Mileage Psycho Posted November 16, 2017 Share Posted November 16, 2017 Science. Quote These are the melting glaciers that might someday drown your city, according to NASA New York City has plenty to worry about from sea level rise. But according to a new study by NASA researchers, it should worry specifically about two major glacier systems in Greenland’s northeast and northwest — but not so much about other parts of the vast northern ice sheet. The research draws on a curious and counterintuitive insight that sea level researchers have emphasized in recent years: As ocean levels rise around the globe, they will not do so evenly. Rather, because of the enormous scale of the ice masses that are melting and feeding the oceans, there will be gravitational effects and even subtle effects on the crust and rotation of the Earth. This, in turn, will leave behind a particular “fingerprint” of sea level rise, depending on when and precisely which parts of Greenland or Antarctica collapse. Now, Eric Larour, Erik Ivins and Surendra Adhikari of NASA’s Jet Propulsion Laboratory have teased out one fascinating implication of this finding: Different cities should fear the collapse of different large glaciers. “It tells you what is the rate of increase of sea level in that city with respect to the rate of change of ice masses everywhere in the world,” Larour said of the new tool his team created. The research was published in Science Advances, accompanied by an online feature that allows you to choose from among 293 coastal cities and see how certain ice masses could affect them if the ice enters the ocean. The scientists also released a video that captures some of how it works. The upshot is that New York needs to worry about certain parts of Greenland collapsing, but not so much others. Sydney, however, needs to worry about the loss of particular sectors of Antarctica — the ones farther away from it — and not so much about the ones nearer. And so on. This is the case because sea level actually decreases near a large ice body that loses mass, because that mass no longer exerts the same gravitational pull on the ocean, which accordingly shifts farther away. This means that from a sea level rise perspective, one of the safest things is to live close to a large ice mass that is melting. “If you are close enough, then the effect of ice loss will be a sea level drop, not sea level rise,” said Adhikari. The effect is immediate across the globe. Indeed, the research shows that for cities like Oslo and Reykjavik, which are close to Greenland, a collapse of many of the ice sheet’s key sectors would lower, not raise, the local sea level. (These places have more to fear from ice loss in Antarctica, even though it is much farther away.) Here’s a figure from the researchers showing which parts of Greenland threaten New York the most. As you can see, the risk is mainly from the northern parts of Greenland and especially from the ice sheet’s northeast. This is revealing because while Greenland has hundreds of glaciers, three in particular are known to pose the greatest sea level risk because of their size and, if they collapse, how they could allow the ocean to reach deep into the remaining ice sheet, continually driving more ice loss. The three most threatening by far are Jakobshavn glacier on Greenland’s central western coast, Petermann glacier in its far northwest and Zachariae glacier in the far northeast. Zachariae is part of a massive feature known as the Northeast Greenland Ice Stream, which reaches all the way to the center of the ice sheet and through which fully 12 percent of Greenland’s total ice flows. The new research shows that Petermann, and especially the northeast ice stream, are a far bigger threat to New York than Jakobshavn is. In a high-end global warming scenario run out for 200 years, the study reported, Petermann glacier would cause 3.23 inches of globally averaged sea level rise, the northeast ice stream would cause 4.17 inches, and Jakobshavn would cause 1.73 inches. Of this total, New York would see two inches of rise from Petermann, 2.83 inches from the Northeast ice stream and just 0.6 inches from Jakobshavn. This all really matters because in the real world, glaciers are melting at very different rates. Jakobshavn is the biggest ice loser from Greenland and is beating a very rapid retreat at the moment. Zachariae is starting to lose ice and looking increasingly worrisome, but still nothing like Jakobshavn. Petermann is holding up the best, for now, though it has lost large parts of the floating ice shelf that stabilizes it and holds it in place. You will note that in no case does New York get the full effect of ice loss from any part of Greenland — it’s still far too close to the ice sheet. But Miami gets 95 percent of the globe’s