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Accession Number N20120010506
Title Response of Ozone and Nitrogen Dioxide to the Eruption of Mount Pinatubo.
Publication Date May 2012
Media Count 17p
Personal Author A. R. Douglass L. D. Oman P. A. Newman R. S. Stolarsk
Abstract Observations have shown that the global mass of nitrogen dioxide decreased in both hemispheres in the year following the eruption of Mt. Pinatubo, indicating an enhanced heterogeneous chemistry. In contrast, the observed ozone response was largely asymmetrical with respect to the equator, with a decrease in the northern hemisphere and little change in the southern hemisphere. Simulations including enhanced heterogeneous chemistry due to the presence of the volcanic aerosol reproduce a decrease of ozone in the northern hemisphere, but also produce a comparable ozone decrease in the southern hemisphere, contrary to observations. Our simulations show that the heating due to the volcanic aerosol enhanced both the tropical upwelling and the extratropical downwelling. The enhanced extratropical downwelling, combined with the time of the eruption relative to the phase of the Brewer-Dobson circulation, increased the ozone in the southern hemisphere and counteracted the ozone depletion due to heterogeneous chemistry on volcanic aerosol.
Keywords Aerosols
Air pollution
Atmospheric chemistry
Atmospheric circulation
Atmospheric models
Nitrogen dioxide
Northern hemisphere
Ozone depletion
Southern hemisphere
Tropical regions
Upwelling water

Source Agency National Aeronautics and Space Administration
NTIS Subject Category 55C - Meteorological Data Collection, Analysis, & Weather Forecast
Corporate Author Goddard Space Flight Center, Greenbelt, MD.
Document Type Journal article
Title Note N/A
NTIS Issue Number 1226
Contract Number N/A

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