Posted on September 6, 2014 by Bob Berwyn
Arctic cloud formation still a climate wild card
Sun glints off a sea ice lead in an otherwise heavily ridged ice pack, Canada Basin (Arctic Ocean). Credit: NASA/Sinead Farrell
FRISCO — The ongoing loss of Arctic sea ice is probably already affecting weather and climate in the mid-latitudes of the northern hemisphere. Researchers aren’t exactly sure of how, but there’s been plenty of speculation, mostly focused around changes in the jet stream.
Climate scientists may know a bit more in a few years after they study the results of a new NASA field campaign studying the effect of sea ice retreat on Arctic climate. The Arctic Radiation IceBridge Sea and Ice Experiment (ARISE) will conduct research flights Aug. 28 through Oct. 1, covering the peak of summer sea ice melt. Continue reading
Filed under: Arctic, climate and weather, extreme weather, global warming | Tagged: Arctic sea ice, climate, extreme weather, global warming, NASA | 1 Comment »
Posted on November 19, 2013 by Bob Berwyn
A NASA image of Comet ISON taken in April 2013.
Experts still not sure if the comet will survive
By Summit Voice
FRISCO — Sky watchers hoping for a spectacular appearance by Comet ISON are carefully tracking the comet’s path as it approaches the sun. Though the comet isn’t visible to casual observers just yet, astronomers have been able to capture some clear images, especially after an outburst in mid-November boosted the comet’s brightness tenfold, according to NASA.
But nobody knows for sure what will happen next, especially since the comet is on a path for a close pass by the sun on Thanksgiving Day. There’s a chance the comet could disintegrate at any time — according to NASA, that happens less than 1 percent of the time when they get this close to the sun. Continue reading
Filed under: astronomy, Environment | Tagged: astronomy, Comet ISON, comets, NASA, Oort Cloud | Leave a comment »
Posted on November 2, 2013 by Bob Berwyn
Surface measurements will provide baseline data for upcoming satellite mission
Click on the image for more information on Greenland’s thinning ice cap.
By Summit Voice
FRISCO — A new airborne research effort by NASA will help measure ice loss in the Arctic by measuring changes in the height of the Greenland ice sheet and surrounding Arctic sea ice produced by a single season of summer melt.
The survey flights, running through Nov. 16, will collect data to improve the understanding of seasonal melt and provide baseline measurements for future satellite missions.
The land and sea ice data gathered during this campaign will give researchers a more comprehensive view of seasonal changes and provide context for measurements that will be gathered during NASA’s ICESat-2 mission, which is scheduled for launch in 2016. Continue reading
Filed under: climate and weather, Greenland | Tagged: global warming, Greenland ice sheet, IceSat-2, NASA | 1 Comment »
Posted on September 2, 2013 by Bob Berwyn
Radar data deciphers topography beneath the ice
By Summit Voice
FRISCO — Someday, if the Greenland ice cap melts because of global warming, tourists may have a new destination to rival the Grand Canyon.
After studying data from NASA’s Operation IceBridge, geographers at the University of Bristol in the United Kingdom said they found evidence of 460-mile canyon hidden under a mile of Greenland ice. In places, the previously undiscovered canyon is 2,600 feet deep. The huge gash is thought to predate the ice sheet that has covered Greenland for the last few million years.
“One might assume that the landscape of the Earth has been fully explored and mapped,” said Jonathan Bamber, professor of physical geography at the University of Bristol in the United Kingdom, and lead author of the study. “Our research shows there’s still a lot left to discover.” Continue reading
Filed under: Arctic, Greenland | Tagged: Bristol University, geography, greenland, Greenland ice sheet, NASA, Operation IceBridge, Petermann Glacier | Leave a comment »
Posted on August 24, 2013 by Bob Berwyn
New record unlikely this year, NASA says
Sun glints off a sea ice lead in an otherwise heavily ridged ice pack, Canada Basin (Arctic Ocean). Photo courtesy NASA/Sinead Farrell.
By Summit Voice
FRISCO — Arctic sea ice loss is unlikely to reach last year’s record low level, but there’s no sign of any recovery, either, NASA scientists said the week. This summer’s melt rate is consistent with the sustained decline of the Arctic ice cover observed by NASA and other satellites over the last several decades, the U.S. space agency said.
Overall, Arctic sea ice has declined at a rate of about 14 percent per decade since satellite measurements started in 1978, and rate has accelerated since 2007.
“Even if this year ends up being the sixth- or seventh-lowest extent, what matters is that the 10 lowest extents recorded have happened during the last 10 years,” said Walt Meier, a glaciologist with NASA’s Goddard Space Flight Center in Greenbelt, Md. “The long-term trend is strongly downward.” Continue reading
Filed under: Arctic, climate and weather, Environment, global warming | Tagged: Arctic sea ice, climate change, global warming, NASA | Leave a comment »
Posted on August 5, 2013 by Bob Berwyn
Long-range goal includes planning missions to redirect potentially dangerous asteroids in near-Earth orbit
A NASA satellite image shows an asteroid pockmarked with craters.
By Summit Voice
FRISCO — NASA may not be flying any shuttle missions in the immediate future, but that doesn’t mean the U.S. space agency has stopped working. Research continues on deep space exploration, including a potential manned mission to Mars in the 2030s.
Another important focus is the idea of being able to capture a near-Earth asteroid and put it into a stable orbit around the moon. The planning is beyond the science fiction stage, with engineers working on ion and electric-solar propulsion systems that could be used to reach, and then move, an asteroid.
As a first step, NASA is already planning to launch an asteroid sampling mission in 2016. OSIRIS-REx already has a target in mind — a 2018 rendezvous with the asteroid Bennu in 2018, bringing samples back to Earth in 2023. Continue reading
Filed under: world news | Tagged: Asteroid, asteroid sampling mission, NASA, near-earth asteroid, Near-Earth object, space exploration | Leave a comment »
Posted on June 13, 2013 by Bob Berwyn
New climate research could help fine-tune global warming models. Photo courtesy NASA.
Satellites and planes to scour atmosphere from top to bottom
By Summit Voice
FRISCO — Since clouds and pollution high in the atmosphere are still somewhat of a global warming wild card, scientists have been trying to refine their understanding of how those factors affect the climate.
Better data could help refine climate models used to project how much temperatures will increase the next few decades, and a new NASA research project starting in early August could deliver some of that information.
Satellite sensors will probe from above, while planes with instruments on board will fly near the edge of space and at lower elevations simultaneously to provide a multi-dimensional look at how air pollution and natural emissions, which are pushed high into the atmosphere by large storms, affect atmospheric composition and climate. Continue reading
Filed under: climate and weather, Environment, forest fires, forests, global warming | Tagged: Atmosphere, climate, forest fires, isoprene, NASA, University of Colorado Boulder | Leave a comment »