MELBOURNE, April 1, 2011 /PRNewswire-Asia/ -- Oceanic wind speeds and wave heights have increased significantly over the last quarter of a century according to a major new study undertaken by Australian researchers.
The results of the research program - the most comprehensive of its kind ever undertaken - have been published in the prestigious journal Science.
Studies of climate change typically consider measurements or predictions of temperature over extended periods of time. However this study examined global changes of oceanic wind speed and wave height, which are also important environmental indicators.
It was authored by former Swinburne University Vice-Chancellor Professor Ian Young, who earlier this month became Vice-Chancellor of the Australian National University and Swinburne oceanographers Professor Alex Babanin and Dr Stefan Zieger.
"Winds and waves control the flux of energy from the atmosphere to the ocean," Professor Young said. "So an understanding of whether their parameters are changing on a global scale is very important."
In conducting the study, the researchers analysed satellite data over a 23 year period from 1985 to 2008.
"We found a general global trend of increasing values of wind speed and, to a lesser degree, wave height over this period. The rate of increase for extreme events was most significant."
The data showed that wind speeds over the majority of the world's oceans increased by 0.25 to 0.5 per cent every year. For extremely high winds, speed increased by a yearly average of 0.75 per cent.
The global increase in wave height was most significant for extreme waves, with the largest one per cent increasing by an average of 0.5 per cent every year. However in some parts of the ocean, extreme waves increased by up to one per cent per annum.
"Extreme wave heights have increased by an average of 0.25 per cent a year in equatorial regions and up to 0.5 per cent in some parts of Indonesian, Chinese and Vietnamese coasts," Professor Babanin said.
