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SUMMARY:Re-thinking controls on the East Australian Current's eddy sheddin
 g and mean poleward extent - Christopher Bull
DTSTART:20181114T110000Z
DTEND:20181114T120000Z
UID:TALK114700@talks.cam.ac.uk
CONTACT:Caroline Holmes
DESCRIPTION:The East Australian Current (EAC) in the western Pacific Ocean
  is Australia’s strongest and most important boundary current\, supporti
 ng Australia’s temperate coastlines by transporting heat poleward. The l
 arge variability of the latitude at which the EAC separates has an importa
 nt impact on local climate and cross-shelf marine ecosystems. For example\
 , in the summer of 2015\, south-east Australian waters observed record tem
 peratures as compared to the previous two decades\; this event is (mostly)
  attributed to an increase in the southward penetration of the EAC. Thus\,
  understanding the mechanisms that control the variability in the EAC exte
 nsion is important for improving future climate projections.\n\nHere\, usi
 ng NEMO and a NEMO-WRF regional coupled simulations\, we present a hierarc
 hy of sensitivity experiments designed to expose the factors that influenc
 e the EAC’s separation. In Part 1\, we look at the role of New Zealand a
 nd nonlinear processes in the partial separation of the EAC. Contrary to p
 revious work\, we find that meridional gradients in the basin-wide wind st
 ress curl are not the sole factor determining EAC separation. In Part 2\, 
 the role of forcing variability in influencing the mean state of the Tasma
 n Sea circulation is investigated. These simulations show an EAC with high
  intrinsic variability and stochastic eddy shedding. We further show that 
 local atmospheric variability leads to increases in eddy shedding rates an
 d southward eddy propagation\, and this leads to an increased extent of th
 e EAC. Given the possible relevance of changes in forcing variability (fro
 m Part 2) for future climate attribution studies\, Part 3 uses a coupled N
 EMO-WRF simulation forced with CMIP5 RCP85 anomalies to extend our underst
 anding of what is driving the southward shift of the EAC in future climate
  model projections.\n
LOCATION:British Antarctic Survey\, Innovation Centre\, Seminar Room 1
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