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  Background conditions influence the decadal climate response to strong volcanic eruptions

Zanchettin, D., Bothe, O., Graf, H. F., Lorenz, S., Luterbacher, J., Timmreck, C., et al. (2013). Background conditions influence the decadal climate response to strong volcanic eruptions. Journal of Geophysical Research-Atmospheres, 118, 4090-4106. doi:10.1002/jgrd.50229.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-F676-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0023-F9AD-6
Genre: Journal Article

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 Creators:
Zanchettin, Davide1, Author              
Bothe, Oliver, Author              
Graf, Hans F., Author
Lorenz, Stephan2, Author              
Luterbacher, Juerg, Author
Timmreck, Claudia3, Author              
Jungclaus, Johann H.1, Author              
Affiliations:
1Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society, ou_913553              
2Numerical Model Development and Data Assimilation, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society, ou_913555              
3Middle and Upper Atmosphere, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_913574              

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Free keywords: Keywords: Volcanic forcing; Decadal climate response; Background climate conditions; Simulation ensemble; Atlantic meridional overturning circulation; Tambora
 Abstract: Background conditions have the potential to influence the climate response to strong tropical volcanic eruptions. As a case study, we systematically assess the decadal climate response to the April 1815 Tambora eruption in a set of full-complexity Earth system model simulations. Three 10-member simulation ensembles are evaluated which describe the climate evolution of the early 19th century under (1) full-forcing conditions, (2) volcanic forcing–only conditions, and (3) volcanic forcing–only conditions excluding events preceding the Tambora eruption. The amplitude of the simulated radiative perturbation induced by the Tambora eruption depends only marginally on the background conditions. In contrast, simulated near-surface atmospheric and especially oceanic dynamics evolve significantly differently after the eruption under different background conditions. In particular, large inter-ensemble differences are found in the post-Tambora decadal evolution of oceanic heat transport and sea ice in the North Atlantic/Arctic Ocean. They reveal the existence of multiple response pathways that depend on background conditions. Background conditions are therefore not merely a source of additive noise for post-eruption decadal climate variability but actively influence the mechanisms involved in the post-eruption decadal evolution. Hence, background conditions should appropriately be accounted for in future ensemble-based numerical studies.

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Language(s): eng - English
 Dates: 2013-05-292013-05-29
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1002/jgrd.50229
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Title: Journal of Geophysical Research-Atmospheres
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Geophysical Union
Pages: - Volume / Issue: 118 Sequence Number: - Start / End Page: 4090 - 4106 Identifier: ISSN: 0148-0227
CoNE: /journals/resource/991042728714264_1