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NASA: Strange and sudden ice melt in Greenland
WASHINGTON – Nearly all of Greenland's massive ice sheet suddenly started melting a bit this month, a freak event that surprised scientists.
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NASA images show the extent of surface melt over Greenland's ice sheet on July 8, left, and July 12, right. Nearly every part of the massive Greenland ice sheet suddenly and strangely melted a bit this month in a freak event that scientists had never witnessed before. NASA says three different satellites saw what it calls unprecedented melting from July 8 to July 12.
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AP
NASA images show the extent of surface melt over Greenland's ice sheet on July 8, left, and July 12, right. Nearly every part of the massive Greenland ice sheet suddenly and strangely melted a bit this month in a freak event that scientists had never witnessed before. NASA says three different satellites saw what it calls unprecedented melting from July 8 to July 12.
Sponsored LinksEven Greenland's coldest and highest place, Summit station, showed melting. Ice core records show that last happened in 1889 and occurs about once every 150 years.
Three satellites show what NASA calls unprecedented melting of the ice sheet that blankets the island, starting on July 8 and lasting four days. Most of the thick ice remains. While some ice usually melts during the summer, what was unusual was that the melting happened in a flash and over a widespread area.
"You literally had this wave of warm air wash over the Greenland ice sheet and melt it," NASA ice scientist Tom Wagner said Tuesday.
The ice melt area went from 40 percent of the ice sheet to 97 percent in four days, according to NASA. Until now, the most extensive melt seen by satellites in the past three decades was about 55 percent.
Wagner said researchers don't know how much of Greenland's ice melted, but it seems to be freezing again.
"When we see melt in places that we haven't seen before, at least in a long period of time, it makes you sit up and ask what's happening?" NASA chief scientist Waleed Abdalati said. It's a big signal, the meaning of which we're going to sort out for years to come."
About the same time, a giant iceberg broke off from the Petermann Glacier in northern Greenland. And the National Snow and Ice Data Center on Tuesday announced that the area filled with Arctic sea ice continues near a record low.
Wagner and other scientists said because this Greenland-wide melting has happened before they can't yet determine if this is a natural rare event or one triggered by man-made global warming. But they do know that the edges of Greenland's ice sheets have already been thinning because of climate change.
Summer in Greenland has been freakishly warm so far. That's because of frequent high-pressure systems that have parked over the island, bringing warm, clear weather that melts ice and snow, explained University of Georgia climatologist Thomas Mote.
He and others say it's similar to the high-pressure systems that have parked over the American Midwest bringing record-breaking warmth and drought.
Ohio State University ice scientist Jason Box, who returned Tuesday from a three-week visit, said he ditched his cold weather gear for the cotton pants that he normally dons in Nevada.
"It was sunny and warm and all the locals were talking about how sunny it was," Box said after getting off a plane. "Beyond T-shirt weather."
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
http://www.usatoday.com/weather/climate/story/2012-07-25/greenland-ice-sheet-melt-climate-change/56479518/1
Find a Forecast
Find your local weather with The Weather Channel zip-code lookup:
AP
NASA images show the extent of surface melt over Greenland's ice sheet on July 8, left, and July 12, right. Nearly every part of the massive Greenland ice sheet suddenly and strangely melted a bit this month in a freak event that scientists had never witnessed before. NASA says three different satellites saw what it calls unprecedented melting from July 8 to July 12.
EnlargeClose
AP
NASA images show the extent of surface melt over Greenland's ice sheet on July 8, left, and July 12, right. Nearly every part of the massive Greenland ice sheet suddenly and strangely melted a bit this month in a freak event that scientists had never witnessed before. NASA says three different satellites saw what it calls unprecedented melting from July 8 to July 12.
Sponsored LinksEven Greenland's coldest and highest place, Summit station, showed melting. Ice core records show that last happened in 1889 and occurs about once every 150 years.
Three satellites show what NASA calls unprecedented melting of the ice sheet that blankets the island, starting on July 8 and lasting four days. Most of the thick ice remains. While some ice usually melts during the summer, what was unusual was that the melting happened in a flash and over a widespread area.
"You literally had this wave of warm air wash over the Greenland ice sheet and melt it," NASA ice scientist Tom Wagner said Tuesday.
The ice melt area went from 40 percent of the ice sheet to 97 percent in four days, according to NASA. Until now, the most extensive melt seen by satellites in the past three decades was about 55 percent.
Wagner said researchers don't know how much of Greenland's ice melted, but it seems to be freezing again.
"When we see melt in places that we haven't seen before, at least in a long period of time, it makes you sit up and ask what's happening?" NASA chief scientist Waleed Abdalati said. It's a big signal, the meaning of which we're going to sort out for years to come."
About the same time, a giant iceberg broke off from the Petermann Glacier in northern Greenland. And the National Snow and Ice Data Center on Tuesday announced that the area filled with Arctic sea ice continues near a record low.
Wagner and other scientists said because this Greenland-wide melting has happened before they can't yet determine if this is a natural rare event or one triggered by man-made global warming. But they do know that the edges of Greenland's ice sheets have already been thinning because of climate change.
Summer in Greenland has been freakishly warm so far. That's because of frequent high-pressure systems that have parked over the island, bringing warm, clear weather that melts ice and snow, explained University of Georgia climatologist Thomas Mote.
He and others say it's similar to the high-pressure systems that have parked over the American Midwest bringing record-breaking warmth and drought.
Ohio State University ice scientist Jason Box, who returned Tuesday from a three-week visit, said he ditched his cold weather gear for the cotton pants that he normally dons in Nevada.
"It was sunny and warm and all the locals were talking about how sunny it was," Box said after getting off a plane. "Beyond T-shirt weather."
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
http://www.usatoday.com/weather/climate/story/2012-07-25/greenland-ice-sheet-melt-climate-change/56479518/1
Although we can not turn back time I think this is very frustrating to those of us who remember these warnings a good 30 or more years ago, when stopping the pollution could have made a difference.
Continuing to foul our air, water and land because of the idea that it can't be reversed or because someone believes this is the end of days, seems to me like simply giving up.
Perhaps we can use our intelligence to mitigate the destruction we see around us, if not for ourselves then for our children and grandchildren.
There used to be a belief in doing things for the betterment of mankind.
Continuing to foul our air, water and land because of the idea that it can't be reversed or because someone believes this is the end of days, seems to me like simply giving up.
Perhaps we can use our intelligence to mitigate the destruction we see around us, if not for ourselves then for our children and grandchildren.
There used to be a belief in doing things for the betterment of mankind.
There is no "stupid one" on this forum........ if you have nothing to add to the subject of the thread, there's no need to post on it.
Do you need to ask?
So Mike who is the stupid one?
No adgal, believe me - you are not the stupid one.
El, you are probably right in that turning everything off now wouldn't change things. And I don't disagree that lots of this is nature and the earth's natural cycles. However, doesn't it seem reasonable that all the garbage we have been sending up into our atmosphere has done some damage? And if we could work on or find cleaner way's of doing what needs to be done, maybe we could slow down at least our part in it? I know it is not reasonable to think everyone is just going to stop driving, or stop manufacturing, etc. That isn't going to happen anytime soon. But I do think if we all did our little part maybe it could help? Maybe I'm the stupid one...lol.
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