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2008 Arctic Sea Ice Concentration Map
03.18.08 -- Using the latest satellite observations from early 2008, NASA researchers and others report that the Arctic is still on 'thin ice' when it comes to the condition of sea ice cover in the region. This ice concentration map from March 9, 2008, shows maximum extent of sea ice in the Northern Hemisphere.
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Arctic Sea Ice Distribution by Age
03.18.08 -- The sea ice in the Arctic is much younger than normal, with vast regions now covered by first-year ice. The left image shows February distribution of ice by its age during normal Arctic conditions (1985-2000 average), and the right illustrates February 2008 Arctic ice age distribution.
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Algae Bloom in Antarctic Sea Ice
03.12.08 -- It was late summer 2007 in the Southern Hemisphere when NASA's Aqua satellite captured this image of Antarctica's Ross Sea (left). The image reveals a subtler sign of the growing season: The yellowish-green tinge of some of the sea ice is probably a bloom of algae.
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Mega-iceberg A53a, South Atlantic
03.05.08 -- Astronauts captured images of this massive iceberg from the International Space Station on Jan. 18, 2008. At the time, the iceberg was in the Atlantic Ocean some distance from Tierra Del Fuego in South America. Glaciologists think this iceberg is fast approaching the point of breaking up.
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Signs of Summer Thaw on the Antarctic Peninsula
02.06.08 -- The tip of the Antarctic Peninsula showed seasonal changes in late January 2008. Images captured on Jan. 24 and Jan. 30 by the Moderate Resolution Imaging Spectroradiometer on NASA's Terra satellite show a dramatic color shift, signs of the summer thaw.
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Retreat of the Tasman Glacier
01.25.08 -- The Tasman Glacier, New Zealand's longest, is one of 12 that may not recover from recent melting. In November 2007, New Zealand's government announced that ice volume in the country's Southern Alps had shrunk nearly 11 percent over the previous 30 years.
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Cloud Streets Across Caspian Sea
01.11.08 -- South of the loosely packed ice in the northern part of the sea, parallel rows of clouds line up along the north-south axis of the wind. These clouds form when cold air blows over the warmer, moister air that sits over the water.
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Pine Island Glacier, Antarctica
01.04.08 -- Satellite observations over the past few decades show that the Antarctic's Pine Island Glacier has lost elevation. This image of Pine Island Glacier from the Landsat Image Mosaic of Antarctica, otherwise known as LIMA, shows the glacier since a big calving event.
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Tyndall Glacier, Chile
12.27.07 -- This pair of satellite images of the Tyndall Glacier in Chile from 1990 and 2007 shows that the 32-km-long glacier has retreated significantly during the past 17 years. Tyndall Glacier has a total area of 331 square km.
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Two Decades of Temperature Change in Antarctica
11.21.07 -- Scientists from NASA's Goddard Space Flight Center have been working for several years to create and refine a satellite map of long-term temperature change in Antarctica. This image illustrates long-term changes in yearly surface temperature in and around Antarctica between 1981 and 2007.

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