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SUMMARY:Our ocean in motion: How currents carry plankton\, and how that af
 fects palaeoproxy reconstructions - Erik van Sebille\, Imperial College Lo
 ndon
DTSTART:20160510T150000Z
DTEND:20160510T160000Z
UID:TALK62568@talks.cam.ac.uk
CONTACT:Alex Piotrowski
DESCRIPTION:The ocean is in constant motion\, with water circulating withi
 n and flowing between basins. As the water moves around\, it caries plankt
 onic marine species such as foraminifera around the globe.\n\nThe most nat
 ural way to study the pathways of water and the transport of foraminifera 
 is using particle trajectories. The trajectories can come from either comp
 uting of virtual floats in high-resolution ocean models\, or from the path
 s of free-flowing observational drifters (surface buoys or Argo floats) in
  the real ocean.\n\nIn this seminar\, I'll give an overview of some recent
  work with particles trajectories\, including applications to marine ecolo
 gy\, palaeoclimatology and marine plastic. Central to each of these studie
 s is the question on how connected the different ocean basins are\, and on
  what time scales water flows between the different regions of the ocean. 
 \n\nIn particular\, I will show that foraminifera\, and thus recorded pala
 eoclimatic conditions\, may originate from areas up to several thousands o
 f kilometres away from where the foraminifera are found on the ocean floor
 \, reflecting an ocean state significantly different from that core site. 
 In the eastern equatorial regions and the western boundary current extensi
 ons\, the offset may reach 1.5 °C for species living for a month and 3.0 
 °C for longer-living species. Oceanic transport hence appears to be a cru
 cial aspect in the interpretation of proxy signals.\n
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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