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SUMMARY:Antarctic Bottom Water in CMIP5 models: characteristics\, formatio
 n\, evolution - Céline Heuzé\, University of East Anglia
DTSTART:20141008T130000Z
DTEND:20141008T140000Z
UID:TALK53654@talks.cam.ac.uk
CONTACT:Dr Dan Jones
DESCRIPTION:The bottom of most of the global oceans is filled with Antarct
 ic Bottom Water\, formed via complex processes on the Antarctic shelves. L
 ong thought to take centuries to react to surface forcings\, this water ma
 ss is actually already changing along with global warming\, contributing t
 o steric sea level rise. What about ocean models? Do they capture the obse
 rved trends?\nThis talk will focus on the latest generation of coupled cli
 mate models which contributed to the IPCC Fifth Assessment Report (or CMIP
 5 models). I will first comment on the range of characteristics of present
 -day Southern Ocean bottom water in the models. I will show that the model
 s which form their bottom waters via open ocean deep convection (instead o
 f shelf processes) are the most similar to the observations. In a second p
 art\, we will see how bottom waters change globally under climate change s
 cenarios\, the link between these changes and abyssal volume transports\, 
 and the impact of these changes on sea level rise projections. Finally\, I
  will present preliminary results from sensitivity experiments undertaken 
 with the new HadGEM3 model in order to understand how open ocean deep conv
 ection can occur in climate models.\n
LOCATION:British Antarctic Survey\, Room 330B
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