Sea ice born in the shallow seas off Russia rarely makes it out of its nursery before succumbing to melt. New research finds that two decades ago, half of the sea ice formed near the Arctic coast of Russia went on a windblown journey through the Arctic Ocean and out via the Fram Strait between Greenland and Svalbard before melting. Today, only about 20 percent of the ice born near Russia makes that journey. That's a big problem, said study leader Thomas Krumpen, an ocean ice physicist at the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research in Germany. Sea ice formed in shallow waters traps a lot of small particles, everything from sediments to algae to microplastic pollution to iron and other nutrients. When the ice melts in place rather than traveling, it affects the distribution of those substances. "How will this change in transport affect the biogeochemical cycle in the Arctic Ocean as well as the ecosystem?" Krumpen said. "This is all poorly … [Read more...] about Most of the Arctic’s ‘Baby Sea Ice’ Melts Before It Leaves the Nursery. And That’s a Problem.
Peggy’s data were a bit of a shock.From an anchored vantage point in an expanse of the southeastern Bering Sea west of Alaska, Peggy, or mooring M2, had monitored conditions in the water for 25 years. A line of sensors extended down more than 70 meters to where Peggy was tethered to the seafloor, collecting information on temperature, salinity and other properties of the water.Most years, the waxing and waning of floating sea ice follows a consistent seasonal pattern that is reflected in Peggy’s data. By November, sea ice migrates in through the Bering Strait or forms in some parts of the Bering Sea. As a by-product of the sea ice formation, a large mass of cold, salty water begins to pool near the seafloor. In the spring, phytoplankton bloom, and by early summer, the sea ice begins to melt away. The cold pool, however, lingers through the summer. With an average temperature just below zero degrees Celsius — a few degrees colder than the surrounding water — … [Read more...] about What happens when the Bering Sea’s ice disappears?
A new study looking at variations in past sea ice cover in the Norwegian Sea found the shrinkage and growth of ice was instrumental in several abrupt climate changes between 32,000 and 40,000 years ago. The growth or shrinkage of sea ice is often viewed as a symptom of climate change, but new research shows it may have played a more causative role in abrupt climate changes thousands of years ago. The study, which was published today in Science Advances, examined sediment core extracted from the Southern Norwegian sea to find that there were dramatic changes in the sea ice cover 32,000 to 40,000 years ago. UNSW Scientia Fellow Dr. Laurie Menviel who works with the Climate Change Research Centre performed numerical model simulations of climate conditions that highlighted the tight coupling between the Atlantic Meridional Overturning Circulation and sea-ice cover in the Norwegian Sea. The study, which was led by Dr. Henrik Sadatzki from the Department of Earth Science and Bjerknes Centre … [Read more...] about Sea Ice Plays Pacemaker Role in Abrupt Climate Change
Shooting photos with a lens made from ice sounds cool whichever way you say it, but unless you’re working in sub-zero temperatures, you’re going to have to get those shots pretty darn quick or else end up with a watery mess and a bunch of utterly unusable images. Photographer Mathieu Stern actually managed to make such a lens, and yes, it was as difficult a challenge as it sounds. In a post on his website, Stern says that “dreaming of creating weird lenses is my thing,” adding that the idea to fashion a camera lens from ice had been in his mind for the last couple of years. To create his so-called “iceberg lens,” the French photographer spent many months creating a 3D-printed lens body for his Sony camera that would hold and focus the unique lens. He also had to modify an ice ball maker to shape the frozen water into an optical half sphere. Once all that was taken care of, there was the small matter of tracking down a suitable chunk of iceberg that … [Read more...] about Check out these ‘cool’ photos taken with a lens made from sea ice
Dan Joling, Associated Press Updated 9:28 am CDT, Saturday, October 13, 2018 This photo provided by the United States Geological Survey shows a female Pacific walrus resting, Sept. 19, 2013 in Point Lay, Alaska. A lawsuit making its way through federal court in Alaska will decide whether Pacific walruses should be listed as a threatened species, giving them additional protections. Walruses use sea ice for giving birth, nursing and resting between dives for food but the amount of ice over several decades has steadily declined due to climate warming. (Ryan Kingsbery/U.S. Geological Survey via AP) less This photo provided by the United States Geological Survey shows a female Pacific walrus resting, Sept. 19, 2013 in Point Lay, Alaska. A lawsuit making its way through federal court in Alaska will decide ... more Photo: Ryan Kingsbery, AP This July 15, 2012, photo provided by the U.S. Geological Survey shows … [Read more...] about As sea ice melts, agency says harm to walruses not proven