The glaciers on Greenland are melting, and this is releasing visible plumes of sediments to surrounding waters. NASA has released some new images showing these plumes.
Toward the end of the 21st century, melting from the Greenland Ice Sheet could result in global sea level rise of 4-21 centimeters (2-8 inches), according to the Fifth Assessment Report from the Intergovernmental Panel on Climate Change. Toward refining that estimate, some scientists are taking a close look at the colorful plumes that pepper the ocean around Greenland's perimeter.
About half of the mass lost from the Greenland Ice Sheet is from icebergs calving from glaciers; the other half is lost via meltwater runoff either from the top of the ice or from below (subglacial). According to Vena Chu of University of California, Los Angeles, one of the biggest science questions relating to the ice sheet is: what is the contribution to sea level rise from meltwater?
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It's official: California is now the first state in the country to institute a statewide plastic bag ban! Though it took years for state legislators to pass this bill plus an additional month that felt like an eternity for the governor to sign the bill into law, environmentalists can finally rejoice in the knowledge that grocery store plastic bags will soon be a thing of the past. Analysts expect the legislation will eliminate at least 13 billion plastic bags per year. Don't expect to see a change immediately, however: the ban won't go into effect until next July. Liquor and convenience stores will have until July of 2016 to switch to paper or reusable bags.
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Nowadays, when there's a killer heat wave or serious drought somewhere, people wonder: Is this climate change at work? It's a question scientists have struggled with for years. And now there's a new field of research that's providing some answers. It's called "attribution science" — a set of principles that allow scientists to determine when it's a change in climate that's altering weather events ... and when it isn't.
The principles start with the premise that, as almost all climate scientists expect, there will be more "extreme" weather events if the planet warms up much more: heat waves, droughts, huge storms.
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A mass of thousands of walruses were spotted hauled up on land in northwest Alaska during NOAA aerial surveys earlier this week. An estimated 35,000 occupied a single beach – a record number illustrating a trend in an unnatural behavior scientists say is due to global warming. Walruses (Odobenus rosmarus)—iconic arctic mammals that are only distantly related to seals—traditionally use sea ice to rest, breed, and give birth, and as a vantage from which to spot mollusks and other food sources. However, as their habitat warms and sea ice melts, walruses are forced to come to land more often and in greater numbers.
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New data obtained by NASA's GRAIL mission reveals that the Procellarum region on the near side of the moon - a giant basin often referred to as the "man in the moon" - likely arose not from a massive asteroid strike, but from a large plume of magma deep within the moon's interior.
The Procellarum region is a roughly circular, volcanic terrain some 1,800 miles in diameter - nearly as wide as the United States. One hypothesis suggested that it was formed by a massive impact, in which case it would have been the largest impact basin on the moon. Subsequent asteroid collisions overprinted the region with smaller - although still large - basins.
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A new study published Sunday in Nature Geoscience documents that the source of fresher Nordic Seas since 1950 is rooted in the saline Atlantic as opposed to Arctic freshwater that is the common inference. This is an important finding as it shows that the Gulf Stream is not about to short circuit. A halting Gulf Stream has been a concern with ongoing climate change; its collapse was taken to the extreme in the Hollywood blockbuster "The Day After Tomorrow", says Tor Eldevik, professor in oceanography at the University of Bergen and the Bjerknes Centre.
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