New clues to ozone depletion

Jul 26, 2007

Large quantities of ozone-depleting chemicals have been discovered in the Antarctic atmosphere by researchers from the University of Leeds, the University of East Anglia, and the British Antarctic Survey.

The team of atmospheric chemists carried out an 18-month study of the make-up of the lowest part of the earth's atmosphere on the Brunt Ice Shelf, about 20 km from the Weddell Sea. They found high concentrations of halogens - bromine and iodine oxides – which persist throughout the period when there is sunlight in Antarctica (August through May). A big surprise to the science team was the large quantities of iodine oxide, since this chemical has not been detected in the Arctic.

The source of the halogens is natural – sea-salt in the case of bromine, and in the case of iodine, almost certainly bright orange algae that coat the underside of the sea ice around the continent.

These halogens cause a substantial depletion in ozone above the ice surface. This affects the so-called oxidising capacity of the atmosphere - its ability to "clean itself" by removing certain - often man-made - chemical compounds. The iodine oxides also form tiny particles (a few nanometres in size), which can grow to form ice clouds, with a consequent impact on the local climate.

Scientists now plan to carry out further research to assess what impact this may be having on the local environment. Very recent satellite observations by one of the team, Dr Alfonso Saiz-Lopez, have confirmed that iodine oxides are widespread throughout coastal Antarctica.

John Plane, professor of atmospheric chemistry at the University of Leeds, says: "Halogens in the lowest part of the atmosphere have important impacts on ozone depletion, the ability of the atmosphere to remove potentially harmful compounds, and aerosol formation. All these atmospheric phenomena are linked to climate change. We still have to work out what the ramifications of this discovery are. These exciting results also show how important it is to keep exploring the atmosphere - there seems to be plenty more to find out."

Using high-tech measuring equipment, a beam of light was projected across the ice shelf and the spectrum of the reflected light analysed and chemical levels measured. The work was carried out in a new atmospheric observatory at Halley Station, operated by the British Antarctic Survey, and was supported by funding from the U.K.’s Natural Environment Research Council.

Source: University of Leeds

Explore further: European space plane set for February launch

add to favorites email to friend print save as pdf

Related Stories

Spectroscopy for the Real World

Jan 31, 2005

New system used to analyze environmental, biological phenomena in their natural state One good thing leads to another. A team of scientists used a first-of-its-kind spectroscopy system at the U.S. Departmen ...

Recommended for you

NASA issues 'remastered' view of Jupiter's moon Europa

1 hour ago

(Phys.org) —Scientists have produced a new version of what is perhaps NASA's best view of Jupiter's ice-covered moon, Europa. The mosaic of color images was obtained in the late 1990s by NASA's Galileo ...

European space plane set for February launch

7 hours ago

Europe's first-ever "space plane" will be launched on February 11 next year, rocket firm Arianespace said Friday after a three-month delay to fine-tune the mission flight plan.

Space station rarity: Two women on long-term crew

7 hours ago

For the 21st-century spacewoman, gender is a subject often best ignored. After years of training for their first space mission, the last thing Samantha Cristoforetti and Elana Serova want to dwell on is the ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.