total sea level rise from the northeast ice stream, while distant Rio de Janeiro gets 124 percent, or over five inches in the scenario above. The same goes for Antarctica — its melting, too, will have differential effects around the world. And that matters even more because the ice masses that could be lost are considerably larger than in Greenland. Antarctica, like Greenland, is melting at different rates. Substantial ice loss is already happening in west Antarctica and in the Antarctic peninsula. Meanwhile, although scientists are watching the far larger eastern Antarctica carefully, so far it’s not contributing nearly as much to sea level rise. Farther away — like, say, New York — Antarctic loss is a big deal. Research has shown that if west Antarctica collapses, the U.S. East Coast would see more than the average global sea level rise. The research represents a new departure in the science of sea level “fingerprinting,” said Riccardo Riva, a researcher who studies sea level at Delft University of Technology in the Netherlands, and who was not involved in the work. “So far, sea level fingerprints have been used in an ice-centered way, for instance to compute how a given amount of melt from a specific ice source will affect sea level change worldwide,” said Riva. “The authors are reversing the viewpoint, examining how much a certain location is affected by ice melt from different ice sources, and this provides a much better risk assessment by highlighting the ice sources that will have the largest impact.” Another scientist who commented on the study to the Post agreed that those involved in planning cities’ coastal defenses, or how they will adapt to future climate change, need to have not just sea level rise in mind, but specific glacier behavior. “The authors of this study have developed a tool to determine the sensitivity of sea level rise at specific coastal sites to melting from different sectors of the Greenland and Antarctic ice sheets,” said Natalya Gomez, a geoscientist at McGill University in Canada who studies sea level rise. “This tool will help to provide coastal planners with improved sea level projections as models and measurements of ice loss are refined.” The current research does not take into account all aspects of sea level rise. Shifting ocean currents can redistribute the mass of the oceans and change sea level, for instance, and as global warming progresses, it causes seawater to expand, and thus a steady rise in seas. Overall, though, the new study underscores a common theme of recent climate developments: We are now altering the Earth on such a massive scale that it puts us at the mercy of fundamental laws of physics as they mete out the consequences. https://www.msn.com/en-us/news/other/these-are-the-melting-glaciers-that-might-someday-drown-your-city-according-to-nasa/ar-BBF0rJw Quote Link to comment Share on other sites More sharing options...
Snake Posted November 16, 2017 Share Posted November 16, 2017 10 years ago NASA said the Arctic would be ice free in the summer. How'd that work out Vin? 1 Quote Link to comment Share on other sites More sharing options...
s pump Posted November 16, 2017 Share Posted November 16, 2017 (edited) In the last glaciation, the Northern hemisphere was about half covered with ice. A large part of it over a mile thick . Sea levels were 120 meters lower and continental shelf with 90 miles offshore of today's Shoreline. So you're worried about that last little bit of ice that's left ruining the world? Read up a little bit Vinny, you're starting to sound like Coach. https://www.google.com/amp/slideplayer.com/amp/4529153/ Edited November 16, 2017 by s pump Quote Link to comment Share on other sites More sharing options...
Zambroski Posted November 16, 2017 Share Posted November 16, 2017 Sweet fucking glaciers! Ughhh..... "The icerbergs are coming!!! THE ICEBERGS ARE COMING!!!!! .....RUSSIA!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!" "Settled". Quote Link to comment Share on other sites More sharing options...
snoughnut Posted November 16, 2017 Share Posted November 16, 2017 Poor Vince, gut hooked by "science", it must be true it's "science". Unfortunately when it comes to climate change, "science" has developed quite a crooked agenda. Quote Link to comment Share on other sites More sharing options...
Edmo Posted November 16, 2017 Share Posted November 16, 2017 Just now, snoughnut said: Poor Vince, gut hooked by "science", it must be true it's "science". Unfortunately when it comes to climate change, "science" has developed quite a crooked agenda. The sky has been falling since I was a kid. And they still prop up these doom and gloom predictions as facts. It’s fucking comical. One born every minute. 1 Quote Link to comment Share on other sites More sharing options...
