The loss of ozone over Antarctica in the southern hemisphere is relatively well documented and popularly known, especially within Australia where for residents of southern states (like the island state … [Read full article]
A new study has found that massive volcanic eruptions that took place over the past 70,000 years in Nicaragua could have injected enough gases into the atmosphere to temporarily … [Read full article]
by Jeff Turrentine, an OnEarth Magazine repost F. Sherwood Rowland, the chemist whose work on ozone layer depletion won a Nobel Prize, died last Saturday in California. Rowland earned his place … [Read full article]
The European Space Agency, the UN’S World Meteorological Organization, and the Alfred Wegener Institute for Polar and Marine Research are among the leading authorities reporting a record depletion of the ozone layer over the Arctic.
According to the WMO, “depletion of the ozone layer … has reached an unprecedented level over the Arctic this spring because of the continuing presence of ozone-depleting substances…”
NASA’s Goddard Space Flight Center has produced this map and the following video representing the ozone loss over the Arctic over the beginning of 2010 and 2011. They show the concentrations of ozone over the Arctic as monitored by the Ozone Monitoring Instrument (OMI) onboard NASA’s Aura satellite.
Cooler temperatures in the ozone layer above the Arctic have recently caused a dramatic drop in ozone levels, suggesting that the region is in for a record loss of the trace gas that protects the planet’s surface from ultraviolet radiation from the sun.
The scientists used a general circulation model known as ModelE (developed at NASA’s Goddard Institute for Space Studies, New York). The model calculates ocean-atmosphere coupling effects in addition to allowing varying aerosol inputs.
The initial input for the simulation was 5 teragrams (megatons) of black carbon particles injected into Earth’s upper troposphere. This is the estimated result of the surface detonation of 100 Hiroshima-size bombs (each equivalent to 15K tons of TNT).
“Runoff from agricultural and urban watersheds has increased the availability of nitrogen in streams and rivers, greatly increasing nitrous oxide production rates,” said Jake Beaulieu, a postdoctoral researcher at the … [Read full article]
The NASA/Global Hawk team, lead by Chris Naftel at the Dryden Research Center (Edwards Air Force base), is preparing for an important remote monitoring mission called the Global Hawk Pacific campaign, or GloPac, which will be comprised of four to five separate flights over the Pacific Ocean and the Arctic.
There’s nothing quite as nice as a really catchy title that perfectly sums up your story. If you want to leave it at that, then you’ve probably got the whole … [Read full article]