 |
| Titel |
Stratospheric aerosols from the Sarychev volcano eruption in the 2009 Arctic summer |
| VerfasserIn |
F. Jégou, G. Berthet, C. Brogniez, J.-B. Renard, P. François, J. M. Haywood, A. Jones, Q. Bourgeois, T. Lurton, F. Auriol, S. Godin-Beekmann, C. Guimbaud, G. Krysztofiak, B. Gaubicher, M. Chartier, L. Clarisse, C. Clerbaux, J. Y. Balois, C. Verwaerde, D. Daugeron |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 13 ; Nr. 13, no. 13 (2013-07-10), S.6533-6552 |
| Datensatznummer |
250018751
|
| Publikation (Nr.) |
 copernicus.org/acp-13-6533-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| Aerosols from the Sarychev volcano eruption (Kuril Islands, northeast of
Japan) were observed in the Arctic lower stratosphere a few days after the
strongest SO2 injection which occurred on 15 and 16 June 2009.
From the observations provided by the Infrared Atmospheric Sounding
Interferometer (IASI) an estimated 0.9 Tg of sulphur dioxide was injected
into the upper troposphere and lower stratosphere (UTLS). The resultant
stratospheric sulphate aerosols were detected from satellites by the Optical
Spectrograph and Infrared Imaging System (OSIRIS) limb sounder and by the
Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) and from the
surface by the Network for the Detection of Atmospheric Composition Changes
(NDACC) lidar deployed at OHP (Observatoire de Haute-Provence, France). By
the first week of July the aerosol plume had spread out over the entire
Arctic region. The Sarychev-induced stratospheric aerosol over the Kiruna
region (north of Sweden) was measured by the Stratospheric and Tropospheric
Aerosol Counter (STAC) during eight balloon flights planned in August and
September 2009. During this balloon campaign the Micro Radiomètre Ballon
(MicroRADIBAL) and the Spectroscopie d'Absorption Lunaire pour l'Observation
des Minoritaires Ozone et NOx (SALOMON) remote-sensing instruments also
observed these aerosols. Aerosol concentrations returned to near-background
levels by spring 2010. The effective radius, the surface area density (SAD),
the aerosol extinction, and the total sulphur mass from STAC in situ
measurements are enhanced with mean values in the range 0.15–0.21 μm,
5.5–14.7 μm2 cm−3, 5.5–29.5 × 10−4 km−1, and
4.9–12.6 × 10−10 kg[S] kg−1[air], respectively, between 14 km
and 18 km. The observed and modelled e-folding time of sulphate aerosols from
the Sarychev eruption is around 70–80 days, a value much shorter than the
12–14 months calculated for aerosols from the 1991 eruption of Mt Pinatubo.
The OSIRIS stratospheric aerosol optical depth (AOD) at 750 nm is enhanced by
a factor of 6, with a value of 0.02 in late July compared to 0.0035 before the
eruption. The HadGEM2 and MIMOSA model outputs indicate that aerosol layers
in polar region up to 14–15 km are largely modulated by
stratosphere–troposphere exchange processes. The spatial extent of the
Sarychev plume is well represented in the HadGEM2 model with lower altitudes
of the plume being controlled by upper tropospheric troughs which displace
the plume downward and upper altitudes around 18–20 km, in agreement with
lidar observations. Good consistency is found between the HadGEM2 sulphur
mass density and the value inferred from the STAC observations, with a maximum
located about 1 km above the tropopause ranging from 1 to
2 × 10−9 kg[S] kg−1[air], which is one order of magnitude
higher than the background level. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|