Tag: Ice

Ice cover on the North Caspian
Ice cover changes in 70 years period on the North Caspian.
07 Mar 2012 - by Original cartography by Philippe Rekacewicz (le Monde Diplomatique) assisted by Laura Margueritte and Cecile Marin, later updated by Riccardo Pravettoni (GRID-Arendal), Novikov, Viktor (Zoi Environment Network)"
Jakobshavn Isbrae and ice fjord, showing locations of the calving ice front in years from 1851 to 2006, together with flow velocity observations
The glacier extends through the Illulisat Icefjord, surrounded by mountains. Icebergs calve off from the main glacier, pile up and block the fjord before being released into Qeqertarsuup Tunua (Disko) Bay and Davis Strai...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Maps of average sea ice extent in the Arctic summer (September) and winter (March), and in the Antarctic summer (February) and winter (September)
Passive microwave sensors on satellites have monitored the extent of the sea ice cover since 19782. This technique is widely used to investigate fluctuations in ice extent over the seasons, variability between years, and...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Estimates of people flooded in coastal areas in the 2080s as a result of sea-level rise and for given socio-economic scenarios and protection responses
The lines represent IPCC Special Report on Emissions Scenarios (SRES) based on different world views. The differences in impacts between the SRES scenarios for the same amount of sea-level rise and protection response re...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Climate feedbacks - the connectivity of the positive ice/snow albedo feedback, terrestrial snow and vegetation feedbacks and the negative cloud/radiation feedback
Feedback refers to the modification of a process by changes resulting from the process itself. Positive feedbacks accelerate the process, while negative feedbacks slow it down. Part of the uncertainty around future clima...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Uptake of Carbon Dioxide from the Atmosphere
Arctic marine systems currently provide a substantial carbon sink but the continuation of this service depends critically on arctic climate change impacts on ice, freshwater inputs, and ocean acidification.
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Minimum arctic summer sea ice extent
Sea ice has decreased sharply in all seasons, with summer sea ice declining most dramatically — beyond the projections of IPCC 2007.
27 Oct 2009 - by Laura Margueritte
Trends in permafrost temperatures in the central and northern Mackenzie Valley, 1984-2006
Temperature monitoring in Canada indicates a warming of shallow permafrost over the last two to three decades. Since the mid-1980s, shallow permafrost (upper 20-30 m) has generally warmed in the Mackenzie Valley. The gre...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
World ocean thermohaline circulation (alternative version)
The global conveyor belt thermohaline circulation is driven primarily by the formation and sinking of deep water (from around 1500m to the Antarctic bottom water overlying the bottom of the ocean) in the Norwegian Sea. W...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Historical trends in carbon dioxide concentrations and temperature, on a geological and recent time scale
The most recent geological history, in the last hundred thousand years, has been characterised by cycles of glaciations, or ice ages. The historic temperatures, through these times, have been low, and continental ice she...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Major glacier hazard locations
Major glacier hazard locations
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Arctic sea ice minimum extent in September 1982, 2005 and 2007
The red line indicates the median minimum extent of the ice cover for the period 1979–2000. This figure compares the Arctic sea ice extent in September for the years 1982 (the record maximum since 1979), 2005 and 2007 (t...
18 Apr 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Increases in annual temperatures for a recent five-year period, relative to 1951-1980
Warming is widespread, generally greater over land than over oceans, and the largest gains in temperatures for the planet are over the North American Arctic, north central Siberia, and on the Antarctic Peninsula. These r...
18 Apr 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Ringed seal pupping lair, with the pup in the lair and the female approaching the haul-out hole from the water
Ringed seals are the 'classic' Arctic seal in many regards, being found as far north as the Pole because of their ability to keep breathing holes open in ice that can reach 2 metres in depth. This species is certainly on...
01 Nov 2007 - by Robert Barnes, UNEP/GRID-Arendal
Greenland, showing rates of surface-elevation change between the late 1990s and 2003
Mass-balance estimates for Greenland show thickening at high elevations since the early 1990s at rates that increased to about 4 cm per year after 2000, consistent with expectations of increasing snowfall in a warming cl...
18 Apr 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Ocean currents and sea ice extent
Arctic Ocean circulate in a large clockwise rotational pattern moving from east to west around the polar ice cap. This rotating pattern, known as a gyre, occurs as a result of the clockwise winds that typically occur in ...
04 Oct 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Melting snow on Kilimanjaro
At the February 2001 meeting of the American Association for the Advancement of Science (AAAS), researchers reported dramatic changes in the volume of ice capping the Kibo summit of Kilimanjaro.This graphic shows the est...
17 May 2005 - by Delphine Digout, UNEP/GRID-Arendal
Ice thickness change vs elevation (Patagonia glaciers)
Thickness, in relation to elevation, for two different ice fields located in very Southern South America (Patagonian ice fields), with 1975-2000 averages and 1995-2000 average, which show dramatic decrease.
17 May 2005 - by Viktor Novikov, UNEP/GRID-Arendal
Quick retreat of the Santa Rosa glacier, Peru
Several mountain glaciers now disappear at a frightening rate as in the Santa Rosa glacier of Peru. A warmer climate often leads to increased precipitation. Much of the increased precipitation comes as rain instead of s...
17 May 2005 - by GRID-Arendal
Retreat of the ice cap on the Volcano Nevado Santa Isabel (Colombia)
Shows the retreat of the glacier on the volcano Nevado Santa Isabel and the correlation of global warming. With spectacular mountain peak glaciers melting away, the area becomes less attractive to tourists. In addition,...
17 May 2005 - by GRID-Arendal
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