Chlorine makes a comeback

November 5, 2014 | Concentrations of hydrogen chloride (HCl), the main reservoir of chlorine in the stratosphere, have increased by several percent over much of the Northern Hemisphere since 2007, a new study finds. The observed buildup in HCl is attributed to a temporary shift in atmospheric circulation, rather than to any increased emission of the chlorine-containing, ozone-destroying compounds that are banned by the Montreal Protocol.

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Short title: 
Circulation slowdown allows ozone-destroying chemical to rebuild in Northern Hemisphere
Image: 
Ozone concentrations above the Arctic in March 2011 reveal significant depletion.
Source: 
ACD
Audience: 
IRWG

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ACOM | Atmospheric Chemistry Observations & Modeling