Melting ice sheets may cause 'climate chaos' according to new modelling

Melting ice sheets may cause 'climate chaos' according to new modelling
The weather these days is wild and will be wilder still within a century. In part, because the water from melting ice sheets off Greenland and in the Antarctic will cause extreme weather and unpredictable temperatures around the globe. Credit: Natalya Gomez, McGill University

The weather these days is wild and will be wilder still within a century. In part, because the water from melting ice sheets off Greenland and in the Antarctic will cause extreme weather and unpredictable temperatures around the globe. A study published today in Nature is the first to simulate the effects, under current climate policies, that the two melting ice sheets will have on ocean temperatures and circulation patterns as well as on air temperatures by the year 2100.

Consequences for ocean circulation and water and air temperatures

"Under current global government policies, we are heading towards 3 or 4 degrees of warming above pre-industrial levels, causing a significant amount of melt from the Greenland and Antarctic Ice Sheets to enter Earth's oceans. According to our models, this melt water will cause significant disruptions to and change levels of warming around the world," says Associate Professor Nick Golledge from Victoria University of Wellington's Antarctic Research Centre in New Zealand. He led the international research team made up of scientists from Canada, New Zealand, the UK, Germany and the USA.

The research team combined highly detailed simulations of the complex climate effects of the melting with satellite observations of recent changes to the ice sheets. As a result, the researchers have been able to create more reliable and accurate predictions of what will occur under current climate policies.

Warming in Eastern Canada and cooling in Northwestern Europe

Professor Natalya Gomez, from the Department of Earth and Planetary Sciences at McGill contributed to the study by modelling projected changes to around the globe as ice melts into the . The ice sheet simulations suggest that the fastest increase in the rise of sea levels is likely to occur between 2065 and 2075. Melting ice sheets will affect water temperatures and circulation patterns in the world's oceans, which will in turn affect air temperatures—in a complex ice-ocean-atmosphere feedback loop.

Melting ice sheets may cause 'climate chaos' according to new modelling
The researchers believe that the melting ice sheets off Greenland and in the Antarctic will result in changes to ocean temperatures and circulation patterns as well as changes to air temperature in various parts of the globe within a century. Credit: Natalya Gomez
"Water levels would not simply rise like a bathtub," says Gomez. "Some areas in the world, such as the island nations in the Pacific, would experience a large rise in sea level, while close to the ice sheets the sea level would actually fall."

However, the effects of ice sheet melt are far more widespread than simply leading to changes in sea levels. As warmer melt water enters the oceans, for example in the North Atlantic Ocean, major ocean currents such as the Gulf Stream will be significantly weakened. This will lead to warmer air temperatures in the high Arctic, Eastern Canada and Central America, and cooler temperatures over northwestern Europe on the other side of the Atlantic.

Melting ice sheets may cause 'climate chaos' according to new modelling
According to the researchers, current global climate policies set in place under the Paris Agreement do not take into account the full effects of ice sheet melt likely to be seen in the future. Credit: Natalya Gomez
New information to help shape future climate policies

According to the researchers, current global climate policies set in place under the Paris Agreement do not take into account the full effects of ice sheet melt likely to be seen in future.

"Sea level rise from melt is already happening and has been accelerating in recent years. Our new experiments show that this will continue to some extent even if Earth's climate is stabilized. But they also show that if we drastically reduce emissions, we can limit future impacts," says Golledge.


Explore further

Modest warming risks 'irreversible' ice sheet loss, study warns

More information: Global environmental consequences of twenty-first-century ice-sheet melt, Nature (2019). DOI: 10.1038/s41586-019-0889-9, https://www.nature.com/articles/s41586-019-0889-9
Journal information: Nature

Provided by McGill University
Citation: Melting ice sheets may cause 'climate chaos' according to new modelling (2019, February 6) retrieved 23 April 2019 from https://phys.org/news/2019-02-ice-sheets-climate-chaos.html
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Feb 06, 2019
The sky is falling.

Feb 06, 2019
How does ice melt when the US is getting -70 windchill?
Temperatures were below the freezing mark in 85 percent of the country,30, 2019.

Feb 06, 2019
{ Rolls eyes...}
Please, please, please try to grasp the distinction between WEATHER and CLIMATE.
Like a Florida hurricane, your horrid 'Polar Vortex' spin-off will soon be gone again.
Meanwhile, although much of the High Arctic is, unusually, getting 'typical' Arctic conditions, the Spring Thaw will soon begin before enough sea-ice has frozen thickly enough to survive and become 'multi-year'...
http://nsidc.org/...icenews/

Feb 07, 2019
"How does ice melt when the US is getting -70 windchill?

You obviously don't follow the science, or know jack shit about it. You must have been living in a cave, to not have heard all the news about the polar vortex and jet stream changing, as the Arctic warms at least twice as fast as the rest of the world, and how that is effecting weather patterns at lower latitudes. This is bringing cold Arctic air down into the eastern half of the U.S.

