Do tropical volcanic eruptions influence the Southern Annular Mode?
Large tropical volcanic eruptions have been observed to have a significant influence on the large-scale circulation patterns of the Northern Hemisphere, through mechanisms related to the radiative effects of the sulfate aerosols resulting from the volcanic injection of SO2 into the stratosphere. Whi...
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ftoceanrep:oai:oceanrep.geomar.de:12559 2023-05-15T13:57:54+02:00 Do tropical volcanic eruptions influence the Southern Annular Mode? Krüger, Kirstin Toohey, Matthew Zander, Stefanie Timmreck, Claudia 2011 https://oceanrep.geomar.de/id/eprint/12559/ unknown Krüger, K., Toohey, M. , Zander, S. and Timmreck, C. (2011) Do tropical volcanic eruptions influence the Southern Annular Mode?. [Talk] In: EGU General Assembly 2011. , 03.-08.04.2011, Vienna, Austria . Conference or Workshop Item NonPeerReviewed 2011 ftoceanrep 2023-04-07T15:01:05Z Large tropical volcanic eruptions have been observed to have a significant influence on the large-scale circulation patterns of the Northern Hemisphere, through mechanisms related to the radiative effects of the sulfate aerosols resulting from the volcanic injection of SO2 into the stratosphere. While no such volcanically induced anomalies in Southern Hemisphere circulation have yet been observed, we find that general circulation model simulations of eruptions with SO2 injections larger than that of the 1991 Mt. Pinatubo eruption do result in significant circulation changes in the SH, specifically an enhanced positive phase of the southern annular mode (SAM). We explore the mechanisms for such a SAM response, as well as the corresponding changes in SH temperature, sea ice and precipitation. We also explore how the anomalously strong zonal winds characteristic of the positive SAM regime affect the rate of sulfate deposition to the Antarctic ice-sheet, and related implications for ice-core based reconstructions of past volcanic activity. This study has relevance for better understanding SAM forcing mechanisms, interpreting observed SAM time series, and predicting future SAM changes after major volcanic eruptions. Conference Object Antarc* Antarctic ice core Ice Sheet Sea ice OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic The Antarctic |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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description |
Large tropical volcanic eruptions have been observed to have a significant influence on the large-scale circulation patterns of the Northern Hemisphere, through mechanisms related to the radiative effects of the sulfate aerosols resulting from the volcanic injection of SO2 into the stratosphere. While no such volcanically induced anomalies in Southern Hemisphere circulation have yet been observed, we find that general circulation model simulations of eruptions with SO2 injections larger than that of the 1991 Mt. Pinatubo eruption do result in significant circulation changes in the SH, specifically an enhanced positive phase of the southern annular mode (SAM). We explore the mechanisms for such a SAM response, as well as the corresponding changes in SH temperature, sea ice and precipitation. We also explore how the anomalously strong zonal winds characteristic of the positive SAM regime affect the rate of sulfate deposition to the Antarctic ice-sheet, and related implications for ice-core based reconstructions of past volcanic activity. This study has relevance for better understanding SAM forcing mechanisms, interpreting observed SAM time series, and predicting future SAM changes after major volcanic eruptions. |
format |
Conference Object |
author |
Krüger, Kirstin Toohey, Matthew Zander, Stefanie Timmreck, Claudia |
spellingShingle |
Krüger, Kirstin Toohey, Matthew Zander, Stefanie Timmreck, Claudia Do tropical volcanic eruptions influence the Southern Annular Mode? |
author_facet |
Krüger, Kirstin Toohey, Matthew Zander, Stefanie Timmreck, Claudia |
author_sort |
Krüger, Kirstin |
title |
Do tropical volcanic eruptions influence the Southern Annular Mode? |
title_short |
Do tropical volcanic eruptions influence the Southern Annular Mode? |
title_full |
Do tropical volcanic eruptions influence the Southern Annular Mode? |
title_fullStr |
Do tropical volcanic eruptions influence the Southern Annular Mode? |
title_full_unstemmed |
Do tropical volcanic eruptions influence the Southern Annular Mode? |
title_sort |
do tropical volcanic eruptions influence the southern annular mode? |
publishDate |
2011 |
url |
https://oceanrep.geomar.de/id/eprint/12559/ |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic ice core Ice Sheet Sea ice |
genre_facet |
Antarc* Antarctic ice core Ice Sheet Sea ice |
op_relation |
Krüger, K., Toohey, M. , Zander, S. and Timmreck, C. (2011) Do tropical volcanic eruptions influence the Southern Annular Mode?. [Talk] In: EGU General Assembly 2011. , 03.-08.04.2011, Vienna, Austria . |
_version_ |
1766265818009567232 |