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SUMMARY:The dominance of biology in driving North Atlantic oxygen trends -
  Rachel Sanders\, British Antarctic Survey
DTSTART:20241127T140000Z
DTEND:20241127T150000Z
UID:TALK221197@talks.cam.ac.uk
CONTACT:Dr Yohei Takano
DESCRIPTION:In recent decades\, the global ocean oxygen concentration has 
 been declining\, but this decline is underestimated in numerical ocean mod
 els by as much as 50%. Several mechanisms are responsible for this deoxyge
 nation\, including solubility-driven changes in surface fluxes and biologi
 cal processes\; however\, the importance of each mechanism is unclear. By 
 linking changes in the different processes to those driving change in temp
 erature and dissolved inorganic carbon\,  we can determine the magnitude 
 of each driver of oxygen change. We show that a consistent oxygen decrease
  in the surface ocean of the North Atlantic has been dominated by an incre
 ase in biological oxygen consumption due to increased remineralisation. At
  its peak\, biological consumption is responsible for more than 50% of the
  total deoxygenation and may be a cause of the mismatch between modelled a
 nd observed deoxygenation. Although the direct impact of warming is lower\
 , deoxygenation due to solubility change has trebled in the past twenty ye
 ars\, suggesting it will become an increasingly significant driver of ocea
 n deoxygenation with future warming.
LOCATION:BAS Seminar Room 1\; https://bas-ac-uk.zoom.us/j/91997012493
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