Volcanic effects on climate: revisiting the mechanisms
The characteristics of planetary wave energy propagation are being compared based on NCEP reanalysis data from 1958 to 2002 between boreal winters after strong volcanic eruptions, non-volcanic winters and episodes of strong polar vortex lasting at least 30 days. It shows that in the volcanically dis...
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ftdoajarticles:oai:doaj.org/article:97907f88762d48ccac5bdb5e7078ca3b 2023-05-15T17:33:41+02:00 Volcanic effects on climate: revisiting the mechanisms H.-F. Graf Q. Li M. A. Giorgetta 2007-08-01T00:00:00Z https://doaj.org/article/97907f88762d48ccac5bdb5e7078ca3b EN eng Copernicus Publications http://www.atmos-chem-phys.net/7/4503/2007/acp-7-4503-2007.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/97907f88762d48ccac5bdb5e7078ca3b Atmospheric Chemistry and Physics, Vol 7, Iss 17, Pp 4503-4511 (2007) Physics QC1-999 Chemistry QD1-999 article 2007 ftdoajarticles 2022-12-30T21:50:18Z The characteristics of planetary wave energy propagation are being compared based on NCEP reanalysis data from 1958 to 2002 between boreal winters after strong volcanic eruptions, non-volcanic winters and episodes of strong polar vortex lasting at least 30 days. It shows that in the volcanically disturbed winters much more planetary wave energy is produced in the troposphere, passes through the lowermost stratosphere and enters the upper stratosphere than in any other times. This is contradicting earlier interpretations and model simulations. Possibly the observed El Ninos coinciding with the three significant eruptions in the second half of the 20th century contributed to the planetary wave energy. In order to produce the observed robust climate anomaly patterns in the lower troposphere, these planetary waves are suggested to be reflected near the stratopause instead of breaking. While a strong polar vortex is observed after volcanic eruptions in the stratosphere and in the troposphere, specific episodes of strong polar vortex regime exhibit much stronger anomalies and different dynamics. Hence it is suggested that the climate effects of volcanic eruptions are not being explained by the excitation of inherent zonal mean variability modes such as Strong Polar Vortex or Northern Annular Mode, but rather is another mode that possibly reflects upon the North Atlantic Oscillation. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Directory of Open Access Journals: DOAJ Articles |
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Directory of Open Access Journals: DOAJ Articles |
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Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 H.-F. Graf Q. Li M. A. Giorgetta Volcanic effects on climate: revisiting the mechanisms |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
The characteristics of planetary wave energy propagation are being compared based on NCEP reanalysis data from 1958 to 2002 between boreal winters after strong volcanic eruptions, non-volcanic winters and episodes of strong polar vortex lasting at least 30 days. It shows that in the volcanically disturbed winters much more planetary wave energy is produced in the troposphere, passes through the lowermost stratosphere and enters the upper stratosphere than in any other times. This is contradicting earlier interpretations and model simulations. Possibly the observed El Ninos coinciding with the three significant eruptions in the second half of the 20th century contributed to the planetary wave energy. In order to produce the observed robust climate anomaly patterns in the lower troposphere, these planetary waves are suggested to be reflected near the stratopause instead of breaking. While a strong polar vortex is observed after volcanic eruptions in the stratosphere and in the troposphere, specific episodes of strong polar vortex regime exhibit much stronger anomalies and different dynamics. Hence it is suggested that the climate effects of volcanic eruptions are not being explained by the excitation of inherent zonal mean variability modes such as Strong Polar Vortex or Northern Annular Mode, but rather is another mode that possibly reflects upon the North Atlantic Oscillation. |
format |
Article in Journal/Newspaper |
author |
H.-F. Graf Q. Li M. A. Giorgetta |
author_facet |
H.-F. Graf Q. Li M. A. Giorgetta |
author_sort |
H.-F. Graf |
title |
Volcanic effects on climate: revisiting the mechanisms |
title_short |
Volcanic effects on climate: revisiting the mechanisms |
title_full |
Volcanic effects on climate: revisiting the mechanisms |
title_fullStr |
Volcanic effects on climate: revisiting the mechanisms |
title_full_unstemmed |
Volcanic effects on climate: revisiting the mechanisms |
title_sort |
volcanic effects on climate: revisiting the mechanisms |
publisher |
Copernicus Publications |
publishDate |
2007 |
url |
https://doaj.org/article/97907f88762d48ccac5bdb5e7078ca3b |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Atmospheric Chemistry and Physics, Vol 7, Iss 17, Pp 4503-4511 (2007) |
op_relation |
http://www.atmos-chem-phys.net/7/4503/2007/acp-7-4503-2007.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/97907f88762d48ccac5bdb5e7078ca3b |
_version_ |
1766132273288052736 |