Thaw in Greenland: the picture shows a 40% melt the July 7, 2012 (red / right) and 97% on 12 July (Red / Left.). (Nicolo DiGirolamo / Jesse Allen – NASA Earth Observatory)
In just four days, 97% of its ice melts suffered
Scientists observed between 8 and 12 July 2012, a dramatic thaw in the surface layer covering Greenland. 97% suffered meltdowns, which would be most affected in more than 30 years of satellite observations area.
The ice of Greenland, autonomous state of Denmark, is about 2 kilometers thick at its center but ends in thin layers on the edges. According to data from three independent satellites, researchers found a merger virtually in its entirety sometime in mid-July, NASA said yesterday.
In the case of the thaw in height, most it turned to freezing, but experts are studying whether this will affect the overall volume of ice loss experienced during the summer, which can contribute to raising the level sea.
According to the specialist and director of the NASA Cryosphere Program in Washington, Tom Wagner, the Greenland ice sheet has a very complex and varied history, and this phenomenon the release of large iceberg Petermann last week adds.
“This was so extraordinary that at first I questioned the result: is this real or was it due to a data error” revealed Nghiem Joung Space Center NASA Goddard, confirming data analysis in the radar Indian Space Research Organisation (ISRO) Oceansat for two weeks.
Dorothy Hall Nghiem Goddard, study the surface temperature of Greenland Imaging Spectrometer (MODIS) aboard NASA’s Terra and Aqua satellites. The results showed unusual temperature rises while melting on the surface of the ice sheet extended, NASA reported.
Thomas Mote, a climatologist at the University of Georgia, Athens, Georgia, and Marco Tedesco, of the City University of New York also confirmed the melting ice of Greenland, seen from the Oceansat -2 satellite, NASA says.
According MODIS maps, July 8 to 40% of the surface showed signs of melting and July 12, this figure rose to 97%, which coincided with a host of high temperatures over Greenland at that time.
“Even the area around Summit Station in central Greenland, which at 2 kilometers above sea level is near the highest point of the ice sheet, showed signs of melting,” the study authors .
This merger pronounced in the Summit and the ice has not occurred since 1889, according to ice cores analyzed by Kaitlin Keegan at Dartmouth College in Hanover.
The National Oceanic and Atmospheric Administration (NOAA) of the United States has a weather station on the summit of Greenland, recorded temperatures were one degree above freezing for several hours on July 11-12.
Ice cores from the summit show that some fusion events of this type occurred in the past, about once every 150 years on average, and the last event was in 1889, according to data provided by Lora Koenig, a glaciologist Center Goddard Space and member of the research team analyzing the satellite data.
To Nghiem, the finding is disturbing and should see what can be the impact.