CRYOSPHERE CHANGES These slides show photographs and images so that you can learn about how the cryosphere is being affected by climate change today. You.

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Presentation transcript:

CRYOSPHERE CHANGES These slides show photographs and images so that you can learn about how the cryosphere is being affected by climate change today. You can refresh your knowledge of what is meant by the ‘cryosphere’ by visiting the Discovering The Arctic website: at.html at.html

Collapse of West Antarctic ice shelves: Larsen B, bigger than the US state of Rhode Island (or Cornwall), disintegrated in mparison.pnghttp://commons.wikimedia.org/wiki/File:Larsen_B_Collapse_Size_Co mparison.png Robert A. Rohde See the next slide for the former location of this ice shelf. Satellite image

NASA satellite infrared sensor data: this shows the pattern of warming across the snow, ice, and sea surfaces in the Antarctic region from 1981 to d_ jpg

20 th century global average temperature rise of about 0.7ºC. In parts of West Antarctica and the Arctic, temperature has risen by over 3°C in the last 50 years. e-iconic-graphs-showing-the-climate-fix-were-in/ The ‘0’ here refers to the average temperature over the time of recordings.

Each year Arctic sea ice reaches its lowest extent in September (by end of the summer). Notice how this trend compares with the temperature trend in the previous slide.

The white area of the map shows Arctic sea ice extent in September The magenta line around it shows the 1981 to 2010 median. Patrick Kelley Photo showing break up of sea ice. North Pole Greenland ice sheet

In addition to becoming less extensive, Arctic sea ice has become thinner and will continue to thin this century. elang=en-gb NOAA image

View of Mont Blanc, near Chamonix, France. Since AD 1850 the total area of the Alps covered by glacier ice has halved. _0068.JPGhttp://commons.wikimedia.org/wiki/Chamonix#mediaviewer/File:Mont_Blanc_100 _0068.JPG (Daniel D.)

comparison: Grinnell Glacier, Montana, USA. Melting glacier images jpg?uselang=en-gbhttp://commons.wikimedia.org/wiki/File:Grinnell_Glacier_ jpg?uselang=en-gb (T.J.Hileman 1938, Lindsey Bengtson 2009)

Retreat of the calving edge of the Jakobshaven outlet glacier, Greenland, between 1851 and Melting glacier images NASA image The sea is on this side. Interior of Greenland is on this side jpg?uselang=en-gb

comparison: Glacier Bay National Park and Reserve's White Thunder Ridge (Alaska) as seen on August 13, 1941 (left) and August 31, 2004 (right). Muir Glacier has retreated out of the field of view, Riggs Glacier has thinned and retreated significantly, and dense new vegetation has appeared. Muir Glacier was more than 2,000 feet thick in USGS photo by B. F. Molnia; 1941 photo by W. O. Field. Melting glacier images

Kenai Fjords National Park, Alaska. This glacier still exists but has retreated 20 km back from the 1909 position and is out of view in the 2004 photo. Melting glacier images Ulysses S. Grant 1909, Bruce Molnia, 2004)

comparison: Over 80% of the ice and snow on Mount Kilimanjaro, Tanzania, has disappeared over the past century, much of it in the past few decades (NASA Landsat 5 images). Melting glacier images _Ice_on_Kilimanjaro-1993.jpg?uselang=en-gb _Ice_on_Kilimanjaro-2000.jpg?uselang=en-gb

This map shows changes to glacier mass balance in mountain regions between 1970 and Notice the anomaly of Scandinavia which has some glaciers that thickened during the time period of measurement. pnghttp://commons.wikimedia.org/wiki/File:Glacier_Mass_Balance_Map. png (Robert A. Rohde) New Zealand 83% of the surveyed glaciers showed thinning.

jpg?uselang=en-gbhttp://commons.wikimedia.org/wiki/File:AntarcticaTemps_ jpg?uselang=en-gb NASA image Notice from the colour difference how West Antarctica is being affected by more warming than East Antarctica. Much of East Antarctica has experienced little, if any, change. Map of temperature rise across Antarctica from 1957 to West Antarctic ice sheet East Antarctic ice sheet

Some clues for understanding why the West Antarctic ice sheet is more sensitive to climate change than the East Antarctic ice sheet The East Antarctic Ice Sheet (EAIS) has about 9 times the volume of the West Antarctic Ice Sheet (WAIS) The EAIS has an average thickness of 2,226 metres compared with the WAIS maximum of 1,306 metres. The EAIS reaches a higher elevation above sea level (over 4,000 metres) than the WAIS. In contrast with East Antarctica, the WAIS sits on bedrock that is mostly below sea level.