Climate change in earth s polar regions
This presentation is the property of its rightful owner.
Sponsored Links
1 / 12

Climate Change in Earth’s Polar Regions PowerPoint PPT Presentation


  • 59 Views
  • Uploaded on
  • Presentation posted in: General

Climate Change in Earth’s Polar Regions. Ben Holt Oceans-Ice Group Jet Propulsion Laboratory. Arctic Ocean, 1982. Global Temperature Change Enhanced at Poles. Average 2001-2007 Surface Temperature Change, Relative to the 1951-1980 Average ( ◦ C). Sunlight Reflectivity on Ice and Ocean.

Download Presentation

Climate Change in Earth’s Polar Regions

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Climate change in earth s polar regions

Climate Change in Earth’s Polar Regions

Ben Holt

Oceans-Ice Group

Jet Propulsion Laboratory

Arctic Ocean, 1982


Climate change in earth s polar regions

Global Temperature Change Enhanced at Poles

Average 2001-2007 Surface Temperature Change,

Relative to the 1951-1980 Average (◦C)


Climate change in earth s polar regions

Sunlight Reflectivity on Ice and Ocean

Sunlight

100 %

Sunlight

100 %

Reflected 85%

Reflected 7%

Ice / Snow

Absorbs 15%

Water

Absorbs 93%

•Increased warming => less ice => more open water

=> warmer water =>more ice melt and so on


Climate change in earth s polar regions

Arctic and Antarctic

Ice as key indicator of climate change

Barrow, Alaska

+30°F

South Pole

-80°F !!

/

Sea Ice (colored) and Land Ice (white)


Climate change in earth s polar regions

Arctic Sea Ice – Reduced Extent

September 19, 2010

Satellite Record

11.5 % Reduction Per Decade since 1979


Climate change in earth s polar regions

Arctic Sea Ice Thickness

Submarine and Satellite Record 1958-2007

•Sea ice thickness shows decadal thinning – over 40 %

Reference: Kwok & Rothrock, Geophysical Research Letters, 2009


Climate change in earth s polar regions

Land Ice

Glaciers, Greenland, Antarctica

~Water stored above sea level


Climate change in earth s polar regions

Greenland Ice Mass Loss 2002-2009

Derived From NASA GRACE Gravity Mission

Greenland

Change in Ice Mass Loss Gigatons

Velicogna, Geophysical Research Letters, 2009

•Contributes to sea level rise

J. Wahr, U. Colorado


Climate change in earth s polar regions

2009 NOAA Arctic Report Card

“Warming of the Arctic continues to be widespread,

and in some cases, dramatic.

Linkages between air, land, sea, and biology are evident.”


Climate change in earth s polar regions

Backup


Climate change in earth s polar regions

Evidence and Impact of Arctic Warming

•Sea ice – thinning (>40%) and shrinking (11.5% / decade)

•Permafrost melting – also releases methane

•Land ice melting – sea level change

•Loss of sea ice – impacts habitat of polar bears, walruses

•Ecosystem shifts – from Arctic to subarctic communities

•Increase human activities – shipping and oil production


Climate change in earth s polar regions

Sources, References

http://arctic.atmos.uiuc.edu/cryosphere/

http:www.giss.nasa.gov/research/news

http://nsidc.org

http://www.arctic.noaa.gov/reportcard/


  • Login