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| Titel |
Global temperature response to the major volcanic eruptions in multiple reanalysis data sets |
| VerfasserIn |
M. Fujiwara, T. Hibino, S. K. Mehta, L. Gray, D. Mitchell, J. Anstey |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 23 ; Nr. 15, no. 23 (2015-12-09), S.13507-13518 |
| Datensatznummer |
250120208
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| Publikation (Nr.) |
 copernicus.org/acp-15-13507-2015.pdf |
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| Zusammenfassung |
| The global temperature responses to the eruptions of
Mount Agung in 1963, El Chichón in 1982,
and Mount Pinatubo in 1991 are investigated
using nine
currently available
reanalysis data sets (JRA-55, MERRA, ERA-Interim, NCEP-CFSR,
JRA-25, ERA-40, NCEP-1, NCEP-2, and 20CR).
Multiple linear regression
is applied to the zonal and monthly mean time series of temperature
for two periods, 1979–2009 (for eight reanalysis data sets) and
1958–2001 (for four reanalysis data sets), by considering explanatory
factors of seasonal harmonics, linear trends, Quasi-Biennial
Oscillation, solar cycle, and El Niño Southern Oscillation.
The residuals are used to define the volcanic signals for the three
eruptions separately,
and common and different responses among the
older and newer reanalysis data sets are highlighted
for each eruption.
In response to the Mount Pinatubo eruption, most
reanalysis data sets show strong warming signals (up to 2–3 K
for 1-year average) in the tropical lower stratosphere and weak
cooling signals (down to −1 K) in the subtropical upper
troposphere. For the El Chichón eruption, warming signals in the
tropical lower stratosphere are somewhat smaller than those for the
Mount Pinatubo eruption. The response to the Mount Agung eruption is
asymmetric about the equator with strong warming in the Southern
Hemisphere midlatitude upper troposphere to lower stratosphere.
Comparison of the results from several different
reanalysis data sets confirms the atmospheric temperature response to
these major eruptions qualitatively, but also shows quantitative
differences even among the most recent reanalysis data sets.
The consistencies and differences among
different reanalysis data sets provide a measure of the
confidence and uncertainty in our current understanding
of the volcanic response.
The results of this intercomparison study may be useful
for validation of climate model responses to volcanic forcing
and for assessing proposed geoengineering by stratospheric
aerosol injection, as well as
to link studies using only a single reanalysis
data set to other studies using a different reanalysis data set. |
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