Thicker ice, which survives two or more years, now comprises just 10 percent of wintertime ice cover
, down from 30 to 40 percent.
Jeff Severinghaus, a paleoclimatologist at Scripps Institution of Oceanography who was not involved in the study, said in the statement: "We can now reject some of the lowest sea-level projections, because the models underpinning them assume continuous ice cover
during the last million years.
From a human perspective, changes in the sea ice cover
and resulting changes of important habitats have an impact on indigenous populations whose livelihoods are intertwined with the changing polar seasons and the existence of sea ice.
Although one region, the Weddell Sea, did have a significantly larger ice cover
In addition to our regular Ice Fishing Guide, which covers tactics and techniques to catch everything that swims under ice cover
, we're adding an exclusive issue that covers noteworthy new lures, tackle, and other ice paraphernalia critical to being effective and having fun on the ice.
With an innovative combination of synchronized records of GIS parameters, records of sea ice change and models ranging from global climate models to regional and process models, Ice2Ice will be the first concerted effort to tackle the question of the cause and future implications of past abrupt climate change in Greenland, the main hypothesis being that Arctic and sub-Arctic sea ice cover
is key to understand past and future Greenland temperature and ice sheet variations.
The layering reveals a historical record of ice cover
using "the same principle as using rings to determine a tree's age and the levels of precipitation," according to University of Toronto Mississauga's Jochen Halfar, lead author of a recent paper on the research published in the Proceedings of the National Academy of Sciences.
Water levels in the Great Lakes are expected to continue a steady recovery this year, courtesy of widespread ice cover
that is slowing evaporation and snowfall that has approached record amounts in some cities, federal experts said Wednesday.
Smith said that their study predicts that it will soon reverse its present trend and experience major drops in ice cover
in summer, which, along with decreased mixing of the vertical column, will extend the season of phytoplankton growth, asserting that these changes will substantially alter the area's pristine food web.
As of Thursday, ice cover
extended across 88 percent, according to the federal government's Great Lakes Environmental Research Laboratory in Ann Arbor.
Last year was the lowest recorded summer ice cover
in the Arctic.
Researchers from the University of Alaska at Fairbanks have identified 150,000 methane seeps in Alaska and Greenland in lakes along the margins of ice cover
, and scientists writing in Nature Geoscience warn that this ancient gas could have a significant impact on climate change.