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SUMMARY:The Biogeochemical Cycle of Iron in the Ocean - Alessandro Tagliab
 ue (University of Liverpool)
DTSTART:20130529T100000Z
DTEND:20130529T110000Z
UID:TALK44019@talks.cam.ac.uk
CONTACT:Dr Andrew Meijers
DESCRIPTION:Over recent decades the micronutrient iron has been demonstrat
 ed to play an important role in regulating ocean productivity\, carbon exp
 ort and the more general biogeochemical cycling of carbon and other nutrie
 nts. \nDue to its role in modulating the biological pump in the Southern O
 cean\, iron availability also exerts a degree of control on atmospheric ca
 rbon dioxide levels.  This has led to speculation about past control of cl
 imate across glacial and interglacial cycles by changes in just iron deliv
 ery to the Antarctic oceans. In this seminar I will use numerical modellin
 g results and observational syntheses to examine a number of these aspects
  of the iron cycle. For example\, how do different sources of iron to the 
 ocean modulate atmospheric carbon dioxide levels and why do glacial condit
 ions resulting in a relatively weak effect when tested in state of the art
  models?  I will examine the vertical profile of iron in some detail and q
 uantify how iron is transported to the mixed layer in the Southern Ocean t
 o be used by the biota\, which enables us to generalise a seasonal cycle o
 f iron supply and demand. Finally\, a number of future challenges and ongo
 ing studies for the better understanding of how iron is cycled in the ocea
 n will be summarised.
LOCATION:British Antarctic Survey\, Room 330B
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