North Atlantic weather regimes in δ18O of winter precipitation: isotopic fingerprint of the response in the atmospheric circulation after volcanic eruptions
Equatorial volcanic eruptions are known to impact the atmospheric circulation on seasonal time scales through a strengthening of the stratospheric zonal winds followed by dynamic ocean-atmosphere coupling. This emerges as the positive phase of the North Atlantic Oscillation in the first 5 years afte...
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Online Access: | https://hdl.handle.net/11250/2721299 https://doi.org/10.1080/16000889.2019.1633848 |
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ftunivbergen:oai:bora.uib.no:11250/2721299 2023-05-15T17:27:50+02:00 North Atlantic weather regimes in δ18O of winter precipitation: isotopic fingerprint of the response in the atmospheric circulation after volcanic eruptions GudlaugsdOttir, Hera Sjolte, Jesper Sveinbjörnsdóttir, Árny Erla Werner, Martin Steen-Larsen, Hans Christian 2019 application/pdf https://hdl.handle.net/11250/2721299 https://doi.org/10.1080/16000889.2019.1633848 eng eng Taylor & Francis urn:issn:0280-6509 https://hdl.handle.net/11250/2721299 https://doi.org/10.1080/16000889.2019.1633848 cristin:1797320 Navngivelse-Ikkekommersiell 4.0 Internasjonal http://creativecommons.org/licenses/by-nc/4.0/deed.no Copyright 2019 The Authors 1633848 Tellus. Series B, Chemical and physical meteorology 71 1 Journal article Peer reviewed 2019 ftunivbergen https://doi.org/10.1080/16000889.2019.1633848 2023-03-14T17:41:56Z Equatorial volcanic eruptions are known to impact the atmospheric circulation on seasonal time scales through a strengthening of the stratospheric zonal winds followed by dynamic ocean-atmosphere coupling. This emerges as the positive phase of the North Atlantic Oscillation in the first 5 years after an eruption. In the North Atlantic, other modes of atmospheric circulation contribute to the climate variability but their response to volcanic eruptions has been less studied. We address this by retrieving the stable water isotopic fingerprint of the four major atmospheric circulation modes over the North Atlantic (Atlantic Ridge, Scandinavian Blocking and the negative and positive phases of the North Atlantic Oscillation (NAO − and NAO+)) by using monthly precipitation data from Global Network of Isotopes in Precipitation (GNIP) and 500 mb geo-potential height from the 20th Century Reanalysis. The simulated stable isotopic pattern of each atmospheric circulation mode is further used to assess the retrieved pattern. We test if changes in the atmospheric circulation as well as moisture source conditions as a result of volcanic eruptions can be identified by analyzing the winter climate response after both equatorial and high-latitude North Hemispheric volcanic eruptions in data, reanalysis and simulations. We report of an NAO + mode in the first two years after equatorial eruptions followed by NAO − in year 3 due to a decrease in the meridional temperature gradient as a result of volcanic surface cooling. This emerges in both GNIP data as well as reanalysis. Although the detected response is stronger after equatorial eruptions compared to high latitude eruptions, our results show that the response after high latitude eruptions tend to emerge as NAO − in year 2 followed by NAO + in year 3–4. publishedVersion Article in Journal/Newspaper North Atlantic North Atlantic oscillation University of Bergen: Bergen Open Research Archive (BORA-UiB) Tellus B: Chemical and Physical Meteorology 71 1 1633848 |
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Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
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ftunivbergen |
language |
English |
description |
Equatorial volcanic eruptions are known to impact the atmospheric circulation on seasonal time scales through a strengthening of the stratospheric zonal winds followed by dynamic ocean-atmosphere coupling. This emerges as the positive phase of the North Atlantic Oscillation in the first 5 years after an eruption. In the North Atlantic, other modes of atmospheric circulation contribute to the climate variability but their response to volcanic eruptions has been less studied. We address this by retrieving the stable water isotopic fingerprint of the four major atmospheric circulation modes over the North Atlantic (Atlantic Ridge, Scandinavian Blocking and the negative and positive phases of the North Atlantic Oscillation (NAO − and NAO+)) by using monthly precipitation data from Global Network of Isotopes in Precipitation (GNIP) and 500 mb geo-potential height from the 20th Century Reanalysis. The simulated stable isotopic pattern of each atmospheric circulation mode is further used to assess the retrieved pattern. We test if changes in the atmospheric circulation as well as moisture source conditions as a result of volcanic eruptions can be identified by analyzing the winter climate response after both equatorial and high-latitude North Hemispheric volcanic eruptions in data, reanalysis and simulations. We report of an NAO + mode in the first two years after equatorial eruptions followed by NAO − in year 3 due to a decrease in the meridional temperature gradient as a result of volcanic surface cooling. This emerges in both GNIP data as well as reanalysis. Although the detected response is stronger after equatorial eruptions compared to high latitude eruptions, our results show that the response after high latitude eruptions tend to emerge as NAO − in year 2 followed by NAO + in year 3–4. publishedVersion |
format |
Article in Journal/Newspaper |
author |
GudlaugsdOttir, Hera Sjolte, Jesper Sveinbjörnsdóttir, Árny Erla Werner, Martin Steen-Larsen, Hans Christian |
spellingShingle |
GudlaugsdOttir, Hera Sjolte, Jesper Sveinbjörnsdóttir, Árny Erla Werner, Martin Steen-Larsen, Hans Christian North Atlantic weather regimes in δ18O of winter precipitation: isotopic fingerprint of the response in the atmospheric circulation after volcanic eruptions |
author_facet |
GudlaugsdOttir, Hera Sjolte, Jesper Sveinbjörnsdóttir, Árny Erla Werner, Martin Steen-Larsen, Hans Christian |
author_sort |
GudlaugsdOttir, Hera |
title |
North Atlantic weather regimes in δ18O of winter precipitation: isotopic fingerprint of the response in the atmospheric circulation after volcanic eruptions |
title_short |
North Atlantic weather regimes in δ18O of winter precipitation: isotopic fingerprint of the response in the atmospheric circulation after volcanic eruptions |
title_full |
North Atlantic weather regimes in δ18O of winter precipitation: isotopic fingerprint of the response in the atmospheric circulation after volcanic eruptions |
title_fullStr |
North Atlantic weather regimes in δ18O of winter precipitation: isotopic fingerprint of the response in the atmospheric circulation after volcanic eruptions |
title_full_unstemmed |
North Atlantic weather regimes in δ18O of winter precipitation: isotopic fingerprint of the response in the atmospheric circulation after volcanic eruptions |
title_sort |
north atlantic weather regimes in δ18o of winter precipitation: isotopic fingerprint of the response in the atmospheric circulation after volcanic eruptions |
publisher |
Taylor & Francis |
publishDate |
2019 |
url |
https://hdl.handle.net/11250/2721299 https://doi.org/10.1080/16000889.2019.1633848 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
1633848 Tellus. Series B, Chemical and physical meteorology 71 1 |
op_relation |
urn:issn:0280-6509 https://hdl.handle.net/11250/2721299 https://doi.org/10.1080/16000889.2019.1633848 cristin:1797320 |
op_rights |
Navngivelse-Ikkekommersiell 4.0 Internasjonal http://creativecommons.org/licenses/by-nc/4.0/deed.no Copyright 2019 The Authors |
op_doi |
https://doi.org/10.1080/16000889.2019.1633848 |
container_title |
Tellus B: Chemical and Physical Meteorology |
container_volume |
71 |
container_issue |
1 |
container_start_page |
1633848 |
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1766120128523534336 |