Rod Posted November 16, 2017 Share Posted November 16, 2017 I won't believe it until I hear it from al gore. He always nails it Quote Link to comment Share on other sites More sharing options...
XCR1250 Posted November 16, 2017 Share Posted November 16, 2017 1 minute ago, Rod Johnson said: I won't believe it until I hear it from al gore. He always nails it Well he did invent the internet. Quote Link to comment Share on other sites More sharing options...
Zambroski Posted November 16, 2017 Share Posted November 16, 2017 This could all be stopped and mankind could be saved if Trump wouldn't have pulled out of the Paris Accord!!!! Quote Link to comment Share on other sites More sharing options...
Mainecat Posted November 16, 2017 Share Posted November 16, 2017 Vince got a new wingnut dog whistle Quote Link to comment Share on other sites More sharing options...
Platinum Contributing Member Jimmy Snacks Posted November 16, 2017 Platinum Contributing Member Share Posted November 16, 2017 15 minutes ago, Mainecat said: Vince got a new wingnut dog whistle And you just got a New depends slapped on your wrinkled poopy ass...what’s your point? Quote Link to comment Share on other sites More sharing options...
Carlos Danger Posted November 16, 2017 Share Posted November 16, 2017 Even if Chicago ends up under water it will still be the murder capital of the country. Quote Link to comment Share on other sites More sharing options...
Gold Member BOHICA Posted November 16, 2017 Gold Member Share Posted November 16, 2017 Looks like we need border fences to fence off the coast lines to keep the flood prone immigrants away from the America that doesn’t flood and fuck it up for the those of us that live in the non glacial melt flood prone areas Quote Link to comment Share on other sites More sharing options...
Mainecat Posted November 16, 2017 Share Posted November 16, 2017 17 minutes ago, Jimmy Snacks said: And you just got a New depends slapped on your wrinkled poopy ass...what’s your point? I was right. Quote Link to comment Share on other sites More sharing options...
Platinum Contributing Member Highmark Posted November 16, 2017 Platinum Contributing Member Share Posted November 16, 2017 (edited) What will they "come up with" next. We've been hearing for some time about record ice in Antarctica. We have another "issue" to study. Give us more money so we have jobs. The same goes for Antarctica — its melting, too, will have differential effects around the world. Edited November 16, 2017 by Highmark Quote Link to comment Share on other sites More sharing options...
Rw06GT Posted November 16, 2017 Share Posted November 16, 2017 These threads just aren't the same unless Kneel replies. Come on in and dazzle us with your dizzying intellect fence rider! Quote Link to comment Share on other sites More sharing options...
Platinum Contributing Member Highmark Posted November 16, 2017 Platinum Contributing Member Share Posted November 16, 2017 Sweet Jesus they haven't ever predicted much of anything correct concerning GW and now they are predicting sea level rise to the hundredths of an inch. In a high-end global warming scenario run out for 200 years, the study reported, Petermann glacier would cause 3.23 inches of globally averaged sea level rise, the northeast ice stream would cause 4.17 inches, and Jakobshavn would cause 1.73 inches. Of this total, New York would see two inches of rise from Petermann, 2.83 inches from the Northeast ice stream and just 0.6 inches from Jakobshavn. Quote Link to comment Share on other sites More sharing options...
JEFF Posted November 16, 2017 Share Posted November 16, 2017 When science uses the word "might" in a title it's gotta be true. Fuckin guthooked libs.... Quote Link to comment Share on other sites More sharing options...
bussman Posted November 17, 2017 Share Posted November 17, 2017 Once the poles shift this will look like child’s play. Quote Link to comment Share on other sites More sharing options...
Rod Posted November 17, 2017 Share Posted November 17, 2017 9 hours ago, Mainecat said: I was right. You had a boom boom? Quote Link to comment Share on other sites More sharing options...
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