Southern hemisphere ocean heating has been under-estimated
Oceans heating up faster than we thought: study, SMH October 6, 2014 Hannah Francis Oceans in the southern hemisphere are warming faster than anticipated, with implications for rising sea levels and climate modelling.
A team of scientists in California has studied rising temperatures of the southern hemisphere over the decades between 1970 and 2004, and recommended lifting estimates of ocean heat content by between 48 and 152 per cent.
Lead author Paul Durack said it was the first time scientists have been able to quantify how big the gap is between earlier estimates and the reality of rising ocean temperatures.
Sea temperatures are a crucial yardstick for global warming as the ocean stores more than 90 per cent of human-induced excess heat.
Higher sea level temperatures are also closely linked with rising sea levels, because water expands as it warms.
Ocean warming down to two kilometres below the surface accounts for around a third of the annual rate of global mean sea-level rises.
The study by Lawrence Livermore National Laboratory and the California Institute of Technology, published in the journal Nature Climate Change on Monday, attributed the missed estimates to a history of poor sampling of temperatures in the southern hemisphere oceans, which make up 60 per cent of the world’s oceans.
The region, which includes the Indian and South Pacific oceans as well as the South Atlantic and Southern oceans, has not been sampled nearly as frequently to date as oceans in the northern hemisphere…….. http://www.smh.com.au/environment/climate-change/oceans-heating-up-faster-than-we-thought-study-20141005-10qgfn.html#ixzz3FPcZ9tZW
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