Posted on April 11, 2015 by Bob Berwyn
Rising CO2 concentrations present fundamental threat to oceans.
Current rate of acidification similar to changes during ancient extinction event
FRISCO — Climate scientists are constantly looking at the past to try and understand the present and forecast the future, and new study by University of Edinburgh researchers offers some worrisome clues about the current rate of ocean acidification.
After tracing changes in ocean chemistry that happened more than 250 million years ago, the scientists said that today’s rate of ocean acidification is similar to changes that led to the greatest known extinctions of marine life during the so-called Permian-Triassic Boundary extinction, which wiped out more than 90 per cent of marine species and more than two-thirds of the animals living on land. Continue reading
Filed under: climate and weather, global warming, ocean acidification | Tagged: climate change, Environment, ocean acidification, ocean ecosysyems, Permian Triassic extinction | Leave a comment »
Posted on March 27, 2015 by Bob Berwyn
CU-Boulder scientists study document decline of calcification rates in marine organisms around Antarctica
The Southern Ocean may lose its ability to function as a carbon sink. bberwyn photo.
*More Summit Voice stories on ocean acidification
FRISCO — The steady increase of atmospheric carbon dioxide is already causing large-scale shifts in the ocean carbon cycle, according to University of Colorado, Boulder scientists, who calculated the calcification rate of marine organisms in the Southern Ocean.
According to the scientists there has been a 24 percent decline in the amount of calcium carbonate produced in large areas of the Southern Ocean over the past 17 years. Continue reading
Filed under: climate and weather, Environment, global warming, Marine biology, ocean conservation | Tagged: carbon dioxide, CO2, global warming, greenhouse gases, ocean acidification, phytoplankton, Southern Ocean | Leave a comment »
Posted on February 25, 2015 by Bob Berwyn
New England, Gulf of Mexico, Mid-Atlantic regions all vulnerable to ocean acidification threats
Love oysters? Then you should be worried about global warming. bberwyn photo
FRISCO — Some coastal communities with long traditions of relying on shellfish to support their economies could be facing a triple whammy of pollution.
Increasing ocean acidification, combined with cold, upwelling water and polluted runoff from land could put many of those communities at long-term economic risk, according to a new study funded by the National Science Foundation’s National Socio-Environmental Synthesis Center.
“Ocean acidification has already cost the oyster industry in the Pacific Northwest nearly $110 million and jeopardized about 3,200 jobs,” said Julie Ekstrom, who was lead author on the study while with the Natural Resources Defense Council. She is now at the University of California at Davis. Continue reading
Filed under: climate and weather, global warming, ocean acidification | Tagged: climate change, Environment, global warming, ocean acidification, oysters, Shellfish | Leave a comment »
Posted on February 7, 2015 by Bob Berwyn
A world without abalone?
Improved hatchery spawning and rearing may help rebuild populations
FRISCO — West Coast fisheries biologists say they’re making progress toward restoring abalone populations with improved laboratory spawning and rearing. If the shellfish can withstand the effects of ocean acidification, resource managers may be able to rebuild populations off the coast of California. Continue reading
Filed under: biodiversity, endangered species, Environment, Marine biology, ocean conservation | Tagged: biodiversity, endangered species, ocean acidification, oceans, Shellfish, West Coast, white abalone | Leave a comment »
Posted on February 1, 2015 by Bob Berwyn
‘Our modern ocean is moving into a state that has no precedent in human history’
FRISCO — If climate clues from ages gone by are any indication, then the world’s oceans could see an abrupt, extensive loss of oxygen as the atmosphere warms and ice sheets melt.
That’s exactly what happened about 10,000 to 17,000 years ago, according to new research by scientists with the University of California, Davis, who analyzed marine sediment cores from different world regions to document the extent to which low oxygen zones in the ocean have expanded in the past, due to climate change. Continue reading
Filed under: climate and weather, Environment, global warming, ocean acidification | Tagged: climate change, global warming, ice age, ocean acidification, ocean hypoxia | 4 Comments »
Posted on January 23, 2015 by Bob Berwyn
New study projects staggering coral losses as oceans warm
A school of surgeonfish cruise coral reefs in the Pacific. Photo courtesy NOAA.
*More Summit Voice reporting on coral reefs
FRISCO —Even under a moderate climate change scenario, with just 1 to 2 degrees Celsius warming, the Great Barrier Reef may be doomed to become just a shadow of itself within a few decades, researcher said this week, warning of the cumulative impacts of warmer water, acidification, pollution and over-fishing.
In the short term, the combined effects of those impacts enable seaweed to over-run corals, in effect suffocating them. In the longer term, interactions among reef organisms would lead to dominance by other groups, including sponges and soft corals known as gorgonians. Continue reading
Filed under: climate and weather, coral reefs, Environment, global warming, ocean acidification | Tagged: climate change, global warming, Great Barrier Reef, ocean acidification | Leave a comment »
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 »