EARTH DAY for GLOBALWARMING

PASADENA, - Ice in the Arctic Sea has become dramatically since 2004, and ice that are older and thicker, and broken open the way for the ice that more and more young slim, that melt in the summer in the north of the Earth, some scientists such reports U.S. institutions in outer space, NASA.

The researchers for many years already know, the ice cover the Arctic Ocean has been shrink in one area, but new satellite data that measure the ice thickness shows the sea ice volume also shrink.

That's important because the ice is thicker and more ulet can survive from summer to next summer.

Without glaze, the dark Arctic Ocean absorbs heat more easily and the sun rays memantulkannya not occur on the ice as the flamboyant, so that the speed increase the impact of warming.

Through a report that is sent aircraft outer ICESat, a NASA used, the scientists describe, on the whole Arctic sea ice is thin 7-inch (17.78 centimeters) per year since 2004, as much as 2.2 feet (0.67 meters) for four winter. Their findings are reported in the "Journal of Geophysical Research-Ocean."

The whole area is closed to ice a more older and thicker the sintas at least one season during the summer now shrink as much as 42 percent.

Beyond that, the new satellite data showed, the old hard ice at the same time diminish with increasing number of young ice is brittle, difficult to see that clearly from the previous data.

In 2003, as much as 62 percent of the entire volume of ice in the Arctic are stored in the ice layer over the years, and 38 percent of seasonal ice in the first year. Until last year, 68 percent of first year ice is 32 percent ice, and following years, the more hard.

The research team said, and the deviation of the global warming is suspected in the circulation of sea ice as the cause.

"We lose more ice, old, and that it is important," said Ron Kwok from the Jet Propulsion Laboratory in Pasadena, California, was reported as news the UK, Reuters.

"Basically we know how many regions shrink, but we do not know how thick."

To find out the volume of ice, the plane outer NASA, ICESat, measure how high the ice mencuat above sea level in the North Pole, Kwok said in an interview phone or device.

"If we know how much ice float on top, we can use it to calculate the rest of the ice thickness is. Sebilan Around ten per ice that was under water," said Kwok.

ICESat measurements seem to cover the entire North Pole, and all of that combined with the measurement of the volume of ice that made submarine, which includes only a few times in the entire travel area.

Arctic sea ice melt to the low level of both years ago, up slightly from the low level of the time in 2007, the Center for Snow and Ice Data U.S.

Arctic ice is one factor in the weather patterns and global climate, because the difference between the cold air in the two polar air and warm the Earth around the Equator the flow of air and water, including the flow of the jet.