In the northern hemisphere, ice sheets ebb and flow in 100,000-year cycles, driven by varying amounts of sunlight falling on Earth’s surface as its orbit and orientation toward the sun changes. But astronomical variations alone cannot explain why ice ages develop gradually but end quickly, in a few thousand years. Though the last ice age saw several peak-periods of sunlight, it was the last one—about 10,000 years ago—that caused the ice to withdraw from much of Europe and North America.
August 08, 2013
March 14, 2012
The seas are creeping higher as the planet warms, but scientists have not yet reached a consensus about how high they may go. Projections for the year 2100 range from inches to several feet, or more. The sub-tropical islands of Bermuda and the Bahamas contain important sites where researchers have gone looking for answers. By pinpointing where shorelines stood on cliffs and reefs there during an extremely warm period 400,000 years ago, they hope to narrow the range of global sea-level projections for the future.
September 15, 2011
The seas are rising, as they have during past periods of warming in earth’s history. Estimates of how high they will go in the next few thousand years range from five meters, putting greater Miami underwater, to 40 meters, wiping most of Florida off the map. “The range of estimates is huge to the point of meaninglessness,” says
, a climate scientist at Columbia University’s Lamont-Doherty Earth Observatory.
February 04, 2010
Scientists aboard the research ship the JOIDES Resolution recently drilled two kilometers into Earth’s crust, setting a new record for the deepest hole drilled through the seafloor on a single expedition.
July 27, 2009
A new study of sea level fluctuations over the last 22,000 years is the latest to predict that rising seas could reach close to one meter by the end of this century, consistent with the most recent sea level projections made by the Intergovernmental Panel on Climate Change (IPCC).
March 13, 2009
Warming Climate Drives Plankton and Penguins Poleward
Adélie penguins are flocking closer to the South Pole. A new study in the leading journal Science explains why: they’re following the food supply, which is moving southward with changing climate.
September 04, 2008
North American Ice Sheet Dwindled Fast in Conditions Like Today's
In the face of warming climate, researchers have yet to agree on how much and how quickly melting of the Greenland ice sheet may contribute to sea level rise.
|Basal Plumbing for the Changing (ice) Masses||Earth Science Colloquium|
|CO2, Sea Level, and Isostasy: Looking to the Past to Predict the Future||Earth Science Colloquium|
|Antarctica's Leaky Basement||Implications for Ice Sheet Dynamics, Paleoclimate Records and Microbiology|
|NOVA | Secrets Beneath the Ice||Featuring LDEO Scientist Robin Bell|
|The Ice Beneath Their Feet||Two Scientists, One Frigid Continent, and the Thrill of Discovery|
|Polar Regions||Polar Research at Lamont|
|Changes in the Arctic and Antarctic||Featuring LDEO scientist Robin Bell|
|A Slippery Slope?||The Water World Beneath the Changing Ice Sheets|