Earth’s Mantle Affects Sea Level Rise Estimates
2013-05-17 0:00

By Becky Oskin | OurAmazingPlanet



A prehistoric shoreline runs along the eastern edge of North America; scientists have pointed to it as evidence that much of Antarctica melted 3 million years ago. But new research suggests this shoreline is actually about 30 feet (10 meters) lower than previously thought, meaning less ice melted than suspected.

The shoreline, which should be flat, also swoops up and down the East Coast like a set of wave crests, reflecting tugging and pushing by Earth’s mantle, the layer of viscous rock leisurely oozing underneath the crust, according to the study, published today (May 16) in the journal Science Express.

The finding shows that scientists have to be careful when looking at Earth for evidence of past sea level changes from the planet’s cycles of glacial advance and retreat.

"You simply can’t go somewhere and look at the height of the shoreline and infer anything about the amount of water in the oceans or the height of sea level without already knowing an awful lot about what the mantle is doing," said David Rowley, lead study author and a geologist at the University of Chicago.


The East Coast shoreline as it appeared 3 million years ago. The shoreline has been adjusted 82 feet (25 meters) relative to today.

This interplay between the surface elevation of the Earth and the mantle is called dynamic topography. The cliffs of the Great Australian Bight and the tall height of the African continent are also attributed to the mantle’s effects on topography. Even the Appalachian Mountains may owe their enduring height to the mantle.

[...]

Read the full article at: news.yahoo.com




Related Articles
Sea levels "will continue rising regardless of greenhouse gas treaties", warn scientists
Sea Level Research (2010)
Rise of sea levels is "the greatest lie ever told"
New sat data shows Himalayan glaciers hardly melting at all
World misled over Himalayan glacier meltdown
Climate Paradox: Longer Antarctic Melt Season May Mean Less Global Warming?
Antarctica warmth ’unusual, but not unique’
Amount of ice in Bering Sea reaches all-time record
Arctic freshening not due to ice melt after all, says NASA


Latest News from our Front Page

The TPP, Monsanto, Rockefeller, Trilateral Commission, Brzezinski
2015-05-28 19:18
All hands on deck for global, economic, corporate dictatorship There are dots to connect here. They're real, and they're spectacular. Let me begin with a brief exchange from a 1978 interview, conducted by reporter Jeremiah Novak. He was speaking with two American members of the Trilateral Commission (TC), a group founded in 1973 by David Rockefeller and his intellectual flunkey, Zbigniew Brzezinski. NOVAK: ...
Video: Who Owns the Federal Reserve
2015-05-28 19:52
It's not like we don't have half a clue who actually "owns" the Federal Reserve, but we just wanted to know, superficially, who the Fed itself claims it is owned by (and, additionally, how the agency justifies its unchecked power). Apparently the agency never officially answers that question. See for yourself in the video above. Source: truthstreammedia.com
Monsanto's "Discredit Bureau" really does exist
2015-05-28 18:03
Reuters is reporting that Monsanto is demanding a sit-down with members of the World Health Organization (WHO) and the International Agency for Research on Cancer (IARC). This international scientific body is being called on the carpet for reporting that Monsanto’s most widely sold herbicide, which is inextricably linked to the majority of their genetically engineered products, is probably carcinogenic to ...
Amid Russia tensions, US nuclear bombers to conduct military drills in Sweden
2015-05-28 4:23
The Pentagon is planning to send nuclear bombers to Sweden for a military exercise next month amid growing tensions with Russia over the Ukraine crisis. The warplanes, the B-52 Stratofortress, will participate in a naval exercise on June 13, Swedish general Karl Engelbrektson said. They are set to fly from the United States nonstop and simulate a drop of anti-ship mines near ...
'Netanyahu to US: Give 50% more money, we'll shut up'
2015-05-28 4:55
Israeli Prime Minister Benjamin Netanyahu is asking the United States to provide Tel Aviv 50 percent more money for weapons and “we’ll shut up” on Iran nuclear talks, an author and investigative journalist in Philadelphia says. Dave Lindorff made the remarks in a phone interview with Press TV on Wednesday while commenting on a report which says Israel has asked Washington ...
More News »