A five-nation oceanographic team is taking the first steps in a $3.6 million project studying the major flow of ocean currents between Asia and Australia and how they influence rainfall across Southern Australia and Indonesia.
Scientists are investigating fluctuations in the flow of warm waters from the western Pacific Ocean draining through the Indonesian Archipelago into the Indian Ocean north of Australia.
"Our climate, and particularly the amount of rainfall across the country, is regulated by the oceans around Australia," says CSIRO's Dr Susan Wijffels.
"Through new satellite and sub-surface technologies we are gradually building a picture of these key influences on rain-bearing cloud band systems in the eastern Indian Ocean. Over the next three years we hope to understand the variations that occur to the flow of currents including any effects of El Nino and La Nina events," Dr Wijffels says.
Dr Wijffels is co-leader of the project, called INSTANT. Sub-surface ocean monitoring equipment valued at more than $2 million has been moored at strategic 'choke' points across the entry of the currents into Indonesia waters, and their exit to the Indian Ocean through Lombok and Ombai Straits and Timor Passage.
Partially funded by the Australian Greenhouse Office and CSIRO, the array of tidal gauges and ocean moorings will sample pressures, currents, temperature and salinity and provide a record of changing conditions.
Dr Wijffels says the INSTANT science team, comprising US, French, Dutch and Indonesian scientists, has successfully deployed highly sophisticated measuring instruments in the straits from the Indonesian research vessels, Baruna Jaya I and VIII.
She says the data collected will be compared with simple models and computer simulations of the tropical oceans, and the way the oceans then interact with the atmosphere.
"The atmosphere is very sensitive to the distribution of warm waters near the equator. In our region two large warm water pools exist - in the Western Pacific and Eastern Indian Ocean.
"We believe the exchange of warm low salinity water between the Pacific and Indian Oceans through the Indonesian passages will yield critical information on how these two 'pools' of warm water in our region interact."
Dr Wijffels says it will be at least 18 months before scientists can retrieve the information obtained from the ocean instruments, which are sub-surface and will be serviced and redeployed by the INSTANT team using Indonesian ships in 2005.
Indonesian participation in the project will also have broad benefits, according to joint project Director, Dr Ir. Indroyono Soesilo, of the Indonesian Agency for Marine and Fisheries Research.
"Improved climate predictions will benefit many people living in areas affected by El Nino/La Nina and the Asian-Australian Monsoon," Dr Soesilo says.
"The Republic of Indonesia is strongly affected by these phenomena, and will be able to use the model projections to make informed management decisions regarding agricultural, water and fisheries resource issues and prepare for climate-related forest fires.
"Measurements of the way these waters mix in regions such as the Flores and Banda Seas will provide an important understanding of the processes that sustain fisheries stocks in these seas."
Dr Tony Haymet, Chief of CSIRO Marine Research, emphasises that the INSTANT team research is both an important international research project in its own right, and also a key step in the steady expansion of CSIRO's research with partners in the oceans north and west of Australia.
Australia has an extensive oceans and climate research program, particularly in the Indian and Southern Oceans, and participates in many international monitoring projects such as the global float array Argo.
Source:
CSIRO
Related stories:
Understanding autumn rain decline in SE Australia
According to a report from a CSIRO Wealth From Oceans Flagship study – published this week in the science journal
Geophysical Research Letters – since 1950 Victoria has suffered a 40 per cent decline in autumn rainfall (March to May) compared to the average recorded between 1961–90.
Ocean 'supergyre' link to climate regulator
Australian scientists have identified the missing deep ocean pathway – or ‘supergyre’ – linking the three Southern Hemisphere ocean basins in research that will help them explain more accurately how the ocean governs global climate.
Climate change signal detected in the Indian Ocean
The signature of climate change over the past 40 years has been identified in temperatures of the Indian Ocean near Australia.
Deep sea pipelines to green gas production
(PhysOrg.com) -- University of Queensland researchers are working to tap into a wealth of natural gas resources located in distant, deep-ocean fields off the coast of Western Australia.
Satellites collect data on sea temperatures, reefs
(AP) -- Satellites are helping scientists expand a virtual network to watch for increases in ocean temperatures that can damage or kill the fragile ecosystems of coral reefs worldwide.
Hundreds of new marine species discovered: Australian scientists
Hundreds of new marine species and previously uncharted undersea mountains and canyons have been discovered in the depths of the Southern Ocean, Australian scientists said Wednesday.
Deepest living fishes caught on camera for the first time
(PhysOrg.com) -- Scientists filming in one of the world's deepest ocean trenches have found groups of highly sociable snailfish swarming over their bait, nearly five miles (7700 metres) beneath the surface of the Pacific Ocean. This is the first time cameras have been sent to this depth.
NASA study finds rising Arctic storm activity sways sea ice, climate
A new NASA study shows that the rising frequency and intensity of arctic storms over the last half century, attributed to progressively warmer waters, directly provoked acceleration of the rate of arctic sea ice drift, long considered by scientists as a bellwether of climate change.