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| Titel |
Lagrangian transport simulations of volcanic sulfur dioxide emissions: impact of meteorological data products |
| VerfasserIn |
Lars Hoffmann, Thomas Rößler, Sabine Griessbach, Yi Heng, Olaf Stein |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250140248
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| Publikation (Nr.) |
 EGU/EGU2017-3609.pdf |
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| Zusammenfassung |
| Sulfur dioxide (SO2) emissions from strong volcanic eruptions are an important natural cause
for climate variations. We applied our new Lagrangian transport model Massive-Parallel
Trajectory Calculations (MPTRAC) to perform simulations for three case studies of
volcanic eruption events. The case studies cover the eruptions of Grímsvötn, Iceland,
Puyehue-Cordón Caulle, Chile, and Nabro, Eritrea, in May and June 2011. We
used SO2 observations of the Atmospheric Infrared Sounder (AIRS/Aqua) and a
backward trajectory approach to initialize the simulations. Besides validation of
the new model, the main goal of our study was a comparison of simulations with
different meteorological data products. We considered three reanalyses (ERA-Interim,
MERRA, and NCAR/NCEP) and the European Centre for Medium-Range Weather
Forecasts (ECMWF) operational analysis. Qualitatively, the SO2 distributions from the
simulations compare well with the AIRS data, but also with Cloud-Aerosol Lidar
with Orthogonal Polarization (CALIOP) and Michelson Interferometer for Passive
Atmospheric Sounding (MIPAS) aerosol observations. Transport deviations and the critical
success index (CSI) are analyzed to evaluate the simulations quantitatively. During
the first 5 or 10 days after the eruptions we found the best performance for the
ECMWF analysis (CSI range of 0.25 – 0.31), followed by ERA-Interim (0.25 – 0.29),
MERRA (0.23 – 0.27), and NCAR/NCEP (0.21 – 0.23). High temporal and spatial
resolution of the meteorological data does lead to improved performance of Lagrangian
transport simulations of volcanic emissions in the upper troposphere and lower
stratosphere.
Reference: Hoffmann L., Rößler, T., Griessbach, S., Heng, Y., and Stein, O., Lagrangian
transport simulations of volcanic sulfur dioxide emissions: impact of meteorological data
products, J. Geophys. Res., 121(9), 4651-4673, doi:10.1002/2015JD023749, 2016. |
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