The website for Gary Braasch's book, co-authored with Lynne Cherry.
Glaciers and Glacial Warming: Arctic Last Updated on 2008-10-04 00:00:00Ice Under Fire: Arctic
Geophysicist Tom Osterkamp indicates ground level when he installed this temperature probe pipe near Denali Park, 15 years ago.
Alaska permafrost temperature has increased 0.5° to 1.5° C since 1980, when Osterkamp began measuring ground temperature at 30 sites. Many of those sites show thermokarsting like this. Serious effects include forest damage, sinking roads and buildings, eroding tundra riverbanks, changes in tundra vegetation, and increased carbon dioxide and methane emissions from thawed peat.
Just how serious a threat thawing tundra can be is being measured in Northern Sweden.
Rising atmospheric temperatures are causing the disappearance of permafrost and its replacement with marshland or open water. At Stordalen Mire near Abisko National Park, where careful records... More »
Glaciers and Glacial Warming: Mountain GlaciersLast Updated on 2008-10-04 00:00:00Ice Under Fire: Mountain Glaciers
Photographer Gary Braasch holding a 1932 photo of Broggi glacier near Huascaran in the Peruvian Andes, while rephotographing this receding glacier in 1999.
Glaciers everywhere in the world (with a very few exceptions) have been shrinking throughout the 20th Century, a prime signal of rapid global warming. Loss of tropical glaciers is particularly rapid. This glacier, previously photographed by the Austrian Hans Kinzl, receded about one kilometer in 67 years.
Here is a series of other receding glaciers in "then and now" views (move cursor over old image to see current glacier position).
Glacier Ururashraju, at about 15,000 feet in Cordillera Blanca of Peru. Photographed in 1986 by Peruvian glaciologist Alcides Ames, whose studies and direction allowed Gary Braasch to rephotograph it in 1999. Retreat of about... More »
Global Warming in Alaska and The ArcticLast Updated on 2008-09-11 00:00:00
The Arctic is thawing very rapidly, documented by new reports from scientists and arctic natives. The Arctic Climate Impact Assessment was released in late 2004, and shows changes from the ice at the North Pole to animals and human settlements. More recent reports from Greenland show outlet glaciers moving meters per hour and rapidly thinning. The Arctic Ocean ice cap is shrinking in summer to the smallest it has ever been in modern measurements, and even winter cold has not been refreezing it as extensively as before. That sea ice is habitat for the polar bear. Declines in bear nutrition, birth weight and survival have moved the U.S. government (urged by three environmental groups) to propose the bear be named a species threatened with extinction.
Arctic page. Also see Glaciers for more on Greenland and Alaska glaciers.
Pushing the... More »
Arctic GalleryLast Updated on 2008-04-19 17:03:30 Photos taken by Gary Braasch of the Arctic. More »