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Collection: WWF Arctic Feedbacks Report

WWF Arctic Feedbacks ReportWWF Arctic Feedbacks Report
WWF Arctic Feedbacks Report
Mass balance of the West Antarctic Ice Sheet 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 the past 50 years.
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
3
South West Greenland Ocean Temperature 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
3
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
3
Radiation Radiation
Arctic sea ice and atmospheric circulation.
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
3
Methane in Air Above Water Surface Methane in Air Above Water Surface
Mixing ratio of methane in the air above the water surface measured along a ship’s route in September 2005. The dotted line shows the Latitude-specific monthly average of 1.85 parts per million by volume established for the Barrow, Alaska, USA, monitoring station at 71° 19’ N, 156° 35’ W (http://www. cmdl.noaa.gov/ccgg/insitu.html); this is the normal level of methane in the atmosphere at this latitude.
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
3
Mass balance of the Greenland Ice Sheet Mass balance of the Greenland Ice Sheet
Changes in mass of the Greenland Ice Sheet from 1958-2007.
27 Oct 2009 - by Laura Margueritte
5
Surface Temperature Degree Surface Temperature Degree
No data
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
3
Arctic Soil Organic Carbon Content Arctic Soil Organic Carbon Content
A new assessment has estimated that there are 1,650 gigatonnes of carbon stored in the northern circumpolar permafrost region4, more than twice the amount of carbon in the atmosphere.
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
2
Arctic Ocean surface Temperatures Arctic Ocean surface Temperatures
Consistent with the rapid retreat of sea ice, the surface waters of the Arctic Ocean have been warming in recent years, because declining sea-ice cover allows the water to absorb more heat from the sun.
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
4
Uptake of Carbon Dioxide from the Atmosphere Uptake of Carbon Dioxide from the Atmosphere
Atmosphere-ocean exchanges of carbon.
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
3
Modeled strength of the atlantic Meridional Overturning Circulation at 30° North Modeled strength of the atlantic Meridional Overturning Circulation at 30° North
MOC strength in a suite of coupled climate models.
27 Oct 2009 - by Laura Margueritte
4
Average sea level 1900-2009 Average sea level 1900-2009
Sea-level rise is accelerating.
27 Oct 2009 - by Laura Margueritte
4
Concentration Extent Concentration Extent
Reduced sea ice amplifies warming.
27 Oct 2009 - by Laura Margueritte
2
Surface Temperature Surface Temperature
At the regional, ocean basin scale, the area between the insulating sea-ice cover and the open ocean (known as the ice margin) is characterized by particularly strong temperature gradients during winter, favoring the development of low pressure systems along the edge of the ice, as well as smaller, intense features known as polar lows that present hazards to shipping.
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
3
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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