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Giant ocean eddy shadows Sydney
Date:3/25/2008

CSIRO Wealth from Oceans National Research Flagship scientist, Dr David Griffin, says the birth of the eddy has been traced to last August.

From satellite maps of sea-level we can see that it had been loitering this side of Lord Howe Island for some time and began approaching the NSW coast near Christmas, Dr Griffin says.

It remained stationary during January and simply grew larger but, because it remained offshore, less The giant ocean eddy that cooled Sydneys shores a year ago has been superseded by another 300 km diameter giant. people would have noticed its impacts on water temperatures.

The cold water at the new eddys centre has welled up about 500m from the ocean depths.

In the southern hemisphere, a cold eddy has to rotate clockwise, Dr Griffin says. This one completes a full revolution every 10 days and the sea level at its centre is reduced by nearly 1m, which is how researchers can tell where the eddy is.

Four people who definitely noticed the eddy were the crew who rowed across the Tasman Sea from New Zealand in late December. Skirting its southern boundary, they received a homeward boost of 3km/h or more.

The eddy appears to be on the wane now and the question of interest for oceanographers is what have been the factors that influenced its development and led to its evolution into an ocean feature approaching the size of Tasmania, Dr Griffin says.

Instruments that detect the height of the worlds oceans are carried by satellites such as Jason-1 (Jet Propulsion Laboratory-NASA and the French Space Agency CNES) and the European Space Agencys Envisat. These are valuable aids to scientists developing ocean forecasting systems such as Australias BlueLINK.


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Contact: Dr. David Griffin
david.griffin@csiro.au
61-362-325-244
CSIRO Australia
Source:Eurekalert

Page: 1

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