Researchers see a global pattern of emerging hotspots as currents migrate toward poles
By Summit Voice
SUMMIT COUNTY — An ever-expanding network of sensitive measuring devices, including ocean buoys is enabling researchers to get a better handle on the magnitude and scale of global climate change, including a patterned emergence of ocean hotspots alongside currents that wash the east coast of the major continents.
The warming in those areas far exceeds the average rate of ocean warming, according to research published the journal Nature Climate Change this week.
“We would expect natural change in the oceans over decades or centuries but change with such elevated sea surface temperatures in a growing number of locations and in a synchronised manner was definitely not expected,” said Dr. Wenju Cai, of the Commonwealth Scientific and Industrial Research Organisation.
According to Cai, the finding has local ecological implications in the region surrounding the hotspots, but the major influence is upon the ocean’s ability to take up heat and carbon from the atmosphere.
In Australia’s case, scientists report intensifying east-west winds at high latitudes (45 degrees to 55 degrees south) pushing southward and speeding up the gyre or swirl of currents circulating in the South Pacific, extending from South America to the Australian coast. The resulting changes in ocean circulation patterns have pushed the East Australian Current around 350 kilometres further south, with temperatures east of Tasmania as much as two degrees warmer than they were 60 years ago.
“We would expect natural change in the oceans over decades or centuries but change with such elevated sea surface temperatures in a growing number of locations and in a synchronised manner was definitely not expected,” Cai said.
“Detecting these changes has been hindered by limited observations but with a combination of multi-national ocean watch systems and computer simulations we have been able to reconstruct an ocean history in which warming over the past century is 2-3 times faster than the global average ocean warming rate,” he added.
The changes are characterised by a combination of currents pushing nearer to the polar regions and intensifying with systematic changes of wind over both hemispheres, attributed to increasing greenhouse gases.
Cai said the increase of carbon dioxide and other greenhouse gases in the atmosphere has been the major driver of the surface warming of the Earth over the 20th century.
He said the research points to the need for a long-term monitoring network of the western boundary currents. In March next year, Australian scientists plan to deploy a series of moored ocean sensors across the East Australian Current to observe change season-to-season and year-to-year.
Lead author of the paper was Dr Lixin Wu, of the Ocean University of China, with contributing authors from five countries, many of whom are members of the Pacific Ocean Panel working under the auspices of the World Meteorological Organisation.
The research was partly funded by a grant from the Australian Climate Change Science Program supported by the Australian Department of Climate Change and Energy Efficiency.