effect of volcanic aerosol on stratospheric no2 and n2o5 from 2002–2014 as measured by odin-osiris and envisat-mipas
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2017
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Abstract
Following the large volcanic eruptions of Pinatubo in 1991 and El
Chichón in 1982, decreases in stratospheric NO2 associated with
enhanced aerosol were observed. The Optical Spectrograph and Infrared Imaging
Spectrometer (OSIRIS) measured the widespread enhancements of
stratospheric aerosol following seven volcanic eruptions between 2002 and
2014, although the magnitudes of these eruptions were all much smaller than
the Pinatubo and El Chichón eruptions. In order to isolate and quantify
the relationship between volcanic aerosol and NO2, NO2 anomalies
were calculated using measurements from OSIRIS and the Michelson
Interferometer for Passive Atmospheric Sounding (MIPAS). In the tropics,
variability due to the quasi-biennial oscillation was subtracted from the
time series. OSIRIS profile measurements indicate that the strongest
anticorrelations between NO2 and volcanic aerosol extinction were for
the 5 km layer starting ∼ 3 km above the climatological mean
tropopause at the given latitude. OSIRIS stratospheric NO2 partial
columns in this layer were found to be smaller than background NO2
levels during these aerosol enhancements by up to ∼ 60 % with
typical Pearson correlation coefficients of R ∼ −0. 7. MIPAS also
observed decreases in NO2 partial columns during periods affected by
volcanic aerosol, with percent differences of up to ∼ 25 % relative
to background levels. An even stronger anticorrelation was observed between
OSIRIS aerosol optical depth and MIPAS N2O5 partial columns, with R ∼ −0. 9, although no link with MIPAS HNO3 was observed. The
variation in OSIRIS NO2 with increasing aerosol was found to be
consistent with simulations from a photochemical box model within the estimated
model uncertainty.
| Reference Key |
adams2017atmosphericeffect
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|---|---|
| Authors | ;C. Adams;C. Adams;A. E. Bourassa;C. A. McLinden;C. E. Sioris;T. von Clarmann;B. Funke;L. A. Rieger;D. A. Degenstein |
| Journal | Journal of agricultural and food chemistry |
| Year | 2017 |
| DOI |
10.5194/acp-17-8063-2017
|
| URL | |
| Keywords |
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