And now that we understand better how melt ponds form, and how much area they cover in the Arctic, efforts are being made to include more realistic sea-ice properties and pond parametrisation in climate models e. Holland et al. That way, we can study more precisely their impact on future climate, and the demise of the Arctic sea ice.
Arctic melt ponds form when meltwater clogs ice pores Science Daily. September Arctic sea-ice minimum predicted by spring melt-pond fraction Dr Michel Tsadamos personal webpage. Your email address will not be published. Search all blogs Search this blog only. She is a polar physical oceanographer primarily focussing on the transport of heat by global deep waters and their interaction with the cryosphere.
To study them she uses mostly global coupled models, but also goes at sea to collect new measurements. She tweets as ClnHz and blogs on PolarFever when at sea. Leave a Reply Cancel Reply Your email address will not be published.
Leave this field empty. The persistence of an already rare aquatic insect, the western glacier stonefly, is being imperiled by the loss of glaciers and increased stream temperatures due to climate warming in mountain ecosystems, according to a new study released in Freshwater Science. Photograph of the Juneau icefields of southeastern Alaska that contain more than glaciers which extend over 1, square miles 3, square km.
The iceberg has just broken free from under the water and shot to the surface, spinning towards the ice face. The ice cliff here is about 70 m Icebergs are calved as stress fractures in the glacier merge, eventually resulting in a piece of ice cracking off and falling into.
Note the icebergs in the ship's wake in the lower right side of the photograph. Skip to main content. Search Search. Climate and Land Use Change. Apply Filter. Which mountain in the conterminous U. Mount Rainier, Washington, at 14, feet 4, meters , the highest peak in the Cascade Range, is a dormant volcano whose glacier ice cover exceeds that of any other mountain in the conterminous United States.
Mount Rainier has approximately 26 glaciers. It contains more than five times the glacier area of all the other Cascade volcanoes How old is glacier ice?
The age of the oldest glacier ice in Antarctica may approach 1,, years old The age of the oldest glacier ice in Greenland is more than , years old The age of the oldest Alaskan glacier ice ever recovered from a basin between Mt. Bona and Mt. Churchill is about 30, years old. Glacier flow moves newly formed ice through the entire Are today's glaciers leftovers from the Pleistocene ice age? Yes and no. It depends on which glaciers you are considering. Parts of the Antarctic Continent have had continuous glacier cover for perhaps as long as 20 million years.
Other areas, such as valley glaciers of the Antarctic Peninsula and glaciers of the Transantarctic Mountains may date from the early Pleistocene. For Greenland, ice cores and Was all of Alaska covered by glaciers during the Pleistocene Ice Age? No--most of interior Alaska, south of the Brooks Range and north of the Alaska Range, was a non-glaciated grassland refuge habitat for a number of plant and animal species during the maximum Pleistocene glaciation. This ice-free corridor also provided one route for humans to move into North America.
Do ice worms exist? Yes, ice worms do, in fact, exist! They are small worms that live in glacial ice in Alaska, Washington, Oregon, and British Columbia; they have not been found in glaciers elsewhere. Contrary to stories and songs, they do not give glacier ice its blue color and they don't grow to lengths of 50 feet. These myths were made popular by poet Robert This is typically seen when poking a hole in the snow and looking down into the hole to see blue light, or in the blue color associated with the depths of crevasses in glaciers.
In each case the blue light is the product of a relatively long travel path through the snow or ice. This spectral selection is related to absorption, and not to reflection. The more icy and clear an iceberg, the bluer it appears. The larger grain sizes of bubbly ice allows deeper penetration of incident light and a reflected hue that can vary from blue-green to blue depending on the color of the surface which underlies the ice.
Yes, a little, because the ice crystals are larger. Crystals melt from the outside and large crystals expose less surface area per unit volume of ice; therefore, ice with larger crystals melts more slowly. Related pages: What color is water? A page from the "Causes of Color" exhibit Why are glaciers blue?
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