قالب وردپرس درنا توس
Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Florida glacier is about to change the course of human civilization – Alternet.org

Florida glacier is about to change the course of human civilization – Alternet.org



Iceberg Tages in Western Antarctica is huge and is often called the Earth's most dangerous glacier. It is also called a glacier of the Judgment. The glacier holds two paces from the sea level, but more importantly, it is "back" for four other glaciers that support a further increase in sea level of 10-13 feet. When Thwaites collapses, it will take most of the Western Antarctic with it. This is not new information for those of us who follow science, for example, Eric Rinot in 2014, saying that the loss of Western Antarctica is irresistible. You can listen to an excellent 2019 interview between Rignot and Radio Eco-shock for Antarctica.

According to researchers at the University of Washington in 201

4, Thwaites is already collapsing. "Simulations show that the start of the collapse in the initial stage has begun," their report notes. Moreover, the glacier Tavis is a "rope" for the rest of the Western Antarctic ice sheet; His rapid collapse "is likely to shift to neighboring catchments, undermining much of West Antarctica."

Glacier Tvates in 2019 a hard ice sheet just a few years ago, my excitement just coincided with my grief. 26 February, 2019

NASA's Jet Propulsion Laboratory made news last January @glacierthwaites pic.white.com/Dc0q0JqUGf

Elizabeth Rush (@ElizabethaRush) , revealing that there is a huge cavity cut at the bottom of the glacier due to the warmth of ocean water that causes alarm that the ice can collapse and break the shelf.

It is reported to have an area of ​​two-thirds of Manhattan and a tall ten-story building, 1000 feet. There were fourteen billion tons of ice in the newly discovered hole, and NASA noticed that the terrible melting and decay had not been there just three years ago. NASA's Icebridge program has made the discovery using ice penetrating radar through the deep glacier, as well as "constellation data from Italian and German synthetic-auteur radiolocats."

But it was just one of the horrors that found satellites, confirming fears that "Thwaites is not connected to the main rock."

Another changing feature is the Glacier Lightning Line – the place near the end of the continent, where it rises from the bed and begins to swim on the seawater. Many Antarctic glaciers stretch for miles beyond their ground lines, floating above the open ocean. used to hold. When this happens, the ground line retreats to the land. This puts more than the underside of the sea water glacier, increasing the likelihood that the melting speed will accelerate

For Tuyas: "We are discovering different mechanisms for withdrawal," Millilo said. Different processes in different parts of the long 100 mile (160 km) front of the glacier set the degree of withdrawal from the ground line and the loss of ice out of sync.

The vast cavity is under the main stem of the glacier on its western side – from the country farther from the Western Antarctic Peninsula. In this area, when the tide rises and falls, the landing line retracts and progresses through an area of ​​about 2 to 3 miles (3 to 5 kilometers). The glacier is detached from the ridge on the rock foundation at a constant velocity of 0.6 to 0.5 miles (0.6 to 0.8 kilometers) per year since 1992. Despite this stable landing speed, the melting speed on this side of the glacier is extremely high.

"From the eastern side of the glacier, the recess from the ground line passes through small channels, perhaps one kilometer wide, like fingers reaching the glacier to melt it beneath," Millilo said. In this region, the landing speed is doubled from about 0.6 kilometers per year from 1992 to 2011 to 0.8 miles (1.2 kilometers) per year from 2011 to 2017, this side of the glacier is lower than the western one.

With increased warming and rising sea levels, storms will become a whole new animal. I can not wrap my head around a storm like Sandy, which destroys Manhattan's infrastructure every five years until 2030.

Scientists have recently returned from a two-month trip aboard the glacier Natalie B. Palmer to the glacier Tayley. Jeff Goodell of Rolling Stone magazine was on board the research ship and has sent a lot of interesting shipments. On March 3, Bastian Quest, an oceanographer from the University of East Anglia, who is a key member of the ship's scientific team, got a WhatsApp message from a colleague back to the UK. She had sent him a satellite image of the Glacier glacier and the surrounding region of West Antarctica. By this time, we had just finished our close encounter with the majestic rocky blue glacier, and we were only a few miles away, depicting the sea bottom in front of the glacier with the sonar device of the ship.

is indispensable to help scientists track the constantly changing ice in the regions we are researching. But the card that Quest received this morning was different. He noticed dark cracks in portions of the ice shelf that sprang over the sea like a huge claw from the glacier itself. They had not been there before. The ice shelf was beginning to fall apart. Queste's first thought: "Oh shit."

