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Hydropower potential (theoretical possitibility for electricity generation) Hydropower potential (theoretical possitibility for electricity generation)
Hydropower, generating electricity through turbines, represents a clean and renewable energy source, but not without problems. Dams and reservoirs disrupt the natural flow, and may increase siltation and evaporation, in addition to severe impacts for wildlife, for instance migrating fish. The gross theoretical capability, presented in this map, represents a calculation based on the topography and precipitation in the countries, and is the amount ...
20 Jul 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
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Arctic map, political Arctic map, political
The Arctic is extremely diverse in terms of landscapes, varying from pack and drift ice to rugged shores, flat coastal plains, rolling hills and mountains surpassing 6000 metres above sea level (Denali, 6,194 m asl, in sub-arctic and boreal Alaska). The region has rivers and lakes, tundra and the largest forests in the world (the Russian Taiga). This is a simple grayscale political map.
11 Feb 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
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Arctic, topography and bathymetry (topographic map) Arctic, topography and bathymetry (topographic map)
The Arctic is extremely diverse in terms of landscapes, varying from pack and drift ice to rugged shores, flat coastal plains, rolling hills and mountains surpassing 6000 metres above sea level (Denali, 6,194 m asl, in sub-arctic and boreal Alaska). The region has rivers and lakes, tundra and the largest forests in the world (the Russian Taiga).
31 Jul 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
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Antarctic References Antarctic References
Images of Antarctica (left) and Greenland (right) to scale. Antarctica is 50 per cent larger than the United States or Europe. Greenland is 7 times smaller than Antarctica. There is enough ice in Antarctica to raise global sea level by 60 metres and 7 metres in Greenland.
27 Oct 2009 - by Laura Margueritte
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Global Sea-level Rise Global Sea-level Rise
The loss of ice from the Greenland Ice Sheet has increased and will contribute substantially to global sea level rise.
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Regional Variability in Sea-level Change Regional Variability in Sea-level Change
Regional variability in sea level change relative to the global average by the end of this century.
27 Oct 2009 - by Laura Margueritte
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Average sea level 1900-2009 Average sea level 1900-2009
Sea-level rise is accelerating.
27 Oct 2009 - by Laura Margueritte
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Regional Distribution of Sea-level Trends 1950-2003 Regional Distribution of Sea-level Trends 1950-2003
Satellite altimetry data has revealed that sea level is not rising uniformly.
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Sea level rise caused by the melting of mountain and subpolar glaciers 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 mass enters the ocean as melted water or icebergs (Pritchard et al. 2009, Steig et al. 2009, Velicogna 2009). Furthermore, it is estimated that melting of tropical glaciers (most of them are considered small) could cause an increas...
22 Nov 2010 - by Viktor Novikov, UNEP/GRID-Arendal
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Arctic, topography and bathymetry Arctic, topography and bathymetry
The Arctic is extremely diverse in terms of landscapes, varying from pack and drift ice to rugged shores, flat coastal plains, rolling hills and mountains surpassing 6000 metres above sea level (Denali, 6,194 m asl, in sub-arctic and boreal Alaska). The region has rivers and lakes, tundra and the largest forests in the world (the Russian Taiga).
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
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El Niño-Southern Oscillation (ENSO) Phenomenon El Niño-Southern Oscillation (ENSO) Phenomenon
El Niño describes 'the warm phase of a naturally occurring sea surface temperature oscillation in the tropical Pacific Ocean', and southern oscillation refers to 'a seesaw shift in surface air pressure at Darwin, Australia and the South Pacific Island of Tahiti'. This graphic explains the El Niño-Southern Oscillation Phenomenon, showing the differences between a normal year and an El Niño year.
17 May 2005 - by Delphine Digout, UNEP/GRID-Arendal
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ENSO impact on Southern Africa ENSO impact on Southern Africa
El Niño describes 'the warm phase of a naturally occurring sea surface temperature oscillation in the tropical Pacific Ocean', southern oscillation refers to 'a seesaw shift in surface air pressure at Darwin, Australia and the South Pacific Island of Tahiti' amd La Nina refers to the cooling phase of the same temperature oscillation that causes El Nino. This graphic shows how the El Nino phenomenon changed weather conditions in southern Africa in...
17 May 2005 - by Delphine Digout, UNEP/GRID-Arendal
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Nile Delta: Potential Impact of Sea Level Rise Nile Delta: Potential Impact of Sea Level Rise
The potential impacts of sea level rise on the Nile Delta are expected to include a decline in water quality that would affect freshwater fish, the flooding of agricultural land and damage to infrastructure. This graphic shows the Nile Delta region as it is today (2002), the area as it would appear with a 0.5 m sea level rise, and the area as it would appear with a 1.0 m sea level rise.
17 May 2005 - by Otto Simonett, UNEP/GRID-Arendal
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Time scales and sea level rise Time scales and sea level rise
No data.
28 Mar 2006 - by Bounford.com and UNEP/GRID-Arendal
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Arctic, topography and bathymetry Arctic, topography and bathymetry
The Arctic is extremely diverse in terms of landscapes, varying from pack and drift ice to rugged shores, flat coastal plains, rolling hills and mountains surpassing 6000 metres above sea level (Denali, 6,194 m asl, in sub-arctic and boreal Alaska). The region has rivers and lakes, tundra and the largest forests in the world (the Russian Taiga).
18 Aug 2006 - by Hugo Ahlenius, UNEP/GRID-Arendal
4
Arctic, topography and bathymetry Arctic, topography and bathymetry
The Arctic is extremely diverse in terms of landscapes, varying from pack and drift ice to rugged shores, flat coastal plains, rolling hills and mountains surpassing 6000 metres above sea level (Denali, 6,194 m asl, in sub-arctic and boreal Alaska). The region has rivers and lakes, tundra and the largest forests in the world (the Russian Taiga).
01 Jul 2006 - by Hugo Ahlenius, UNEP/GRID-Arendal
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Sea level rise and assessment of the state of the marine environment Sea level rise and assessment of the state of the marine environment
A significant sea level rise is one of the major anticipated consequences of climate change. This will cause some low-lying coastal areas to become completely submerged, while others will increasingly face short-lived high-water levels. These anticipated changes could have a major impact on the lives of coastal populations. The small island developing states (SIDS) will be especially vulnerable to the effects of sea level rise, and to changes in ...
01 Oct 2009 - by Philippe Rekacewicz
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Impact of sea level rise in Bangladesh Impact of sea level rise in Bangladesh
Impact of sea level rise in Bangladesh. three maps in a time relapse resulting in 18 million people affected, 22,000 km2 of land submerged by flooding.
26 Jan 2009 - by Phillipe Rekacewicz, February 2008
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Impact of sea level rise on the Nile delta Impact of sea level rise on the Nile delta
Impact of sea level rise on the Nile delta. Sea level elevation model used to produce impact of nile delta sea level rise.
26 Jan 2009 - by Phillipe Rekacewicz, Otto Simonett - February 2008
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