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  Simulation of the climate impact of Mt. Pinatubo eruption using ECHAM5 – Part 1: Sensitivity to the modes of atmospheric circulation and boundary conditions

Thomas, M. A., Timmreck, C., Giorgetta, M. A., Graf, H.-F., & Stenchikov, G. (2009). Simulation of the climate impact of Mt. Pinatubo eruption using ECHAM5 – Part 1: Sensitivity to the modes of atmospheric circulation and boundary conditions. Atmospheric Chemistry and Physics, 9, 1747-1766.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0011-F872-6 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-13D7-5
Genre: Journal Article

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 Creators:
Thomas, M. A.1, Author              
Timmreck, C2, 3, Author              
Giorgetta, M. A.2, 4, Author              
Graf, H.-F.2, Author              
Stenchikov, G., Author
Affiliations:
1IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society, ou_913547              
2The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_913550              
3Middle and Upper Atmosphere, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_913574              
4Climate Modelling, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_913569              

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 Abstract: The eruption of Mt. Pinatubo in the Philippines in June 1991 was one of the strongest volcanic eruptions in the 20th century and this well observed eruption can serve as an important case study to understand the subsequent weather and climate changes. In this paper, the most comprehensive simulations to date of the climate impact of Mt. Pinatubo eruption are carried out with prescribed volcanic aerosols including observed SSTs, QBO and volcanically induced ozone anomalies. This is also the first attempt to include all the known factors for the simulation of such an experiment. Here, the climate response is evaluated under different boundary conditions including one at a time, thereby, investigating the radiative and dynamical responses to individual and combined forcings by observed SSTs, QBO and volcanic effects. Two ensembles of ten members each, for unperturbed and volcanically perturbed conditions were carried out using the middle atmosphere configuration of ECHAM5 general circulation model. Our results show that the simulated climate response that may arise solely from aerosol forcing in lower stratospheric temperature is insensitive to the boundary conditions in the tropics and does not show some observed features such as the temperature signature of the QBO phases. Also, statistically significant positive anomalies in the high latitudes in NH winter of 1991/92 seen in our model simulations with prescribed observed SST and QBO phases as boundary conditions are consistent with the observations. To simulate realistically the lower stratospheric temperature response, one must include all the known factors. The pure QBO and ocean signatures in lower stratospheric temperature are simulated consistently with earlier studies. The indirect effect of the volcanic aerosols manifested as the winter warming pattern is not simulated in the ensemble mean of the experiments. Our analysis also shows that the response to El Nino conditions is very strong in the model and that it partially masks the effects due to volcanic forcing.

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Language(s): eng - English
 Dates: 2009
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: eDoc: 360753
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Title: Atmospheric Chemistry and Physics
  Alternative Title : Atmos. Chem. Phys.
Source Genre: Journal
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Pages: - Volume / Issue: 9 Sequence Number: - Start / End Page: 1747 - 1766 Identifier: -