement flux of CO2 from the atmosphere (the biol
 ogical pump). The efficiency of this process may be temperature-dependent 
 because metabolic rates in heterotrophic bacteria and other respiring orga
 nisms are much more sensitive to temperature than are rates of primary pro
 duction. Faster respiration rates in the warmer Eocene ocean may have resu
 lted in more rapid remineralization of sinking organic matter higher in th
 e water column\, and hence a less efficient biological pump\, with implica
 tions for carbon and nutrient cycling\, rates of organic matter burial\, a
 nd potential feedbacks on global temperature via the CO2 greenhouse effect
 . 
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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