Posted on May 13, 2015 by Bob Berwyn
Larsen C Ice Shelf has dwindled by 4 meters in 15 years
Melting ice shelves in Antarctica will speed the rate of sea level rise. @bberwyn photo.
FRISCO — One of Antarctica’s giant ice shelves has thinned by more than 12 feet in the past 15 years and could collapse within the next 100 years — or possibly sooner and without much warning, according to scientists with the British Antarctic Survey.
The new study was focused on trying to determine why the Larsen C Ice Shelf is melting away. The ice shelf is along the east coast of the Antarctic Peninsula, one of the fastest warming regions on Earth, with a temperature rise of 2.5 degrees Celsius during the last 50 years. Continue reading
Filed under: Antarctica, climate and weather, Environment, global warming | Tagged: British Antarctic Survey, climate change, global sea level rise, global warming, Larsen C Ice Shelf | 2 Comments »
Posted on January 6, 2015 by Bob Berwyn
Antarctic sea urchins may be able to adapt to global warming. Photo courtesy NOAA.
Lab testing measures response to rising temps, increasing acidification
FRISCO — Sea urchins around the Antarctic Peninsula are able to adapt to warmer and more acidic seawater conditions expected by the end of the century, at least in a laboratory setting.
The study, led by scientists from the British Antarctic Survey and Bangor University, involved collecting 288 sea urchins and and transporting them to the British Antarctic Survey in Cambridge, UK. Continue reading
Filed under: Antarctica, Environment, global warming, ocean acidification | Tagged: Antarctica, British Antarctic Survey, global warming, ocean acidification | Leave a comment »
Posted on July 24, 2014 by Bob Berwyn
Fur seals on Half Moon Island, in the South Shetland chain, off the Antarctic Peninsula. bberwyn photo.
Survival of the fittest?
By Summit Voice
FRISCO — After studying fur seals around Antarctica for decades, researchers with the British Antarctic Survey say they’re seeing distinct genetic changes related to a changing climate and food availability. But despite a shift towards individuals more suited to changing environmental conditions, this fitness is not passing down through generations, leaving the fur seal population on South Georgia Island in decline. Continue reading
Filed under: Antarctica, biodiversity, climate and weather, global warming | Tagged: Antarctica, British Antarctic Survey, fur seals, genetic adaptation, global, warming | Leave a comment »
Posted on January 11, 2014 by Bob Berwyn
Emperor penguin colonies show up as dark splotches against the white ice near Halley Bay. PHOTO COURTESY DIGITALGLOBE.
Recent satellite observations show birds adapting to changes in sea ice
By Bob Berwyn
FRISCO — Emperor penguins living at the edge of their range may be able to find new breeding grounds as their sea-ice breeding habitat dwindles in coming decades.
Recent satellite monitoring shows that the Antarctic birds moved from their traditional sea-ice breeding grounds during years when the thin layer of ice (sea ice) formed later than usual to the much thicker floating ice shelves that surround the continent.
“When they turn up to breed, there needs to be a solid blanket of sea ice,” said British Antarctic Survey researcher Peter Frewell, lead author of the paper published this week in the online journal, PLOS ONE. The research team also included scientists from the Australian Antarctic Division and the Scripps Institution of Oceanography at UC San Diego in California. Continue reading
Filed under: Antarctica, biodiversity, climate and weather, Environment, global warming | Tagged: Antarctica, biodiversity, British Antarctic Survey, climate change, emperor penguins, Environment | 1 Comment »
Posted on September 19, 2013 by Bob Berwyn
Strong storms help push water through the Drake Passage, and beneath the surface, the surging currents help mix the ocean from top to bottom. bberwyn photo.
Underwater mountains help churn up the ocean, fueling the carbon cycle
By Summit Voice
FRISCO — The Drake Passage, between the tip of South America and the Antarctic Peninsula, is well known for wild storms and big swell, but it turns out that turbulence isn’t just at the surface.
Far beneath the breaking whitecaps, the area is a crucial ocean mixing ground, where surface water is exchanged with deep water as currents rush over undersea mountains. Those mixing of water layers are crucial to regulating the Earth’s climate and ocean currents, according to researchers who recently traced how that mixing happens. Continue reading
Filed under: Antarctica, climate and weather, Environment | Tagged: Antarctic Peninsula, British Antarctic Survey, Drake Passage, ocean mixing carbon cycle, oceans, Southern Ocean, University of Exeter, Woods Hole Oceanographic Institution | Leave a comment »
Posted on September 11, 2013 by Bob Berwyn
Core samples from subglacial lake sediments show surprising biological diversity
Retreating ice on the Antarctic Peninsula has given scientists an opportunity to search for life in subglacial environments. bberwyn photo
By Summit Voice
FRISCO — Burrowing 10 feet down into the primal muck at the edge of a receding ice sheet in Antarctica, scientists with the British Antarctic Survey found what they had long been looking for — traces of microbial life dating back nearly a hundred thousand years, including strands of DNA associated with previously unknown bacteria.
For decades, researchers speculated that so-called extremophiles might exist in the cold and dark lakes hidden deep beneath the Antarctic ice sheet. Organisms living in subglacial lakes could hold clues for how life might survive on other planets.
“This is the first time microbes have been identified living in the sediments of a subglacial Antarctic lake and indicates that life can exist and potentially thrive in environments we would consider too extreme,” said lead author David Pearce, who was with the British Antarctic Survey and is now at the University of Northumbria. Continue reading
Filed under: Antarctica, biodiversity, climate and weather, Environment, global warming | Tagged: British Antarctic Survey, extremophiles, Lake Ellsworth, Lake Hodgson | 1 Comment »
Posted on September 9, 2013 by Bob Berwyn
Robots, seal-mounted instruments and remote-operated subs part of ambitious project to study Pine Island, Thaite glaciers
West Antarctic ice sheets are melting fast, and scientists want to know why. bberwyn photo
By Summit Voice
FRISCO — With this year’s Antarctic research season starting to ramp up, a key focus is taking a closer look at ice sheets on the western side of the continent, where rapid ice loss from the Pine Island and Thwaite glaciers could affect sea level worldwide.
A team of researchers led by the British Antarctic Survey aims to discover what’s causing the recent rapid ice loss, and whether this loss will continue to increase or slow down. Continue reading
Filed under: Antarctica, climate and weather, Environment, global warming | Tagged: Amundsen Sea, Antarctica, British Antarctic Survey, Pine Island Glacier, sea level, West Antarctic Ice Sheet | Leave a comment »