Poles warming up, another glacier sliding into the sea

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Poles warming up, another glacier sliding into the sea

Postby HBS Guy » 08 Nov 2017, 22:01

Human-caused climate change via fossil fuel burning produces a number of stranger things. And some of the weirdest happen to occur in the polar regions of our world.

One of the foremost of these odd impacts is called polar amplification. Under polar amplification, the warming effects of elevated greenhouse gasses are concentrated at the poles. This is due to reduced reflectivity (albedo) from smaller snow and sea ice concentrations, due to the increased intensity of the greenhouse effect in colder and darker regions, and due to increased energy transfer from lower latitudes into upper latitudes due to weakening of the polar Jet Stream.

Over the next week, this kind of polar amplification is predicted to generate very extreme warm temperatures for both poles of our world.

Image

(Warm winds blowing into the Arctic will produce far above average temperatures this week. Image source: Global and Regional Climate Anomalies.)

In the Arctic, temperatures in both Northern Greenland and on the Siberian side of the Arctic Ocean are predicted to hit ranges higher than 20 degrees Celsius above average (36 degrees Fahrenheit) with some readings over Northeastern Siberia striking near the 30 C above average mark by early next week (54 degrees F). This will produce near or above freezing temperatures over both Siberia and sections of the Arctic Ocean near or north of the 80 degree North Latitude line. Overall, temperatures are predicted to average as high as 4.4 C above average for the entire Arctic. A very considerable warm temperature departure consistent with the heightened levels of global warming the world has been experiencing during recent years.[/quote]

Some above freezing so more melting will be happening.

Nor is the Arctic the only polar region experiencing warming.

In the Antarctic, where temperature variance should be moderating as austral spring shifts toward summer, the exact opposite is occurring. Very warm temperatures hitting more than 20 C above average are expected to sweep across East Antarctica this week and ultimately cross over to West Antarctica. Above freezing or near freezing temperatures in some coastal regions including coastal West Antarctica and over the Amery Ice Shelf in East Antarctica will accompany far warmer than normal, but still below freezing, temperatures inland.

Image
(Even as the Arctic is predicted to heat up, the Antarctic is also expected to experience much warmer than normal conditions. Image source: Global and Regional Climate Anomalies.)


The article describes the weather systems causing this unusual and extreme polar warming. Worth reading.
It’s very early for temperatures over parts of Antarctica to be pushing above freezing. And it’s rather late for such similar temperatures to be continuing to invade so far north into the Arctic. So much warmth will have an ongoing deleterious impact to both sea and land ice as well as snow cover. Contributing to the overall pattern of warming and melt we’ve seen for both Antarctica and the Arctic during recent years as global temperatures have risen into a range from 1 C to 1.2 C above 1880s averages.


https://robertscribbler.com/2017/11/01/extreme-warming-at-the-poles-this-week-arctic-and-antarctic-temperatures-to-rise-to-20-30-c-above-average-in-some-locations/

This warming must have some effect on melting of the ice sheets and retreat of the glaciers.
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Re: Poles warming up, another glacier sliding into the sea

Postby HBS Guy » 08 Nov 2017, 22:53

East Antarctica is stirring!

“Up till now, we basically had a stationary [East Antarctic] ice sheet, and now it’s started to move,” — Catherine Walker, NASA post-doctoral fellow.

*****

East Antarctica. Home to most of the world’s remaining land ice. Scientists previously thought that this last bastion of somewhat stable ice in the world would only slowly succumb to the slings and arrows of human-caused climate change. That its ice giants would still sleep for some time — giving the world more time to stave off or avoid worsening rates of sea level rise. Unfortunately, new evidence reveals that this is not the case. That the best time to act on sea level rise was 20+ years ago, and that the second best time to act, in cutting fossil fuel based CO2 emissions, is now.

Image
(Warm water upwelling near East Antarctica’s Totten Glacier threatens to accelerate global sea level rise. Image source: Texas Institute for Geophysics.)


Unfortunately, I think we will see a lot of Antarctica/Greenland icemelt and huge floods on the US east coast before anything is done to reduce GHG emissions. Fossil fuel interests will ensure it will be so.

Extreme warming now periodically besets this frozen land. Massive ice bergs are breaking off from West Antarctica, rainfall is now observed, at times, all around the frozen continent’s perimeter from west to east, and the vast Pine Island glacier is being undermined by warm water currents — causing it to crack up from the inside out.

Now, according to new research, one of East Antarctica’s largest glaciers — the Totten — is accelerating toward the Southern Ocean. It’s a situation that we warned about in an earlier post as an indicator of worsening risks of speeding sea level rise due to human caused climate change. Unfortunately, new studies by scientists have now confirmed that warm waters encroaching on Totten have already had an impact.

Researchers found that combined warm winds and encroaching warmer ocean currents had caused the glacier to speed up by 5 percent during the period of 2000 to 2006. This acceleration means that the vast glacier — home to enough ice to raise seas by 11-13 feet — is melting faster. It also means that the glacier is starting to succumb to the tremendous global heat forcing provided by human fossil fuel burning around the world. We should caution that this report covers a period from more than a decade ago. And since that time, human-forced global warming has considerably advanced.


https://robertscribbler.com/2017/11/06/sleeping-ice-giants-stir-east-antarcticas-totten-glacier-accelerates-toward-southern-ocean/

Have a read of the article. Very sobering.
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