I wish I had your optimismLelekPL wrote: ↑October 14th, 2020, 1:24 pm
A place for more serious off-topic discussion and debates.
Hello NF, here's your daily dose of anxiety and dread.
https://www.vox.com/21536859/arctic-sea ... ars-charts
Braving the elements like this is part of essential research: Sea ice is a bellwether of the climate change in the Arctic. Due to our ever-increasing greenhouse gas emissions, the Arctic surface air temperatures have been warming rapidly — at twice the rate of the global average.
Historically, during the winter, sea ice has covered a vast swath of the Arctic Ocean, which fills much of the Arctic Circle. But as temperatures rise, it has been shrinking 12 percent every decade since measurements began in 1979.
Sea ice coverage fluctuates seasonally, hitting a low in September before forming again as temperatures drop in the fall — and expanding again by two to three times by the end of the winter in March. Webster and her team surveyed the summer conditions and the beginning of the “re-freeze.” But this year, that regrowth has been slower than ever. As October comes to a close, sea ice is at its lowest level for the month in recorded history.
Changes in the ice are part of a larger “cascade effect,” as Webster describes it, in which delayed winter ice growth leads to thinner ice, which melts more easily in the summer months compared to older, thicker sea ice. This creates more open ocean.
This transformation contributes to both regional and global warming. Where a white sea ice surface would have reflected sunlight, the dark water absorbs heat, which further reduces ice growth. This change in albedo (or reflectivity) on sea and land in the Arctic is one of the main reasons the region is heating at twice the global average rate, according to the National Oceanic and Atmospheric Administration’s 2019 Arctic Report Card. According to the recent Nature Communications study, it will also be a significant contributor to global warming.
Near Greenland — which holds a massive ice sheet — the warming loop set off by sea ice loss has a minor effect on its warming, but not a substantial effect on the ice sheet itself, researchers found in a 2019 study in Geophysical Research Letters.
The sea ice shift could also impact seasonal weather, potentially intensifying extreme weather. However, Labe says the issue requires further research. “Scientists are actively studying the connections between Arctic sea ice loss and wintertime weather patterns in North America, Europe, and Asia,” he said. “However, these relationships remain highly uncertain in the scientific literature and for seasonal weather forecasts.”
https://www.vox.com/21536859/arctic-sea ... ars-charts
https://www.theguardian.com/science/202 ... tists-findScientists have found evidence that frozen methane deposits in the Arctic Ocean – known as the “sleeping giants of the carbon cycle” – have started to be released over a large area of the continental slope off the East Siberian coast, the Guardian can reveal.
High levels of the potent greenhouse gas have been detected down to a depth of 350 metres in the Laptev Sea near Russia, prompting concern among researchers that a new climate feedback loop may have been triggered that could accelerate the pace of global heating.
The slope sediments in the Arctic contain a huge quantity of frozen methane and other gases – known as hydrates. Methane has a warming effect 80 times stronger than carbon dioxide over 20 years. The United States Geological Survey has previously listed Arctic hydrate destabilisation as one of four most serious scenarios for abrupt climate change.
The scientists – who are part of a multi-year International Shelf Study Expedition – stressed their findings were preliminary. The scale of methane releases will not be confirmed until they return, analyse the data and have their studies published in a peer-reviewed journal.
But the discovery of potentially destabilised slope frozen methane raises concerns that a new tipping point has been reached that could increase the speed of global heating.
The Arctic is considered ground zero in the debate about the vulnerability of frozen methane deposits in the ocean.
With the Arctic temperature now rising more than twice as fast as the global average, the question of when – or even whether – they will be released into the atmosphere has been a matter of considerable uncertainty in climate computer models.
Joined: November 2020
I think this is the main problem. If the climate had changed dramatically, natural disasters would have hit us massively, then the number of victims would probably make us think about how we live, how we exploit the resources of our planet and deplete it. After all, even now it is banal to open temperature charts by region, you can see that the climate is changing. For example, there is an area in which at the beginning of November there was usually already snow, light frost. And now the weather is warm in the same area. And this is not an isolated case, but a trend in recent years. On the one hand, this may be good, but on the other, what will happen if the soil melts in regions where there was permafrost? Perhaps, some infections will be reactivated, for which we are completely unprepared. From somewhere on our heads took COVID. Where is the guarantee that no more rubbish will appear? I really hope that over time, humanity will come to its senses and will help in this observation from near-earth orbit. Therefore, I watch with interest the development of such new companies as the aerospace company in UK. I believe that accurate data on changes will help us live right, without destroying the planet and ourselves.LelekPL wrote: ↑October 14th, 2020, 1:24 pm
Joined: February 2011