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SUMMARY:Controls over mesopelagic mineralisation  - Richard Sanders\, Nati
 onal Oceanographic Centre (NOC) Southampton
DTSTART:20150921T130000Z
DTEND:20150921T140000Z
UID:TALK60898@talks.cam.ac.uk
CONTACT:Claire Waluda
DESCRIPTION:The depth at which organic carbon exported from the surface oc
 ean is remineralised exerts a strong control over atmospheric composition.
  Recent work suggests that remineralisation depth is strongly correlated w
 ith temperature\, however correlation does not imply causality. In this wo
 rk we firstly show that the relationship between temperature and remineral
 isation depth is consistent with the fundamental relationships between tem
 perature and respiration and temperature and viscosity\, implying that the
  relationship may be causative. We then implement it in a numerical model 
 of ocean carbon cycling and show that it leads to organic matter being min
 eralised too deep compared to reality. The implication of this is that env
 ironments not yet sampled such as blooms and upwelling regions in the Sout
 hern Ocean and around the Equator have much shallower mineralisation profi
 les than the open ocean low production biomes we have sampled to date. We 
 will describe future observational programmes to test this hypothesis.  
LOCATION:British Antarctic Survey\, Room 307
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