Queste knew, and everyone else, the whole point of this study is to better understand the risk of collapse of the Thwaites glacier, one of the most significant critical points in the Earth's climate. system. Not only is Thwaites big, though it is (imagine a Florida-sized glacier). But because of the glacier ending in deep water, and the backward inclination of the ground beneath it, Tvess is vulnerable to a particularly rapid collapse. More worrying is that Tewkes is like a cork in the wine bottle for the rest of the Western Antarctic ice sheet. If Thwaites had to collapse, scientists are afraid that the entire ice layer may begin to collapse, ultimately raising the sea level to more than 10 feet.

Clip

[…] Within 48 hours, a melange of ice about 25 miles wide and 15 miles deep cracked and scattered in the sea. As Queste says, "A part of the glacier that is as big as the city I live in – I just did not."

In a separate message, Goodell wrote:

We marked 12 stamps with a high-tech tool that allows them to collect ocean data during diving and swimming; these labor-intensive gaskets already have over 10,000 dives and record nearly 700 reports of temperature, depth and salinity. We received two anchorages that contain important long-term oceanographic measurements. We've mapped hundreds of miles of previously uncharted seabed with sonar devices. We launched and restored submarine gliders to measure the temperature and salinity of the ocean. We performed three missions with Hugin, an automated underwater device that created many high-resolution sea-bottom maps in front of the Thwaites glacier. We looked at the old beaches on five distant islands, looking for evidence of past sea level rise in the region. And we poured out 27 sludges from the bottom of the Amundsen Sea.

It will take some time for scientists to analyze the data we have collected and say something final. But it is clear that some of our discoveries are remarkable, if not historic: We mapped an unexplored part of the Amundsen Sea, acquiring a key understanding of the seabed topography of the Thwaites, which will help scientists understand the flow of warm water under a glacier. Using high-resolution instruments at Hugin, we found traces at the bottom of the seabed, probably made of retreating glaciers, which will be a great help for researchers who are trying to determine when and if the Thwaites glacier collapsed in the recent past. And we gathered the first direct evidence of warm circulumpolar deep water that flows to Tvayts, as well as some hypotheses about the mechanism that drives it.

I learned a lot about climate scientists and the work I do. Like all of us, they are able to make mistakes, induce false assumptions, and interpret too much data. Money matters to them, but not to the way you think they deny the climate (all this is about funding research, not Aspen's ski apartments). I learned that some scholars can read sedimentary cores like a book, with every chapter full of new heroes involved in a mighty struggle to survive on our ever-changing planet. I have learned that science is not only a difficult and often dangerous work, but also that it is improvised, improvised and time-dependent. And that on a ship like Palmer the scientists are as good as the marine technicians and crew members who work with them. Most importantly, I learned that the best scientists are radical and fearless in ways that few outsiders can understand or appreciate. They are heroes of our time.

John Gertner of Wired Magazine writes:

Anandakrishnan stood up and went to a whiteboard to take a picture of the geometry of the glacier. It was a line that began with a bump in the front, where the glacier met with the sea and gently sloped downward as it went inside the country. At the moment, he said, it is unclear how long it has been for Thayates before pulling away from the boom – the ground line – and a rapid downturn begins. […] "It's kind of hanging on your nails right there," he explained, pointing to the bum.

Glaciers such as the Tails that end in the ocean tend to follow the familiar pattern of collapse. At first the water loosens the ice shelf from below, weakening and thinning it. Instead of sitting securely on the seabed, it begins to swim as a ship rising from the sand. This puts even more on the bottom of the water, and weakening and thinning continue. The policeman, which is already too fragile to maintain its own weight, begins to descend into the sea with huge pieces. More ice flows from the inside of the glacier, filling the lost, and the whole cycle begins again: it melts, slims, breaks, recedes;

It's hard to find a scientist, especially Anandakrishnan, who thinks that Tewyates can avoid this fate. Since her bed is below sea level, the water will haunt him in the interior. When the Tweets grounding line begins to retreat, perhaps over the next few decades, says Anandakrisnang, it can be quite fast. This retreat may first increase the sea level. From radar studies, scientists believe they have discovered another boom, now called the Ghost Ridge, which is about 45 miles behind the existing one. This is what Anandakrishna's spiritual team will follow with their seismic experiments on the surface. Is it made of wet sludge or is it solid and dry? Is it low or high? Such esoteric differences may have extraordinary effects. If any good news stems from his work in Tawes, says Anandakrishnan, it may come from the discovery that the glacier has a chance to stick firmly to the ghost hill. end of a rock. Just when it falls, it grabs a rock, a sturdy handle to avoid the abyss. Of course, the rock can be loosened and distracted tragically in its hands. And then it will fall.

We are not alone in experiencing the trauma of climate change:

Thanks for reading and vigil with me.


Source link