Navigation Links
Climate Change Signal Detected in the Indian Ocean

'From ocean measurements and by analysing climate simulations we can see there are changes in features of the ocean that cannot be explained by natural variability',said CSIRO oceanographer Dr Gael Alory.

'These oceanic changes are almost certainly linked to changes in the heat structure of the atmosphere and have led to a rise in water temperatures in the sub-tropical Indian Ocean of around two degrees celsius.

'At the same time, we are seeing changes in ocean circulation in tropical regions as a result of a long-term weakening of the Pacific Ocean trade winds. This affects sea surface temperature in regions relevant to the source and distribution of rainfall across southern Australia,' Dr Alory said.

The research by Dr Alory, his CSIRO Wealth from Oceans National Research Flagship colleague, Dr Gary Meyers, and CSIRO Marine and Atmospherics Dr Susan Wijffels has recently appeared in the journal, Geophysical Research Letters. The paper examines trends in Indian Ocean temperatures over 40 years that can help scientists and resource managers understand fluctuations in rainfall patterns over southern Australia.

The research, contributing to the Australian Climate Change Science Program and partly funded by the South East Australia Climate Initiative, combined access to ocean observations using the volunteer ships of opportunity program and a set of models used by scientists in developing the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment. Thanks to the operators and crew of commercial ships, Australian scientists have access to a regular series of ocean measurements to a depth of 800 metres across the Indian Ocean.

'The cooling is occurring between Australia and Indonesia where the Indonesian throughflow emerges into the Indian Ocean and is linked to the observed weakening of Pacific Ocean trade-winds,'

The teams key findings were:

a general warming of the ocean surface indicating the influence of rising atmospheric temperatures;
a strong warming (about 2C over 40 years) between 40S and 50S down to a depth of 800 metres;
and, sub-surface cooling in the tropics due to deep waters rising closer to the surface.

Dr Alory says the research confirmed a long-held view that temperature changes in the Pacific and Indian oceans can be partly explained by the effect of the Indonesian throughflow a system of currents which transports water between the oceans through the maze of straits and passages in the Indonesian Archipelago.

'The cooling is occurring between Australia and Indonesia where the Indonesian throughflow emerges into the Indian Ocean and is linked to the observed weakening of Pacific Ocean trade-winds,' he says. The models also helped to explain trends in the subtropical Indian Ocean temperatures and changes in relevant ocean features. In this area, the deep-reaching warming is due to a strengthening of westerly winds drawing a southward shift in ocean current patterns. These findings are consistent with research in the South Atlantic and South Pacific ocean basins.

He said that the change in atmospheric conditions altering ocean temperatures weakening of Pacific Ocean trade winds and strengthening of westerly winds have been mostly attributed to human activity: the production of aerosols (tiny atmospheric particles), ozone depletion, and greenhouse gases. Strengthening westerlies are related to changes in the Southern Annular Mode an atmospheric feature similar to the El Nino Southern Oscillation and considered the dominant influence on Southern Hemisphere atmospheric variability.

Dr Alory said climate models used in the IPCC Fourth Assessment show that changes in westerly wind patterns are expected to intensify in a global warming scenario and to accentuate the southward shift in sub-tropical ocean circulation patterns.


'"/>




Related medicine news :

1. Trees to Predict Climate Change
2. A Timely Reminder Of Devastating Health Impact Of Climate Change
3. Impact of Climate Change in Africa
4. Climate Sceptics Issued With Challenge by a U.K Scientist
5. Climate Change can Raise Incidence of Disease: Expert
6. Penguin: an Alternative Bio-indicator to Monitor Climate Change
7. Latest IPCC Report Highlights Need for Integrated Climate/human Behavior Models
8. Kolkata, Mumbai to Face Maximum Brunt of Climate Change
9. Climate Change Threatens Sundarbans and World Heritage Sites
10. Experts Congregate for UN Climate Summit in Bangkok
11. Capricious Climate in Indonesia Adds to Farmers’ Wo
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/26/2016)... Michigan (PRWEB) , ... June 26, 2016 , ... ... to fertility once they have been diagnosed with endometriosis. These women need a ... they also require a comprehensive approach that can help for preservation of fertility ...
(Date:6/25/2016)... ... ... The temporary closing of Bruton Memorial Library on June 21 due to a possible lice ... overlooked aspect of head lice: the parasite’s ability to live away from a human host, ... a necessary one in the event that lice have simply gotten out of control. , ...
(Date:6/25/2016)... Beach, CA (PRWEB) , ... June 25, 2016 , ... ... UCLA with Magna Cum Laude and his M.D from the David Geffen School of ... Diego and returned to Los Angeles to complete his fellowship in hematology/oncology at the ...
(Date:6/25/2016)... Montreal, Canada (PRWEB) , ... June 25, 2016 , ... ... the pursuit of success. In terms of the latter, setting the bar too high ... low, risk more than just slow progress toward their goal. , Research from ...
(Date:6/24/2016)... Michigan (PRWEB) , ... June 24, 2016 , ... June ... about the dangers associated with chronic pain and the benefits of holistic treatments, ... individuals who are suffering with Sickle Cell Disease. , Sickle Cell Disease (SCD) is ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... June 24, 2016  Collagen Matrix, Inc., ("Collagen ... and manufacturing of collagen and mineral based medical ... that Bill Messer has joined the ... further leverage the growing portfolio of oral surgery, ... Bill joins the Collagen Matrix executive team ...
(Date:6/24/2016)... , June 24, 2016 ... of the "Structural Electronics 2015-2025: Applications, Technologies, ... In-Mold Electronics, Smart Skin, ... Photovoltaics Structural electronics involves electronic ... load-bearing, protective structures, replacing dumb structures such as ...
(Date:6/24/2016)... , June 24, 2016 Research and ... Market for Companion Diagnostic Tests" report to their offering. ... for Companion Diagnostics The World Market for ... personalized medicine diagnostics. Market analysis in the report includes the ... Market (In Vitro Diagnostic Kits) by Region (N. America, EU, ...
Breaking Medicine Technology: