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Highlights of the IMOS observations of ocean currents

Highlights of the IMOS observations of ocean currents. David Griffin and Madeleine Cahill. 13 February 2014. CSIRO Marine and Atmospheric Research. Extreme Bonney Coast upwelling last week, seen by satellites and tidegauges.

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Highlights of the IMOS observations of ocean currents

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  1. Highlights of the IMOS observations of ocean currents David Griffin and Madeleine Cahill 13 February 2014 CSIRO Marine and Atmospheric Research

  2. Extreme Bonney Coast upwelling last week, seen by satellites and tidegauges

  3. ..and HF radar. One of the strongest recorded.5 Feb 2014. NB Eyre Peninsula.

  4. 4 Feb 2014. Radars confirm modelled velocity.

  5. 5 Feb 2014

  6. NSW: Wind and EAC eddy conspire to drive strong upwelling

  7. Radar sees Perth Canyon cyclonic eddy:

  8. -and Rottnest Island upwelling plume

  9. Marion Plateau Eddy

  10. In BRAN, the EAC normally goes straight across the complex topography of the SGBR.

  11. sometimes a 50km eddy forms. 0.5m/s currents 10cm sea level anomaly Line=Altimeter track

  12. IMOS CBG (Capricorn Bunker Group) HF radar comprises antennas at TAN and LEI

  13. SST and radar suggest a ~50km cyclonic eddy over the Plateau Jul 16 2010 10:30

  14. track-normal altimeter velocities are fairly consistent with the radar velocities +2 weeks to Jul 30 2010

  15. 26 Aug 2008 • Radar sees ~50km anticyclonic eddy • and a v small (~10km) cyclonic eddy forming at shelf edge

  16. 29 Aug 2008 10:30 • Altimeter samples both the meso and sub-mesoscale eddies!

  17. 29 Aug 2008 22:30

  18. 30 Aug 2008 10:30

  19. 30 Aug 2008 22:30

  20. 31 Aug 2008 10:30

  21. 31 Aug 2008 22:30

  22. 1 Sep 2008 10:30

  23. Aug 29 2008: First known transect of a (20km radius) sub-mesoscale eddy. ALES re-processed ‘raw’ 18Hz data. Height (m)

  24. Conclusions Showed a few recent highlights of IMOS data: Extreme Bonnie Coast upwelling last week Co-incident NSW-Vic upwelling Perth canyon sub-mesoscale eddy Rottnest Island ‘plume’ Southern GBR plateau eddies, including first known sampling of height, velocity (and temperature) in a sub-mesoscale eddy. FFI: http://oceancurrent.imos.org.au/

  25. Thank you David.Griffin@csiro.au www.marine.csiro.au/~griffin

  26. Griffin et al. (1987) wondered if a semi-persistent eddy contributed to the mean NW-ward they observed near the 200m isobath.

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