I would wait for peer review and experimental testing before considering gravity being that significant of an effect due to deglaciation. Not saying it isn't a consideration, but I believe he is overstating it. Like most any hypothesis, I think it may have holes in it. the gravity from a glacier is a weak force...
Me too. That article had a clarity others lack. That said, i thought surely we must have read much of that before. I wasn't even sure if i'd seen Jerry Mitrovica's name before. So.... yeah, of course we have. Damn, May 2017
Melting Glaciers Are Wreaking Havoc on Earth’s Crust
Sea levels are dropping, earthquakes and volcanoes are waking up, and even the earth’s axis is moving—all because of melting ice
A beach in Juneau, Alaska. Sea levels in Alaska are not rising, but dropping precipitously due to a phenomenon known as glacial isostatic adjustment. (Joseph, Flickr CC BY-SA)
How could this be? The answer lies in a phenomenon of melting glaciers and seesawing weight across the earth called “glacial isostatic adjustment.” You may not know it, but the Last Ice Age is still quietly transforming the Earth’s surface and affecting everything from the length of our days to the topography of our countries.
[...]
As prehistoric ice sheets began to melt around 11,700 years ago, however, all this changed. The surface began to spring back, allowing more space for the mantle to flow back in. That caused land that had previously been weighed down, like Glacier Bay Park in Alaska and the Hudson Bay in Canada, to rise up. The most dramatic examples of uplift are found in places like Russia, Iceland and Scandinavia, where the largest ice sheets existed. In Sweden, for example, scientists have found that the rising land severed an ancient lake called Malaren from the sea .. http://www.baltex-research.eu/publications/Books%20and%20articles/The%20Changing%20Level%20of%20the%20Baltic%20Sea.pdf , turning it into a freshwater lake.
At the same time, places that were once forebulges are now sinking, since they are no longer being pushed up by nearby ice sheets. For example, as Scotland rebounds, England sinks approximately seven-tenths of an inch into the North Sea each year. Similarly, as Canada rebounds about four inches each decade, the eastern coast of the U.S. sinks .. http://www.eenews.net/stories/1059972339 .. at a rate of approximately three-tenths of an inch each year—more than half the rate of current global sea level rise. A study published in 2015 .. http://www.geosociety.org/gsatoday/archive/25/8/abstract/i1052-5173-25-8-4.htm .. predicted that Washington, D.C. would drop by six or more inches in the next century due to forebulge collapse, which might put the nation’s monuments and military installations at risk.
Some of the most dramatic uplift is found in Iceland. (Martin De Lusenet, Flickr CC BY)
Recent estimates suggest that land in southeast Alaska is rising at a rate of 1.18 inches per year, a rate much faster than previously suspected. Residents already feel the dramatic impacts of this change. On the positive side, some families living on the coast have doubled or tripled their real estate: As coastal glaciers retreat and land once covered by ice undergoes isostatic rebound, lowland areas rise and create "new" land, which can be an unexpected boon for families living along the coast. One family was able to build a nine-hole golf course on land that has only recently popped out of the sea, a New York Times article reported in 2009 .. http://www.nytimes.com/2009/05/18/science/earth/18juneau.html?_r=0 . Scientists have also tracked the gravitational pull on Russell Island, Alaska, and discovered that it’s been weakening .. http://www.npr.org/templates/story/story.php?storyId=91894873 .. every year as the land moves farther from the Earth’s center.
[...]
As our gargantuan glaciers melted, the continents up north lost weight quickly, causing a rapid redistribution of weight. Recent research from NASA scientists show that this causes a phenomenon called “true polar wander” where the lopsided distribution of weight on the Earth causes the planet to tilt on its axis until it finds its balance .. http://earthsky.org/earth/earth-is-undergoing-true-polar-wander-scientists-say . Our north and south poles are moving towards the landmasses that are shrinking the fastest as the Earth’s center of rotation shifts. Previously, the North Pole was drifting towards Canada; but since 2000, it’s been drifting towards the U.K. and Europe at about four inches per year .. http://news.nationalgeographic.com/2016/04/160408-climate-change-shifts-earth-poles-water-loss/. Scientists haven’t had to change the actual geographic location of the North Pole yet, but that could change in a few decades.
Redistribution of mass is also slowing down the Earth’s rotation. In 2015, Harvard geophysicist Jerry Mitrovica published a study in Science Advances showing that glacial melt was causing ocean mass to pool around the Earth’s center, slowing down the Earth’s rotation. He likened the phenomenon .. http://www.climatecentral.org/news/glacial-melt-slowing-of-earths-rotation-19843 .. to a spinning figure skater extending their arms to slow themselves down.
Glacial melt may also be re-awakening dormant earthquakes and volcanoes. Large glaciers suppressed earthquakes, but according to a study published in 2008 .. http://news.nationalgeographic.com/news/2008/03/080314-warming-quakes.html .. in the journal Earth and Planetary Science Letters, as the Earth rebounds, the downward pressure on the plates is released and shaky pre-existing faults could reactivate. In Southeast Alaska, where uplift is most prevalent, the Pacific plate slides under the North American plate, causing a lot of strain .. http://www.geotimes.org/oct04/NN_glacier.html . Researchers say that glaciers had previously quelled that strain, but the rebound is allowing those plates to grind up against each other again. “The burden of the glaciers was keeping smaller earthquakes from releasing tectonic stress,” says Erik Ivins, a geophysicist at NASA’s Jet Propulsion Laboratory.
Melting glaciers may also make way for earthquakes in the middle of plates. One example of that phenomenon is the series of New Madrid earthquakes that rocked the Midwestern United States in the 1800s. While many earthquakes occur on fault lines where two separate plates slide on top of each other, scientists speculate that the earthquakes in the New Madrid area occurred at a place where hot, molten rock underneath the Earth’s crust once wanted to burst through, but was quelled by the weight of massive ice sheets. Now that the ice sheets have melted, however, the mantle is free to bubble up once again .. http://web.stanford.edu/dept/news/pr/01/glacier37.html .
For me, titles of articles .. This article of yours - Why Our Intuition About Sea-Level Rise Is Wrong .. is an excellent one. P - A geologist explains that climate change is not just about a global average sea rise. https://investorshub.advfn.com/boards/read_msg.aspx?message_id=164770616
really help. "I was aware of the gravity effect. I wasn't aware of how pronounced it was. That said, Florida is definitely fucked."
If i ever was i'd forgotten. Yep, seems Florida, for one, is definitely looking at huge change.
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