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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ftdoajarticles:oai:doaj.org/article:39b56f54b0224cb5896426e9d4c75176 2023-05-15T17:27:25+02:00 North Atlantic weather regimes in δ18O of winter precipitation: isotopic fingerprint of the response in the atmospheric circulation after volcanic eruptions Hera GuðlaugsdÓttir Jesper Sjolte ÁrnÝ Erla Sveinbjörnsdóttir Martin Werner Hans Christian Steen-Larsen 2019-01-01T00:00:00Z https://doi.org/10.1080/16000889.2019.1633848 https://doaj.org/article/39b56f54b0224cb5896426e9d4c75176 EN eng Stockholm University Press http://dx.doi.org/10.1080/16000889.2019.1633848 https://doaj.org/toc/1600-0889 1600-0889 doi:10.1080/16000889.2019.1633848 https://doaj.org/article/39b56f54b0224cb5896426e9d4c75176 Tellus: Series B, Chemical and Physical Meteorology, Vol 71, Iss 1 (2019) north atlantic climate variability stable water isotopes volcanic eruptions Meteorology. Climatology QC851-999 article 2019 ftdoajarticles https://doi.org/10.1080/16000889.2019.1633848 2022-12-30T23:54:15Z 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. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Directory of Open Access Journals: DOAJ Articles Tellus B: Chemical and Physical Meteorology 71 1 1633848 |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
north atlantic climate variability stable water isotopes volcanic eruptions Meteorology. Climatology QC851-999 |
spellingShingle |
north atlantic climate variability stable water isotopes volcanic eruptions Meteorology. Climatology QC851-999 Hera GuðlaugsdÓttir Jesper Sjolte ÁrnÝ Erla Sveinbjörnsdóttir Martin Werner Hans Christian Steen-Larsen North Atlantic weather regimes in δ18O of winter precipitation: isotopic fingerprint of the response in the atmospheric circulation after volcanic eruptions |
topic_facet |
north atlantic climate variability stable water isotopes volcanic eruptions Meteorology. Climatology QC851-999 |
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. |
format |
Article in Journal/Newspaper |
author |
Hera GuðlaugsdÓttir Jesper Sjolte ÁrnÝ Erla Sveinbjörnsdóttir Martin Werner Hans Christian Steen-Larsen |
author_facet |
Hera GuðlaugsdÓttir Jesper Sjolte ÁrnÝ Erla Sveinbjörnsdóttir Martin Werner Hans Christian Steen-Larsen |
author_sort |
Hera GuðlaugsdÓttir |
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 |
Stockholm University Press |
publishDate |
2019 |
url |
https://doi.org/10.1080/16000889.2019.1633848 https://doaj.org/article/39b56f54b0224cb5896426e9d4c75176 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Tellus: Series B, Chemical and Physical Meteorology, Vol 71, Iss 1 (2019) |
op_relation |
http://dx.doi.org/10.1080/16000889.2019.1633848 https://doaj.org/toc/1600-0889 1600-0889 doi:10.1080/16000889.2019.1633848 https://doaj.org/article/39b56f54b0224cb5896426e9d4c75176 |
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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1766119488519929856 |