Det er 60 år siden, at en mand besteg Mount Everest, og nu ser det ud til, at menneskeheden er i færd med at besejre i det mindste det hvide dække på toppen af verdens højeste bjerg – samtidig rykker snegrænsen længere op ad bjerget.
Researchers taking a new look at the snow and ice covering Mount Everest and the national park that surrounds it are finding abundant evidence that the world’s tallest peak is shedding its frozen cloak (kappe), writes American Geophysical Union.
The scientists have also been studying temperature and precipitation (nedbørs) trends in the area and found that the Everest region has been warming while snowfall has been declining since the early 1990s.
Members of the team conducting these studies presented their findings on May 14 at the Meeting of the Americas in Cancun, Mexico – a scientific conference organized and co-sponsored by the American Geophysical Union.
Glaciers in the Mount Everest region have shrunk by 13 percent in the last 50 years and the snowline has shifted upward by 180 meters, according to Sudeep Thakuri, who is leading the research as part of his PhD graduate studies at the University of Milan in Italy.
Glaciers smaller than one square kilometer are disappearing the fastest and have experienced a 43 percent decrease in surface area since the 1960s. Because the glaciers are melting faster than they are replenished (genskabt) by ice and snow, they are revealing rocks and debris that were previously hidden deep under the ice.
These debris-covered sections of the glaciers have increased by about 17 percent since the 1960s, according to Thakuri. The ends of the glaciers have also retreated by an average of 400 meters since 1962, his team found.
The researchers suspect that the decline of snow and ice in the Everest region is from human-generated greenhouse gases altering global climate. However, they have not yet established a firm connection between the mountains’ changes and climate change, Thakuri said.
Læs hele artiklen her: http://moa.agu.org/2013/media-center/press-item/scientists-find-extensive-glacial-retreat-in-mount-everest-region/
Begynd ved: “He and his team…”
