Greenland and Antarctica are now losing more than three times as much ice as they were in the 1990s
By Summit Voice
SUMMIT COUNTY — Climate scientists say they’re closer to pinpointing exactly how much of Greenland’s and Antarctica’s ice is melting, and after producing the most accurate assessment of ice losses to-date, a team of satellite experts say they’ve ended 20 years of uncertainty about how much that melting ice contributes to global sea level rise.
According to the landmark study, published on Nov. 30 in the journal Science, the that melting has contributed 11.1 millimeters to global sea levels since 1992. This amounts to 20 percent of all sea level rise during the survey period. About two thirds of the ice loss was from Greenland, and the remainder was from Antarctica.
European satellite monitoring measuring changes in permafrost regions
By Summit Voice
SUMMIT COUNTY —One of the biggest concerns related to global warming is that rapid permafrost melting in northern latitudes could release a massive surge of additional carbon dioxide into the atmosphere.
It’s not clear whether such a meltdown tipping point is imminent, but the satellite record suggests the process has started, according to researchers who gathered recently at a permafrost workshop at the Alfred Wegener Institute in Potsdam, Germany.
Research presented at the conference indicates that satellites are seeing changes in land surfaces in high detail at northern latitudes, suggesting thawing permafrost. Data from satellite monitoring by the European Space Agency was a key part of the conference findings.
Study provides independent source for assessing global warming impacts
By Bob Berwyn
SUMMIT COUNTY — A comprehensive study of global satellite data shows surface temperatures of large lakes around the planet warmed significantly in the past 25 years in response to climate change.
Researchers Philipp Schneider and Simon Hook of NASA’s Jet Propulsion Laboratory in Pasadena, Calif., used satellite data to measure the surface temperatures of 167 large lakes worldwide, finding an average warming of 0.81 degrees per decade, with some lakes warming as much as 1.8 degrees Fahrenheit per decade.
The warming trend spans the globe, but is most pronounced in the mid- to high-latitudes of the Northern Hemisphere. Warming was weaker in the tropics and in the mid-latitudes of the Southern Hemisphere. That’s consistent with what’s expected based on most existing climate models, said Hook. Continue reading “Global warming: Lake ecoysytems at risk”→