Study shows how changing ocean chemistry slows life cycle
Ocean acidification could take a bite out of the economically important Dungeness crab fishery along the Pacific Northwest coast. As the oceans absorb more CO2 from the atmosphere, the increasingly corrosive water is likely slow development and reduce survival of the crab’s larval stages, according to new research by the NOAA Fisheries Northwest Fisheries Science Center in Seattle.
Ocean acidification is one of the most serious effects of increasing CO2 emissions from fossil fuel combustion. Based on what we know about emissions trends, the average pH of surface waters off the Pacific Northwest Coast is expected to drop to about 7.8, and even more when periodic upwelling carries deep water to the surface. Acidification has already been found to slow coral growth, impair shark feeding, and speed the spread of invasive species, among other impacts.
The study, recently published in the journal Marine Biology, shows that the crab larvae hatched at the same rate regardless of pH, but those that hatched at lower levels showed signs of slowed development. The researchers suggested that the lower pH may reduce the metabolic rate of embryos. That could extend their vulnerable larval period, or could jeopardize the timing of their development in relation to key food sources, the scientists said. Continue reading “Ocean acidification puts Dungeness crab fishery at risk”→
Deoxygenation caused by global warming is already detectable in some of the world’s warmest ocean areas, climate scientists said last week, announcing the results of a new study that shows how increasing global temperatures will play out.
Based on their modeling, the researchers said they could detect the influence of human-caused climate change in the southern Indian Ocean and parts of the eastern tropical Pacific and Atlantic basins. They expect to be able to detect similar signs in many other ocean areas between 2030 and 2040. Continue reading “Global warming starting to rob oceans of oxygen”→
New study says melting of small Amundsen Basin likely to trigger a climate tipping point
Just a small shift in the Antarctic climate could have long-lasting consequences on a global scale, according to a new research paper that once again takes a close look at the fate of the West Antarctic Ice Sheet.
Based on the new study, destabilization of the relatively small Amundsen Basin — triggered by a few decades of ocean warming — could trigger a massive ice loss from the West Antarctica Ice Sheet that would raise global sea level by 10 feet. Other recent studies show that this area is already losing stability, making it the first element in the climate system about to tip. Continue reading “Antarctic ice susceptible to climate domino effect”→
‘Future generations will look back and wonder why we didn’t do everything we could to save the world’s oceans …’
FRISCO — Citing the growing threat to the world’s oceans, environmental advocates want the federal government to regulate carbon dioxide under the Toxic Substances Control Act.
The regulations have been used to limit emissions of other harmful chemicals, including chlorofluorocarbons, PCBs and asbestos.
“Time’s running out to avoid a mass extinction of wildlife in our oceans,” said Miyoko Sakashita, oceans director with the Center for Biological Diversity. “It may not look like a toxic chemical, but when there’s too much CO2 in the ocean, it turns seawater corrosive and dissolves the protective shells that marine animals need to survive,” Sakashita said. Continue reading “Climate: Conservation group tries new path to limiting CO2 emissions”→
‘Those who profited least from the exploitation of fossil fuels and contributed least to greenhouse-gas emissions are hit hardest by global warming impacts’
FRISCO — It’s easiest to look at global warming through a purely scientific lens. Simple physics provide a completely logical explanation for the steady upward trend in global temperatures.
It’s much harder to to address the issue when you add politics and ethics to the equation, which is what Pope Francis sought to do with his recent “Laudato Si” encyclical on inequality and the environment.