Posts Tagged ‘carbon dioxide’

South Pole reaches 400 ppm of carbon dioxide

June 15, 2016 Leave a comment
South Pole carbon dioxide record - courtesy NOAA

This graphic shows the rise in daily average carbon dioxide levels at the South Pole to 400 parts per million on May 23. It’s the first time this has happened in at least four million years. Data for 2014-present recorded NOAA’s greenhouse gas monitoring network. Graphic courtesy NOAA.

The concentration of carbon dioxide in the atmosphere above our planet’s South Pole reached the worrisome threshold of 400 parts per million.

At least four million years have past since the last time carbon dioxide was so plentiful in the air above the South Pole, according to a statement announcing the milestone released Wednesday by the National Oceanic & Atmospheric Administration.

No region of Earth remains below the 400 ppm threshold.

“The far southern hemisphere was the last place on earth where CO2 had not yet reached this mark,” Pieter Tans, the lead scientist of NOAA’s Global Greenhouse Gas Reference Network, said. “Global CO2 levels will not return to values below 400 ppm in our lifetimes, and almost certainly for much longer.”

The South Pole is slower to demonstrate increases in atmospheric greenhouse gas concentrations driven by human combustion of fossil fuels because that region is so remote from the populated, and economically developed, areas of Earth.

Another federal government entity, the National Center for Atmospheric Research in Boulder, Colo., recently warned that the South Pole would soon cross the 400 ppm threshold.

Atmospheric co2 ppm - graphic courtesy Scripps Institution of Oceanography, graphic by Eric Morgan

This graphic illustrates the atmospheric concentration of carbon dioxide near Antarctica in January, just as air masses over the Southern Ocean began to exceed 400 parts per million of CO2. Graphic courtesy Scripps Institution of Oceanography, illustration by Eric Morgan.

“Throughout humanity, we have lived in an era with CO2 levels below 400 ppm,” Ralph Keeling, director of the CO2 Program at the Scripps Institution of Oceanography, said in an NCAR statement released May 12 . “With these data, we see that era drawing to a close, as the curtain of higher CO2 spreads into the Southern hemisphere from the north. There is no sharp climate threshold at 400 ppm, but this milestone is symbolically and psychologically important.”

NOAA data obtained at the South Pole indicates that the atmospheric concentration of carbon dioxide there was about 336 ppm in 1980 and has generally been rising since that time.


2015 saw record increase in atmospheric CO2 levels, NOAA says

March 10, 2016 Leave a comment
Mauna Loa observatory - courtesy NOAA, photo by Forrest Mims III

NOAA’s Mauna Loa Observatory has been gathering climate data since the 1950s. Photo courtesy NOAA, photo by Forrest Mims III.

Worldwide emissions of the greenhouse gas carbon dioxide increased by an unprecedented amount last year, according to the federal agency that monitors Earth’s climate.

The National Oceanic & Atmospheric Administration said Wednesday that the atmospheric concentration of CO2 reached 402.59 parts per million in February 2016. That was a jump of 3.05 parts per million, the largest in a 56 year-long history of record-keeping.

Confirmation of the data was provided by the Scripps Institution of Oceanography at the University of California at San Diego. However, researchers with that institution’s Scripps CO2 Group said that atmospheric concentration of carbon dioxide reached 404.16 parts per million last month.

The annual increase was greater than two parts per million for the fourth straight year.

“Carbon dioxide levels are increasing faster than they have in hundreds of thousands of years,” Pieter Tans, a scientist at NOAA’s Global Greenhouse Reference Network, said. “It’s explosive compared to natural processes.”

Keeling Curve - courtesy Scripps Institution of Oceanography

The Keeling curve shows the level of carbon dioxide, relative to other gases, in the atmosphere. Graphic courtesy Scripps Institution of Oceanography.

It has been about more than ten thousand years since Earth last experienced such a rapid increase in atmospheric carbon dioxide concentrations. Between 17,000 and 11,000 years ago the amount of CO2 in the atmosphere rose by 80 parts per million.

It is now rising at a pace 200 times faster than that, Tans said.

carbon dioxide levels at Mauna Loa, 2012-

This graph shows the past four complete years and the current year of measurement, taken at Mauna Loa Observatory in Hawaii, of atmospheric carbon dioxide levels. The dashed red line with diamond symbols represents the monthly mean values, centered on the middle of each month. The black line with the square symbols represents the same, after correction for the average seasonal cycle. Graphic courtesy NOAA.

NOAA said in a statement that the current El Niño event is contributing to the CO2 increase, but that fossil fuel combustion remains the overwhelming driver of greenhouse gas accumulation in the atmosphere.




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