Nearly every state in the U.S. has warmed in recent decades.
The number of record high temps has greatly outnumbered the number of record lows in recent decades, in the U.S., and the difference is increasing.


Feb 07, 2019
Spouting absurd denier slogans like "the sky is falling" may seem clever, but is really really Dumb.

The world is warming 16 times faster than the average warming when the Earth came out of the last ice age (glacial period).
Starting 20,000 years ago, it took 11,000 years to warm by 5 C, or 9 F.
That averages 2,200 years for each 1 C warming.
The world has warmed by 1 C since the early 1880 - 138 years
That's because we have increased CO2 100 times faster than nature did at its fastest in the last 450,000 years, and almost certainly in the last 800,000 years. - from ice core data,

So if you think there is nothing to worry about, you haven't a clue.

---

Feb 07, 2019
How does ice melt when the US is getting -70 windchill?
Temperatures were below the freezing mark in 85 percent of the country,30, 2019.

The U.S.A. is not the world (though some appear to think it is). For example, Australia is going through record-breaking heat-waves this summer.

Feb 07, 2019
Little imp denier Goons don't know anything about climate. They can't fathom a 4 degrees Celsius climate change event versus and 8 degree Celsius climate change event.

Feb 07, 2019
Climate changes all the time. Weather worshippers posing as scientists and straphangers are just carrying water for a one-world-government cabal of globalists who wish to control demand for oil, after peak oil, but want to eliminate any informed, meaningful democratic debate about on who the loss will fall.

Believe it when they ban private jets. Until then it's just a croc of bankster crap.

Feb 07, 2019
Earth has been cooling for 8000 years.
California draughts in the past far worse than today. 200-year draughts in the past.
https://www.mercu...pg?w=810

STR
Feb 08, 2019
"under current climate policies"... so the results are already driven by agenda. Ok.

Feb 08, 2019
ubrealone1, wiki sublimation or dry ice or what the hell, evaporation. Also,Phases o0f Water.
Keep in mind, "temperature" is a very crude, almost useless method of measurement. What you need to learn about are Energy Levels.

Were you home schooled or church schooled? To be deprived of this very basic chemistry lesson?

Or, perhaps you are one of the saudi or russian denierbots?

Feb 08, 2019
Does anyone here speak English?
California draughts in the past far worse than today. 200-year draughts in the past.

Feb 08, 2019
Does anyone here speak English?
California draughts in the past far worse than today. 200-year draughts in the past.

I think you mean 'droughts', not 'draughts' (= US 'drafts')

Feb 08, 2019
"Does anyone here speak English? California draughts in the past far worse than today. 200-year draughts in the past." Says the troll with the spelling error, twice.

Feb 10, 2019
https://www.mercu...pg?w=810
California Droughts in the past where 50 to 200 years long according to tree ring data.

Feb 10, 2019
California Droughts in the past where 50 to 200 years long according to tree ring data.

I think this is interesting. What's more interesting to note is that, during these mega droughts, northern hemispheric temperatures were warmer than during the surrounding years (https://www.pnas....full.pdf ). Only recently have temperatures increased above those in the MWP, so what unrealone1 seems to be warning us is that if we don't work to stop global warming/climate change, we run a real risk of having worse droughts in the near future. In fact, even during the mega droughts there were years with normal precipitation, so we might be in one right now. Additionally, studies indicate that we should expect worse droughts in the near future due to the warming (http://advances.s...full.pdf ).

Feb 10, 2019
Who would have thought that unrealone1 would turn out to be a climate change/global warming alarmist?

Feb 10, 2019
How does ice melt when the US is getting -70 windchill?
Temperatures were below the freezing mark in 85 percent of the country,30, 2019.


I know this is a difficult concept. Complex, hard to comprehend. So I'll break it down for you in a way that you'll hopefully understand.

The US is NOT the only place on the planet.


Feb 10, 2019
''The US is NOT the only place on the planet ''

the N hemis. does have most of the land mass though which is where heating and cooling mostly occur

Feb 10, 2019
@Jax
Believe it when they ban private jets
Hmm ... let's apply your logic to something else: house fires
Cooking fires are the number one cause of home fires and home injuries. The leading cause of fires in the kitchen is unattended cooking
https://www.nfpa..../Cooking

excuse 1 - Your stove has been hot before, so it can't be a fire. its natural for the house to be burning

excuse 2 - NFPA wants to control your life, so the house obviously isn't really aflame;
NFPA doesn't want meaningful debate, they just want to hose down the house to control you and set up a global gov't

excuse 3 - until we ban all private cooking appliances, we should ignore the house fire

Feb 17, 2019
Climate in northern Europe reconstructed for the past 2,000 years
https://phys.org/...ars.html
2,000 years and no change?

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