«Breaking News» Ocean temperatures rising faster than previously...

The world´s oceans are rising in temperature faster than previously believed as they absorb most of the world's growing climate-changing emissions, scientists said Thursday.

Ocean heat - recorded by thousands of floating robots - has been setting records repeatedly over the last decade, with 2018 expected to be the hottest year yet, displacing the 2017 record, according to an analysis by the Chinese Academy of Sciences.

That is driving sea level rise, as oceans warm and expand, and helping fuel more intense hurricanes and other extreme weather, scientists warn.

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The world´s oceans are rising in temperature faster than previously believed as they absorb most of the world's growing climate-changing emissions, scientists have said. 

HOW OCEAN TEMPERATURES ARE MONITORED 

For the last 13 years, an ocean observing system called Argo has been used to monitor changes in ocean temperatures, Cheng said, leading to more reliable data that is the basis for the new ocean heat records.

The system uses almost 4,000 drifting ocean robots that dive to a depth of 2,000 metres every few days, recording temperature and other indicators as they float back to the surface.

Through the data collected, scientists have documented increases in rainfall intensity and more powerful storms such as hurricanes Harvey in 2017 and Florence in 2018.

 

The warming, measured since 1960, is faster than predicted by scientists in a 2013 Intergovernmental Panel on Climate Change report that looked at ocean warming, according to the study, published this week in the journal Science.

'It´s mainly driven by the accumulation of greenhouse gases such as carbon dioxide in the atmosphere due to human activities,' said Lijing Cheng, a lead author of the study from the Chinese Academy of Sciences.

The increasing rate of ocean warming 'is simply a signature of increasing greenhouse gases in the atmosphere', Cheng said.

Leading climate scientists said in October that the world has about 12 years left to shift the world away from still rising emission toward cleaner renewable energy systems, or risk facing some of the worst impacts of climate change.

Those include worsening water and food shortages, stronger storms, heatwaves and other extreme weather, and rising seas.

For the last 13 years, an ocean observing system called Argo has been used to monitor changes in ocean temperatures, Cheng said, leading to more reliable data that is the basis for the new ocean heat records.

The system uses almost 4,000 drifting ocean robots that dive to a depth of 2,000 metres every few days, recording temperature and other indicators as they float back to the surface.

Through the data collected, scientists have documented increases in rainfall intensity and more powerful storms such as hurricanes Harvey in 2017 and Florence in 2018.

Cheng explained that oceans are the energy source for storms, and can fuel more powerful ones as temperatures - a measure of energy - rise.

Storms over the 2050-2100 period are expected, statistically, to be more powerful than storms from the 1950-2000 period, the scientist said.

Cheng said that the oceans, which have so far absorbed over 90 percent of the additional sun's energy trapped by rising emissions, will see continuing temperature hikes in the future.

'Because the ocean has large heat capacity it is characterized as a `delayed response´ to global warming, which means that the ocean warming could be more serious in the future,' the researcher said.

'For example, even if we meet the target of Paris Agreement (to limit climate change), ocean will continue warming and sea level will continue rise. Their impacts will continue.'

If the targets of the Paris deal to hold warming to 'well below' 2 degrees Celsius, or preferably 1.5C can be met, however, expected damage by 2100 could be halved, Cheng said.

For now, however, climate changing emissions continue to rise, and 'I don´t think enough is being done to tackle the rising temperatures,' Cheng said.

WHAT IS THE PARIS AGREEMENT? 

The Paris Agreement, which was first signed in 2015, is an international agreement to control and limit climate change.

It hopes to hold the increase in the global average temperature to below 2°C (3.6ºF) 'and to pursue efforts to limit the temperature increase to 1.5°C (2.7°F)'.

It seems the more ambitious goal of restricting global warming to 1.5°C (2.7°F) may be more important than ever, according to previous research which claims 25 per cent of the world could see a significant increase in drier conditions.

In June 2017, President Trump announced his intention for the US, the second largest producer of greenhouse gases in the world, to withdraw from the agreement.  

The Paris Agreement on Climate Change has four main goals with regards to reducing emissions:

1)  A long-term goal of keeping the increase in global average temperature to well below 2°C above pre-industrial levels

2) To aim to limit the increase to 1.5°C, since this would significantly reduce risks and the impacts of climate change

3) Goverments agreed on the need for global emissions to peak as soon as possible, recognising that this will take longer for developing countries

4) To undertake rapid reductions thereafter in accordance with the best available science

Source: European Commission 

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Main photo article The world´s oceans are rising in temperature faster than previously believed as they absorb most of the world’s growing climate-changing emissions, scientists said Thursday.
Ocean heat – recorded by thousands of floating robots – has been setting records repeatedly over the ...

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