March 14 news item on news.com.au (copied below) reported a “…monster whirlpool off the NSW coast”. The Australian CSIRO are quoted, “Dubbed a sea “monster” by CSIRO oceanographers…”.
Something about this article rang out of tune with me, I was sure I had heard that eddies in the East Australian Current (EAC) were commonplace and I recall Sydney-Hobart racing yachts having to sail close inshore at times to get the best ride south.
A few minutes searching in Google produced this informative website where satellite images of the EAC show eddies here and there.
Also specifically mentioning “…generates ocean eddies as broad as 200 kilometres across”. It is fascinating that one of the authors of this “Information Sheet” is quoted in the news.com.au, Daily Telegraph article on 14 March. It looks crystal clear that the media article is a result of CSIRO choosing to beat-up and exaggerate the normal in response to reports of cold water at Sydney beaches.
Finally, the UK Met Office Hadley Centre SST (sea surface temperature) data shows recent temperatures for the grid cell 30 to 35 South and 150 to 155 East to be similar to those of 110 to 130 years ago and January – February 2007 were both less than 0.5 degree above the average for 1961 to 1990. SST ata sourced at the KNMI ClimateExplorer.
All boringly normal. How has public service science got to be in such a state ?
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Satellites track monster whirlpool off the NSW coast
By Saffron Howden
March 14, 2007 12:00am
Article from: news.com.auA MASSIVE, mysterious whirlpool of cold water has developed off the coast of Sydney, forcing the sea surface to fall almost 1m and ocean currents to change course.
Dubbed a sea “monster” by CSIRO oceanographers, the huge body of water stretches almost 200km across and plunges 1000m towards the ocean floor. Its centre sits just 100km off the coast of Sydney and could stay there for months.
Scientists are baffled by the powerful cold-water eddy, which is invisible to the human eye but can be tracked through satellite images.
At its centre the sea level has dropped by 70cm, while the water 400m below the surface is 6C colder than normal at that depth.
The East Australian Current has been forced to divert around the eddy, which takes one week to do a full rotation in a clockwise direction. A second eddy of similar proportions is sitting further out from the coast.
CSIRO satellite oceanographer Dr David Griffin said fishers passing through the eddies in their boats would not feel the slow whirlpools.
However, they would notice a line of debris forming at the edges.
Beachgoers can feel the effects of the whirlpool closer to shore as it forces water from the ocean depths up over the continental shelf.
The cooler water can bring down the temperature at Sydney’s beaches by several degrees.
Oceanographers noticed the eddy forming in January.
Dr Griffin said it contributed to the surprisingly cool sea temperatures – down to a numbing 14C – swimmers felt at their favourite spots this summer.
“To break a (temperature) record like that you need a bunch of things to happen,” Dr Griffin said.
But fish and other marine life felt the changes most, he said. Some would be attracted to the cooler water and others would shy away.
Experts are unsure how long the two whirlpools will sit off Australia’s east coast, or how they will affect marine ecosystems.
“The eddies in this part of the world are very hard to predict,” Dr Griffin said.
They naturally drift westwards but keep bumping up against the shore and may be re-energised by other tidal and weather patterns, he said.
The whirlpool will today be discussed in Hobart at a meeting of 200 Australian, European and US scientists working with satellite images to map water temperatures.