Earth’s Mantle Affects Sea Level Rise Estimates
2013 05 17
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
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
Department of Transportation Uses LRAD Sound Cannons Against Drivers
2014 04 16
The Missouri Department of Transportation revealed two newly acquired LRAD sound cannons this week, which will reportedly be used to target vehicles that speed in work zones.
Coming in at $25,000 a piece, the Long-Range Acoustic Device, a sonic weapon best know for its use against protesters and insurgents in Afghanistan, will alert drivers to road conditions by shooting a loud ...
An ’Unknown Holocaust’ and the Hijacking of History
2014 04 16
An address by Mark Weber, director of the Institute for Historical Review, delivered at an IHR meeting in Orange County, California, on July 25, 2009. (A report on the meeting is posted here.)
We hear a lot about terrible crimes committed by Germans during World War II, but we hear very little about crimes committed against Germans. Germany’s defeat in May ...
Ex-Mayor Bloomberg Starting $50 Million Gun-Control Network
2014 04 16
Former New York Mayor Michael Bloomberg ramped up his efforts to fight gun violence on Wednesday with a plan to spend $50 million on a grassroots network to organize voters on gun control.
The initiative’s political target is the powerful pro-gun lobby, including the National Rifle Association, that spends millions of dollars each year to back gun-rights supporters.
Bloomberg’s group, called Everytown ...
Nearly 300 missing after South Korean ferry sinks
2014 04 16
A ferry carrying 462 people, mostly high school students on an overnight trip to a tourist island, sank off South Korea’s southern coast on Wednesday, leaving more than 280 people missing despite a frantic, hours-long rescue by dozens of ships and helicopters. At least four people were confirmed dead and 55 injured.
The high number of people unaccounted for -- likely ...
Flash Points of Tyranny: It Doesn’t End With The Bundy Standoff
2014 04 15
To the discerning eye they are everywhere; Flashpoints of tyranny threatening to push the nation into open revolt. The standoff between the Bundy ranch and the BLM feds is a visceral example of growing discontent over an expanding federal government.
These abuses have occurred over many decades, with a focused intent. Centralization of power and a steady erosion of personal wealth ...
|More News » |