Spatio-temporal variability of atmospheric rivers and associated atmospheric parameters in the Euro-Atlantic region
Abstract We study the spatio-temporal variability of Atmospheric Rivers (ARs) and associated integrated water vapor and atmospheric parameters over the Euro-Atlantic region using long-term reanalysis datasets. Winds, temperature, and specific humidity at different pressure levels during 1979–2018 ar...
Published in: | Theoretical and Applied Climatology |
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Springer Science and Business Media LLC
2021
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Online Access: | http://dx.doi.org/10.1007/s00704-021-03776-w https://link.springer.com/content/pdf/10.1007/s00704-021-03776-w.pdf https://link.springer.com/article/10.1007/s00704-021-03776-w/fulltext.html |
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crspringernat:10.1007/s00704-021-03776-w 2023-05-15T17:28:12+02:00 Spatio-temporal variability of atmospheric rivers and associated atmospheric parameters in the Euro-Atlantic region Thandlam, Venugopal Rutgersson, Anna Sahlee, Erik Vetenskapsrådet Uppsala University 2021 http://dx.doi.org/10.1007/s00704-021-03776-w https://link.springer.com/content/pdf/10.1007/s00704-021-03776-w.pdf https://link.springer.com/article/10.1007/s00704-021-03776-w/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Theoretical and Applied Climatology ISSN 0177-798X 1434-4483 Atmospheric Science journal-article 2021 crspringernat https://doi.org/10.1007/s00704-021-03776-w 2022-01-04T15:38:04Z Abstract We study the spatio-temporal variability of Atmospheric Rivers (ARs) and associated integrated water vapor and atmospheric parameters over the Euro-Atlantic region using long-term reanalysis datasets. Winds, temperature, and specific humidity at different pressure levels during 1979–2018 are used to study the water vapor transport integrated between 1000 and 300 hPa (IVT300) in mapping ARs. The intensity of ARs in the North Atlantic has been increasing in recent times (2009–2018) with large decadal variability and poleward shift (~ 5° towards the North) in landfall during 1999–2018. Though different reanalysis datasets show similar spatial patterns of IVT300 in mapping ARs, bias in specific humidity and wind components led to IVT300 mean bias of 50 kg m −1 s −1 in different reanalysis products compared to ERA5. The magnitude of winds and specific humidity in the lower atmosphere (below 750 hPa) dominates the total column water vapor and intensity of ARs in the North Atlantic. Reanalysis datasets in the central North Atlantic show an IVT300 standard deviation of 200 kg m −1 s −1 which is around 33% of the ARs climatology (~ 600 kg m −1 s −1 ). Though ARs have a higher frequency of landfalling over Western Europe in winter half-year, the intensity of IVT300 in winter ARs is 3% lower than the annual mean. The lower frequency of ARs in the summer half-year shows 3% higher IVT300 than the annual mean. While ARs in the North Atlantic show a strong decadal change in frequency and path, the impact of the North Atlantic Oscillation (NAO) and Scandinavian blocking on the location of landfall of ARs are significant. Furthermore, there is a strong latitudinal dependence of the source of moisture flux in the open ocean, contributing to the formation and strengthening ARs. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Springer Nature (via Crossref) Theoretical and Applied Climatology 147 1-2 13 33 |
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English |
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Atmospheric Science |
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Atmospheric Science Thandlam, Venugopal Rutgersson, Anna Sahlee, Erik Spatio-temporal variability of atmospheric rivers and associated atmospheric parameters in the Euro-Atlantic region |
topic_facet |
Atmospheric Science |
description |
Abstract We study the spatio-temporal variability of Atmospheric Rivers (ARs) and associated integrated water vapor and atmospheric parameters over the Euro-Atlantic region using long-term reanalysis datasets. Winds, temperature, and specific humidity at different pressure levels during 1979–2018 are used to study the water vapor transport integrated between 1000 and 300 hPa (IVT300) in mapping ARs. The intensity of ARs in the North Atlantic has been increasing in recent times (2009–2018) with large decadal variability and poleward shift (~ 5° towards the North) in landfall during 1999–2018. Though different reanalysis datasets show similar spatial patterns of IVT300 in mapping ARs, bias in specific humidity and wind components led to IVT300 mean bias of 50 kg m −1 s −1 in different reanalysis products compared to ERA5. The magnitude of winds and specific humidity in the lower atmosphere (below 750 hPa) dominates the total column water vapor and intensity of ARs in the North Atlantic. Reanalysis datasets in the central North Atlantic show an IVT300 standard deviation of 200 kg m −1 s −1 which is around 33% of the ARs climatology (~ 600 kg m −1 s −1 ). Though ARs have a higher frequency of landfalling over Western Europe in winter half-year, the intensity of IVT300 in winter ARs is 3% lower than the annual mean. The lower frequency of ARs in the summer half-year shows 3% higher IVT300 than the annual mean. While ARs in the North Atlantic show a strong decadal change in frequency and path, the impact of the North Atlantic Oscillation (NAO) and Scandinavian blocking on the location of landfall of ARs are significant. Furthermore, there is a strong latitudinal dependence of the source of moisture flux in the open ocean, contributing to the formation and strengthening ARs. |
author2 |
Vetenskapsrådet Uppsala University |
format |
Article in Journal/Newspaper |
author |
Thandlam, Venugopal Rutgersson, Anna Sahlee, Erik |
author_facet |
Thandlam, Venugopal Rutgersson, Anna Sahlee, Erik |
author_sort |
Thandlam, Venugopal |
title |
Spatio-temporal variability of atmospheric rivers and associated atmospheric parameters in the Euro-Atlantic region |
title_short |
Spatio-temporal variability of atmospheric rivers and associated atmospheric parameters in the Euro-Atlantic region |
title_full |
Spatio-temporal variability of atmospheric rivers and associated atmospheric parameters in the Euro-Atlantic region |
title_fullStr |
Spatio-temporal variability of atmospheric rivers and associated atmospheric parameters in the Euro-Atlantic region |
title_full_unstemmed |
Spatio-temporal variability of atmospheric rivers and associated atmospheric parameters in the Euro-Atlantic region |
title_sort |
spatio-temporal variability of atmospheric rivers and associated atmospheric parameters in the euro-atlantic region |
publisher |
Springer Science and Business Media LLC |
publishDate |
2021 |
url |
http://dx.doi.org/10.1007/s00704-021-03776-w https://link.springer.com/content/pdf/10.1007/s00704-021-03776-w.pdf https://link.springer.com/article/10.1007/s00704-021-03776-w/fulltext.html |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Theoretical and Applied Climatology ISSN 0177-798X 1434-4483 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s00704-021-03776-w |
container_title |
Theoretical and Applied Climatology |
container_volume |
147 |
container_issue |
1-2 |
container_start_page |
13 |
op_container_end_page |
33 |
_version_ |
1766120752964173824 |