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Overview on glacier changes since the end of the Little Ice Age
Glaciers and ice caps reached their Holocene (the past 10 000 years) maximum extent in most mountain ranges throughout the world towards the end of the Little Ice Age, between the 17th and mid-19th century. Over the past...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Formation of lakes and glacier lake outburst floods (GLOFs) by Medvezhi Glacier, Pamirs
The increasing number of glacial and moraine lakes in Central Asian mountains is a matter of great concern. One of the surging glaciers that poses a potential threat is the 15 km long Medvezhi (Bear) Glacier in the Pamir...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Ice avalanches of the Nevados Huascarán in Peru
Many disasters have been recorded from the glaciers in the Cordillera Blanca. The 1962 and 1970 events originating from Glaciar 511 on the Nevados Huascarán, the highest peak of which is at 6768 m above sea level in the ...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Glaciers monitored through the World Glacier Monitoring Service
Worldwide collection of information about ongoing glacier changes was initiated in 1894 with the foundation of the International Glacier Commission at the 6th International Geological Congress in Zurich, Switzerland. Tod...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Caucasus ice-rock avalanche in Russian Republic of North Ossetia
An ice-rock avalanche in the Kazbek region sheared off almost the entire Kolka Glacier and devastated the Genaldon valley. The satellite images show the region before (July 22, 2001) and after (October 6, 2002) the ice-r...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Shrinking of Fedchenko Glacier in the Pamirs of Tajikistan
Significant loss of glaciers in Central Asia began around the 1930s, and become more dramatic in the second half of the 20th century and continue into the 21st century. Glacier area was reduced in the Tien Shan and in th...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Glacier shrinking on Cumberland Peninsula, Baffin Island, Canadian Arctic
A new glacier inventory based on satellite data shows that the glacier cover reduced by about 22 per cent between the Little Ice Age (LIA) maximum extent and 2000. Changes in glacier area and volume are being used as ind...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Caucasus ice-rock avalanche in Russian Republic of North Ossetia
An ice-rock avalanche in the Kazbek region sheared off almost the entire Kolka Glacier and devastated the Genaldon valley. The satellite images show the region before (July 22, 2001) and after (October 6, 2002) the ice-r...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Mass balance of the West Antarctic Ice Sheet
Increase in mass loss by the West Antarctic ice sheet. The mass loss has been steadily increasing since the 1970s as a result of accelerations in glacier flow; snowfall has not changed significantly in Antarctica over t...
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
South West Greenland Ocean Temperature
Initially, meltwater was assumed to be the prime cause of glacier acceleration, making its way to the ground beneath ice sheets, lubricating it and causing the glaciers to flow more quickly to the sea.
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Rapid decline of the San Quintin glacier, Northern Patagonia
Glaciers grow and retreat at intervals depending on changes in local climate, and local variations in temperature and precipitation play a particularly important role in this. Retreating and diminishing mountain glaciers...
22 Nov 2010 - by Viktor Novikov, Zoï Environment
Chacaltaya glacier
The retreat of glaciers is a clear indication of climate change in Latin America. Since the mid-1990s, the Chacaltaya glacier in the Plurinational State of Bolivia has lost half of its surface area and two thirds of its ...
22 Nov 2010 - by Nieves López Izquierdo, Associate Consultant UNEP/GRID-Arendal
Global glacier mass – annual variability and cumulative values
No data.
28 Mar 2006 - by Bounford.com and UNEP/GRID-Arendal
Glacier volume change forecasts
Oerlemans et al. (1998) conducted modelling experiments for a sample of 12 glaciers and ice caps, to determine volume changes under a range of temperature and precipitation forcings (Fig. 3). The range of glacier respon...
06 Dec 2010 - by Riccardo Pravettoni
Seasonal patterns of precipitation and runoff
The infuence of glaciers on seasonal distribution of river fow is strongly dependent on annual temperature and precipitation cycles, and the proportion of the catchment occupied by glacier ice. Figure 4 compares precip...
06 Dec 2010 - by Riccardo Pravettoni
Glacier recession and expansion in Hindu Kush-Himalayas and Central Asia
Averaged over their entire areas, within the period 1960– 2003 glaciers in Patagonia and Alaska have thinned by ap- proximately 35 m and 25 m, respectively, whereas high mountain glaciers in Asia have thinned by over...
06 Dec 2010 - by Riccardo Pravettoni
Salzach river discharge, Austrian Alps
Simulated contributions of glacier melt (frn/ice melt) to annual total runoff were calculated between 1 and 4%. In the period 1999–2000, when the glacier mass balance of Goldbergkees and Stubacher Sonnblickkees have been...
06 Dec 2010 - by Riccardo Pravettoni
Glacier shrinkage in hypothetical river basins
Downstream variation in the impact of glacier recession is illustrated in Figure 5, which shows modelled river fows for idealized catchments under climates representative of the western and eastern Himalaya and a 0....
06 Dec 2010 - by Riccardo Pravettoni
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