Average Arctic Sea Ice Extent in September, 1973 to 1976
These figures show averages of Arctic sea ice extent for four Septembers, from 1973 to 1976. Credit: Don Cavalieri, NASA GSFC
Average Arctic Sea Ice Extent in September, 1999 to 2002
These figures show averages of Arctic sea ice extent for four Septembers, from 1999 to 2002. Credit: Don Cavalieri, NASA GSFC
A 30-year satellite record of sea ice in the two polar regions reveals that while the Northern Hemisphere Arctic ice has melted, Southern Hemisphere Antarctic ice has actually increased in more recent years. However, due to dramatic losses of Antarctic sea ice between 1973 and 1977, sea ice in both hemispheres has shrunk on average when examined over the 30-year time frame.
This study presents the longest continuous record of sea ice for both hemispheres based primarily on satellites, and the longer reading already begins to highlight some new information about sea ice trends over time, like the fact that more recently the Arctic has been losing ice at a faster rate.
"If you compare the rate of loss in the Arctic for the last two decades, it is 20 percent greater than the rate of loss over the last three decades," said Don Cavalieri, lead author of the study, and a senior researcher at NASA’s Goddard Space Flight Center. The study appeared in a recent issue of Geophysical Research Letters.
Krishna Ramanujan | GSFC
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A damming trend
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Researchers from the University of Basel have reported a new method that allows the physical state of just a few atoms or molecules within a network to be controlled. It is based on the spontaneous self-organization of molecules into extensive networks with pores about one nanometer in size. In the journal ‘small’, the physicists reported on their investigations, which could be of particular importance for the development of new storage devices.
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A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.
The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...
A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.
Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...
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18.12.2018 | Physics and Astronomy