期刊
GEOPHYSICAL RESEARCH LETTERS
卷 42, 期 8, 页码 3038-3047出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL063052
关键词
Pinatubo; ozone; chemical modeling; satellite data
资金
- NERC SOLCLI project [NE/D002753/1]
- NERC MAPLE project [NE/J008621/1]
- NCEO
- NASA
- Natural Environment Research Council [NE/J008621/1, NE/J02449X/1, ncas10009, NE/D002753/1, nceo020005, NE/G00367X/1] Funding Source: researchfish
- NERC [nceo020005, NE/J02449X/1, NE/G00367X/1, NE/D002753/1, NE/J008621/1] Funding Source: UKRI
Following the eruption of Mount Pinatubo, satellite and in situ measurements showed a large enhancement in stratospheric aerosol in both hemispheres, but significant midlatitude column O-3 depletion was observed only in the north. We use a three-dimensional chemical transport model to determine the mechanisms behind this hemispheric asymmetry. The model, forced by European Centre for Medium-Range Weather Forecasts ERA-Interim reanalyses and updated aerosol surface area density, successfully simulates observed large column NO2 decreases and the different extents of ozone depletion in the two hemispheres. The chemical ozone loss is similar in the Northern (NH) and Southern Hemispheres (SH), but the contrasting role of dynamics increases the depletion in the NH and decreases it in the SH. The relevant SH dynamics are not captured as well by earlier ERA-40 reanalyses. Overall, the smaller SH column O-3 depletion can be attributed to dynamical variability and smaller SH background lower stratosphere O-3 concentrations.
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