For several days this month, Greenland's surface ice cover melted over a larger area than at any time in more than 30 years of satellite observations.

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Warm ocean currents cause majority of ice loss

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In the first comprehensive satellite study of its kind, a University of Colorado at Boulder-led team used NASA data to calculate how much Earth's melting land ice is adding to global sea level rise.

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Scientists with NASA's Operation IceBridge airborne research campaign began the mission's third year of surveys this week over the changing ice of Antarctica.

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The Arctic ice cap grows each winter as the sun sets for several months and shrinks each summer as the sun rises higher in the northern sky. Each year the Arctic sea ice reaches its annual minimum extent in September. It hit a record low in 2007.

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NASA-funded researchers have created the first complete map of the speed and direction of ice flow in Antarctica. The map, which shows glaciers flowing thousands of miles from the continent's deep interior to its coast, will be critical for tracking future sea-level increases from climate change. The team created the map using integrated radar observations from a consortium of international satellites.

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A NASA scientist and her colleagues were able to observe for the first time the power of an earthquake and tsunami to break off large icebergs a hemisphere away.

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An international team of researchers has combined data from multiple sources to provide the clearest account yet of how much glacial ice surges into the sea following the collapse of Antarctic ice shelves.

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Dr. Robert Bindschadler is a glaciologist at NASA's Goddard Space Flight Center in Greenbelt, Maryland and has been an active Antarctic field researcher for the past 30 years. He has led 15 field expeditions to Antarctica and has participated in many other expeditions to glaciers and ice caps around the world. He is currently involved in another field expedition to gather new measurements in the water underneath the floating fringe of the West Antarctic Ice Sheet.

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Scientists embark this week from Alaska on the second and final campaign of a NASA field campaign to study how changing conditions in the Arctic affect the ocean's chemistry and ecosystems.

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Scientists have previously shown that West Antarctica is losing ice, but how that ice is lost remained unclear. Now, using data from Earth observing satellites and airborne science missions, scientists are closing in on ice loss culprits above and below the ice.

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Scientists returned this week to the Southern Hemisphere where NASA's Operation IceBridge mission is set to begin its second year of airborne surveys over Antarctica. The mission monitors the region's changing sea ice, ice sheets and glaciers.

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Sea ice coverage dropped to 4.6 million square kilometers (1.78 million square miles) at its minimum, according to scientists at the National Snow and Ice Data Center. The extent was lower than the 2009 minimum but remained above the record minimums reached in 2007 and 2008.

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