Tag: Ice

Time series of freeze-up and break-up dates from selected Northern Hemisphere lakes and rivers, 1846–1995
Limited by the availability of detailed observations, most historical evaluations of changes in freshwater ice have focused on relatively simple characteristics, such as the timing of autumn freeze up and spring break up...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Distribution and current trend of polar bear subpopulations throughout the circumpolar Arctic
Polar bears occur in 19 relatively discrete subpopulations with an estimated worldwide abundance of 20,000– 25,000 animals. Our knowledge of the status and trend of each subpopulation varies due to availability, reliabil...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Arctic sea ice food web - schematic illustration
Sea ice represents a unique ecosystem in the Arctic, providing habitat to specialized iceassociated species that include microorganisms, fish, birds, and marine mammals. Individual species use sea ice in different ways d...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Ice coverage and primary production in the Arctic
Temperature changes may influence fish populations both directly, through shifts to areas with preferred temperature, and indirectly through the food supply and the occurrence of predators. The length of the ice-free per...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Location of datasets in the Arctic Species Trend Index (ASTI)
Dramatic changes, such as sea ice loss, are projected to occur in Arctic ecosystems over the next century. Understanding how the Arctic’s living resources, including its vertebrate species, are responding to these change...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Disappearing Arctic lakes - examples in Siberian lakes, 1973 to 1997
The Arctic contains a variety of types of lakes but overall, it is thermokarst lakes and ponds that are the most abundant and productive aquatic ecosystems in the Arctic. They are found extensively in the lowland regions...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Simulated projections for Polar cod distribution with global warming
Polar cod (Boreogadus saida) was found to be sensitive to the warming scenarios and the model predicted that it would be extirpated in most of its range even under the milder warming scenario. This is due to its occurren...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Arctic terrestrial species trends 1970-2005 (ASTI)
Dramatic changes, such as sea ice loss, are projected to occur in Arctic ecosystems over the next century. Understanding how the Arctic’s living resources, including its vertebrate species, are responding to these change...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Arctic genetic trends - lemming in Arctic Russia
Nucleotide diversity estimates based on the complete sequences of mitochondrial genome in the collared lemming indicate how past climate has structured the genetic component of biodiversity. Lower diversity in regions ...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Simulated projections for Polar cod distribution with global warming
Polar cod (Boreogadus saida) was found to be sensitive to the warming scenarios and the model predicted that it would be extirpated in most of its range even under the milder warming scenario. This is due to its occurren...
01 May 2010 - by Hugo Ahlenius, UNEP/GRID-Arendal
Distribution and current trend of polar bear subpopulations throughout the circumpolar Arctic
Polar bears occur in 19 relatively discrete subpopulations with an estimated worldwide abundance of 20,000– 25,000 animals. Our knowledge of the status and trend of each subpopulation varies due to availability, reliabil...
01 May 2010 - by Hugo Ahlenius, UNEP/GRID-Arendal
Towns and industrial activities in the Arctic
The Arctic is home to approximately 4 million people, with the share of indigenous and non-indigenous populations varying widely between the Arctic states. Larger settlements are usually located in resource-strategic pos...
13 Oct 2010 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Polar bear sub-populations and pollution
There are thought to be between 20,000 and 25,000 bears in the world, which occur in19 relatively discrete sub-populations, some of which are shared between nations. Topping the food chain in the Arctic, the polar bear i...
13 Oct 2010 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Marine mammals in the Arctic
Seven species of marine mammals live in the Arctic year-round – the bowhead whale, beluga whale, narwhal, ringed seal, beaded seal, walrus, and polar bear - and many more migrate to the Arctic seasonally. Many marine mam...
13 Oct 2010 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Projected changes in the Arctic climate, 2090
The averages of the scenarios in the Arctic Climate Impact Assessment (ACIA) are presented in this figure, for the year 2090, with the surface temperatures over land, the size of the polar ice cap, and the outer limits o...
13 Oct 2010 - by Hugo Ahlenius, UNEP/GRID-Arendal
Vegetation and land cover in the Arctic
The land mass in the Arctic - Greenland and parts of Canada, Alaska, Russia and the Nordic countries - surrounds the Arctic Ocean. In the low Arctic, down to the temperate regions, the taiga coniferous forests represents...
13 Oct 2010 - by Hugo Ahlenius, UNEP/GRID-Arendal
Arctic, topography and bathymetry (topographic map)
The Arctic represents the northermost area of the World, the Arctic Ocean and the land areas that surrounds it. The region is characterized but cold temperatures, and ice and snow. The summers are short, but with long pe...
01 Oct 2010 - by Hugo Ahlenius, UNEP/GRID-Arendal
Retreat of the snowcapped volcano of Santa Isabel, Colombia
Between 1959 and 1996, the snowcapped volcano of Santa Isabel in Colombia showed a 44% decrease in its ice-covered peak. This process of decrease in ice has continued, causing it to lose its attraction as a tourist site,...
22 Nov 2010 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Sea level rise caused by the melting of mountain and subpolar glaciers
Another process that results in rising sea levels is the addition of water mass from land ice. Melting glaciers and ice caps, as well as the vast ice sheets of Greenland and Antarctica, raise sea-levels if their water ma...
22 Nov 2010 - by Viktor Novikov, UNEP/GRID-Arendal
Changes to Coconut Beach (Dominica) after the 1995 hurricane season
During a period between May 1994 to September 1995 the profile of the beach dramatically changed. A rising sea level combined with more storms, washed away vulnerable beaches. With the sand gone, the coast is more vulner...
17 May 2005 - by Viktor Novikov, UNEP/GRID-Arendal
Previous | 1 2 3 4 5 6 7 8 9 10 11 | Next