New study suggests rapid meltdown during post-ice age warming
After taking a close look at rocks from West Antarctica’s dramatic Ellsworth Mountains, climate researchers say there’s a chance that ice sheets in the region could melt quickly as the planet warms, potentially causing sea level to rise by six to eight feet.
The new study, published in Nature Communications, took a close look at Antarctic climate change about 21,000 years ago during a period of warming after the coldest point of the most recent Ice Age. They found that the West Antarctic Ice Sheet reached a tipping point, after which it thinned relatively quickly, losing 400m of thickness in 3,000 years. Continue reading “What’s the tipping point for Antarctica’s ice sheets?”→
The goal of limiting atmospheric carbon dioxide to 350 parts per million — considered the environmentally “safe” level, just moved a little farther away. Scientists tracking concentrations of the heat-trapping pollutant at a mountaintop lab in Hawaii said last week that CO2 concentrations jumped by the largest annual amount recorded since measurements began 56 years ago.
The reading comes from NOAA’s Mauna Loa Observatory, and researchers said the latest increase was the fourth year in a row that CO2 concentrations grew by more than 2 parts per million, according to a press release from NOAA.
Study pinpoints changes in global hydrological cycle
As crucial as it is for the future of humanity, calculating the rate of sea level rise has never been easy, and new measurements by NASA satellites have added a new twist to the equation. Careful study of the data from NASA’s twin NASA’s Gravity Recovery and Climate Experiment (GRACE) satellites helped show how climate-driven increases of liquid water storage on land have affected the rate of sea level rise.
Eastern Greenland changes could threaten critical ocean current
By Bob Berwyn
The global climate agreement reached late last year in Paris isn’t going to stop the Greenland Ice Sheet from melting anytime soon. Even with an immediate halt to greenhouse gas emissions. there may be centuries more melting ahead, according to climate scientists.
Sea turtles breeding along the Gulf Coast are among the species deemed most vulnerable to climate change and rising sea level, the U.S. Fish and Wildlife Service concluded in a new vulnerability assessment that looked at four Gulf ecosystems and 11 species dependent on them.
The ecosystems are mangrove, oyster reef, tidal emergent marsh and barrier islands. The species are roseate spoonbill, blue crab, clapper rail, mottled duck, spotted seatrout, eastern oyster, American oystercatcher, red drum, black skimmer, Kemp’s ridley sea turtle and Wilson’s plover.
Climate change will likely subject many low-lying Pacific island nations to more extreme fluctuations in sea level from year to year, in synch with more intense El Niño cycles. Some years, high sea level will lead to bigger floods, while in other years, big drops in sea level will leave coral reefs exposed, according to researchers based in Hawaii and Australia. Continue reading “Pacific islands face extreme sea level changes”→