Navigation Links
Earth's water cycle intensifying with atmospheric warming

A clear change in salinity has been detected in the world's oceans, signalling shifts and an acceleration in the global rainfall and evaporation cycle.

In a paper published in the journal Science, Australian scientists from the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Lawrence Livermore National Laboratory, California, reported changing patterns of salinity in the global ocean during the past 50 years, marking a clear fingerprint of climate change.

Lead author, Dr Paul Durack, said that by looking at observed ocean salinity changes and the relationship between salinity, rainfall and evaporation in climate models, they determined the water cycle has strengthened by four per cent from 1950-2000. This is twice the response projected by current generation global climate models.

"Salinity shifts in the ocean confirm climate and the global water cycle have changed.

"These changes suggest that arid regions have become drier and high rainfall regions have become wetter in response to observed global warming," said Dr Durack, a post-doctoral fellow at the Lawrence Livermore National Laboratory.

With a projected temperature rise of 3C by the end of the century, the researchers estimate a 24 per cent acceleration of the water cycle is possible.

Scientists have struggled to determine coherent estimates of water cycle changes from land-based data because surface observations of rainfall and evaporation are sparse. However, according to the team, global oceans provide a much clearer picture.

"The ocean matters to climate it stores 97 per cent of the world's water; receives 80 per cent of the all surface rainfall and; it has absorbed 90 per cent of the Earth's energy increase associated with past atmospheric warming," said co-author, Dr Richard Matear of CSIRO's Wealth from Oceans Flagship.

"Warming of the Earth's surface and lower atmosphere is expected to strengthen the water cycle largely driven by the ability of warmer air to hold and redistribute more moisture."

He said the intensification is an enhancement in the patterns of exchange between evaporation and rainfall and with oceans accounting for 71 percent of the global surface area the change is clearly represented in ocean surface salinity patterns.

In the study, the scientists combined 50-year observed global surface salinity changes with changes from global climate models and found "robust evidence of an intensified global water cycle at a rate of about eight per cent per degree of surface warming," Dr Durack said.

Dr Durack said the patterns are not uniform, with regional variations agreeing with the 'rich get richer' mechanism, where wet regions get wetter and dry regions drier.

He said a change in freshwater availability in response to climate change poses a more significant risk to human societies and ecosystems than warming alone.

"Changes to the global water cycle and the corresponding redistribution of rainfall will affect food availability, stability, access and utilization," Dr Durack said.

Dr Susan Wijffels, co-Chair of the global Argo project and a co-author on the study, said maintenance of the present fleet of around 3,500 profilers is critical to observing continuing changes to salinity in the upper oceans.

Contact: Craig Macaulay
CSIRO Australia

Related biology news :

1. Experts to discuss global water crisis
2. Commercial aquatic plants offer cost-effective method for treating wastewater
3. UNC study on properties of carbon nanotubes, water could have wide-ranging implications
4. Waterborne disease risk upped in Great Lakes
5. Turning freshwater farm ponds into crab farms
6. Ripple effect: Water snails offer new propulsion possibilities
7. NJIT professors research suggests changes in underwater data communications
8. Providing toilets, safe water is top route to reducing world poverty: UN University
9. Cold water corals conference to be held in Woods Hole
10. Scientists achieve first tracking of salmon from headwaters in Rockies through Pacific to Alaska
11. Scripps Florida scientists awarded $1.5M to fight major water and food parasites
Post Your Comments:
(Date:10/29/2015)... ARBOR, Mich. , Oct. 29, 2015 /PRNewswire/ ... Eurofins Genomics for U.S. distribution of its DNA ... DNA-seq kit and Rubicon,s new ThruPLEX Plasma-seq kit. ... to enable the preparation of NGS libraries for ... plasma for diagnostic and prognostic applications in cancer ...
(Date:10/29/2015)... , Oct. 29, 2015 Today, ... announced a partnership with 2XU, a global leader ... deliver a smart hat with advanced bio-sensing technology. ... other athletes to monitor key biometrics to improve ... strategic partnership, the two companies will bring together the ...
(Date:10/27/2015)... Calif. , Oct. 27, 2015 Synaptics Inc. ... solutions, today announced that Google has adopted the Synaptics ... touch controller solutions to power its newest flagship smartphones, ... by Huawei. --> ... like Google to provide strategic collaboration in the joint ...
Breaking Biology News(10 mins):
(Date:11/30/2015)... ... November 30, 2015 , ... ... physicians, aesthetic practitioners and aesthetics professionals from Central America and abroad for the ... in Panama City, Panama Feb. 17-19, 2016. Testart will present and discuss new ...
(Date:11/30/2015)... 1, 2015 /PRNewswire/ - BioAmber Inc. (NYSE: BIOA ), a ... the American Business Act on Climate Pledge, alongside more than ... with the Obama Administration to demonstrate an ongoing commitment to ... to the COP21 Paris climate negotiations. ... Sarnia, Canada . --> BioAmber uses ...
(Date:11/30/2015)... 30, 2015 Spherix Incorporated (Nasdaq: ... the fostering and monetization of intellectual property, today ... initiatives designed to create shareholder value. ... Spherix. "Based on published reports, the total addressable ... billion and Spherix will seek to secure fair ...
(Date:11/30/2015)...  HUYA Bioscience International, the leader in accelerating global ... today announced it has signed a Memorandum of Understanding ... collaboration between KDDF and HUYA with the ultimate goal ... for the global market. China,s ... innovative preclinical and clinical stage compounds. The company advances ...
Breaking Biology Technology: