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 March 23, 2015 by Bob Berwyn
Scientists: ‘Climate change is a threat to life on Earth and we can no longer afford to be spectators’
A rising tide of CO2 …
FRISCO — When atmospheric carbon dioxide concentrations hit 400 parts per million about a year ago, there was widespread media coverage, explaining how the mark wasn’t all that significant in and of itself, but that it represented a psychological threshold to measure human impact on the climate.
Well guess what? CO2 emissions continue unabated, although there are some hopeful signs (global energy production increased in 2014, but CO2 emissions leveled off), and once again this spring, the atmospheric observatory atop Mauna Loa is once again measuring CO2 above the 400 ppm level — 401.77, to be exact, as of March 22, and as high as 403.10 ppm back on March 15. Continue reading
Filed under: climate and weather, climate change, Environment, global warming | Tagged: 400 ppm, climate change, climate science, CO2, global warming, greenhouse gases | 1 Comment »
Posted on February 7, 2015 by Bob Berwyn
We are creating a greenhouse world.
More research confirms climate sensitivity to CO2
FRISCO — It’s seems more certain than ever that the buildup of heat-trapping greenhouse gases in the Earth’s atmosphere is pushing the planet’s toward an entirely different state, according scientists in the UK.
Releasing a new study that took another detailed look at atmospheric CO2 concentrations during the warm Pliocene era, 2 to 3 million years ago, the researchers said it’s very likely that we are headed toward a much warmer future. Continue reading
Filed under: climate and weather, Environment, global warming | Tagged: climate change, Climate sensitivity, CO2, global warming, Pliocene era | 1 Comment »
Posted on February 6, 2015 by Bob Berwyn
Underwater volcanoes erupt in regular cycles, respond to changes in sea level
Mid-ocean volcanic ridges are like seams on a baseball.
FRISCO — Volcanic activity on the ocean floors may have a significant effect on global climate, according to scientists who were recently able to measure that vulcanism with a set of sophisticated new instruments.
Combining the data with findings from previous research, Columbia University geophysicist Maya Tolstoy shows that ocean-floor vulcanism flares up on regular cycles that can linked with changes in the Earth’s orbit and other gravitational influences, including Earth’s distance from the sun, and that those cycles may trigger periodic climate swings.
Notably, Tolstoy found that most undersea volcanoes erupt during the first half of the year, from January through June, she reported in the journal Geophysical Research Letters.
“People have ignored seafloor volcanoes on the idea that their influence is small, but that’s because they are assumed to be in a steady state, which they’re not,” said Tolstoy, a researcher at Columbia’s Lamont-Doherty Earth Observatory. “They respond to both very large forces, and to very small ones, and that tells us that we need to look at them much more closely.” Continue reading
Filed under: climate and weather, global warming | Tagged: climate change, CO2, Milankovitch cycles, ocean floor volcanoes | 3 Comments »
Posted on January 5, 2015 by Bob Berwyn
The word’s tropical rainforests, shown in green, are more important carbon sinks than previously thought.
Carbon uptake in northern forests slows
FRISCO — Tropical forests are even more important carbon sinks than previously believed, according to a new study led by NASA and the National Center for Atmospheric Research.
The study estimates that tropical forests absorb 1.4 billion metric tons of carbon dioxide out of a total global absorption of 2.5 billion, in response to rising atmospheric levels of the greenhouse gas. Continue reading
Filed under: climate and weather, climate change, Environment, forests, global warming | Tagged: carbon cycle, climate change, CO2, tropical forests | Leave a comment »
Posted on November 11, 2014 by Bob Berwyn
During the northern hemisphere winter, the Bering Sea, dividing Alaska and Siberia, becomes the most acidic region on earth (in purple) as shown in this February 2005 acidity map in pH scale. Temperate oceans are less acidic. The equatorial Pacific is left blank due to its high variability around El Niño and La Niña events. Map courtesy Taro Takahashi.
New benchmark data will help track future changes
FRISCO — The world’s oceans are acidifying at a rate of about 5 percent each decade, a trend that could cost the global economy $3 trillion a year in lost revenue from fishing, tourism and other intangible lost ecosystem services.
At that pace, warm-water corals by the end of the century could be living in waters 25 percent more acidic than they are today, raising questions about the long-term survival of coral reef ecosystems.
To paint a more detailed picture of potential impacts, scientists have created an ocean acidification map, showing how how acidity levels vary across the world’s oceans. The data should help provide a benchmark for the future, as enormous amounts CO2 from fossil fuels ends up in the sea. Continue reading
Filed under: biodiversity, coral reefs, Environment, Marine biology, ocean conservation | Tagged: climate change, CO2, Environment, global warming, greenhouse gases, ocean acidification | Leave a comment »
Posted on November 10, 2014 by Bob Berwyn
A new study projects a big spike in pollen production as atmospheric CO2 concentrations increase.
‘The implications of increasing CO2 for human health are clear’
FRISCO — Those sniffly, sneezy summer days are about to get a lot worse for allergy sufferers. Some types of grass pollen and exposure to allergens could increase by more than 200 percent in the next 100 years, due to predicted rises in carbon dioxide and ozone, according to University of Massachusetts Amherst scientists, who project a significant, worldwide impact on human health.
In their study of Timothy grass, environmental health researchers tried to determinedthe interactive effects of CO2 and ozone at projected higher levels on pollen production and concentrations of a Timothy grass pollen protein that is a major human allergen. The findings are reported in the current issue of PLOS ONE. Continue reading
Filed under: air quality, climate and weather, Environment, global warming | Tagged: allergies, carbon dioxide, climate change, CO2, pollen | 1 Comment »