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Journal article

Impact of very short-lived halogens on stratospheric ozone abundance and UV radiation in a geo-engineered atmosphere

Tilmes S, Kinnison D, Garcia R, Salawitch R, Canty T, Lee-Taylor J, Madronich S, Chance K ...see all

Atmospheric Chemistry and Physics, vol. 12, issue 22 (2012) pp. 10945-10955

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Abstract

The impact of very short-lived (VSL) halogenated source species on
the ozone layer and surface erythemal ultraviolet radiation (UVERY)
is investigated in the context of geo-engineering of climate by stratospheric
sulfur injection. For a projected 2040 model atmosphere, consideration
of VSL halogens at their upper limit results in lower ozone columns
and higher UVERY due to geo-engineering for nearly all seasons and
latitudes, with UVERY rising by 12% and 6% in southern and northern
high latitudes, respectively. When VSL halogen sources are neglected,
future UVERY increases due to declines in ozone column are nearly
balanced by reductions of UVERY due to scattering by the higher stratospheric
aerosol burden in mid-latitudes. Consideration of VSL sources at
their upper limit tips the balance, resulting in annual average increases
in UVERY of up to 5% in mid and high latitudes. Therefore, VSL halogens
should be considered in models that assess the impact of stratospheric
sulfur injections on the ozone layer.

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