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CATEGORIES:Sedgwick Club talks
SUMMARY:The geological record of ocean Acidification - Pro
 f. Andy Ridgwell\, University of Bristol
DTSTART;TZID=Europe/London:20130128T170000
DTEND;TZID=Europe/London:20130128T180000
UID:TALK39407AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/39407
DESCRIPTION:The future consequences of ocean acidification for
  marine ecosystems are difficult to assess\, in pa
 rt because laboratory experiments are limited by t
 heir necessary short time-scales and reduced ecolo
 gic complexity. In contrast\, the geological recor
 d is replete not only with a variety of global env
 ironmental perturbations that may include ocean ac
 idification\, but also associated biotic responses
  including adaptation and evolution. However\, for
  the geological record to provide future-relevant 
 information about potential species and ecosystem 
 responses\, qualitatively (and ideally quantitativ
 ely)similar changes in carbonate chemistry to thos
 e projected for the future\, must have occurred. F
 or long-term (million year) intervals of quasi ste
 ady state in throughput of carbonate carbon weathe
 ring vs.sedimentary burial)\, we already know that
  high pCO2 and low ocean surface pH does not imply
  reduced carbonate saturation and hence pressure o
 n marine calcifiers\, although this issue continue
 s to cause confusion in the climate change debate.
  Rapid\, future-like events in contrast\, are char
 acterized by a strong coupled decline in both pH a
 nd saturation in response to CO2 emissions. I this
  talk I will address the questions: at what rate o
 f atmospheric pCO2 change does ocean acidification
  become qualitatively similar to current and futur
 e changes\, and have any events in the geological 
 past exhibited the characteristics of anthropogeni
 c ocean acidification?
LOCATION:Harker Room 1\, Department of Earth Sciences
CONTACT:Lois Salem
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