Nonstationarity of the link between the Tropics and the summer East Atlantic pattern
A 700-year pre-industrial control run with the MPI-ESM-LR model is used to investigate the link between the summer East Atlantic (SEA) pattern and the Pacific-Caribbean rainfall dipole (PCD), a link that has previously been shown using ERA-Interim reanalysis data. In the model, it is found that the...
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Online Access: | https://hdl.handle.net/11250/2988636 https://doi.org/10.1002/asl.1026 |
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ftunivbergen:oai:bora.uib.no:11250/2988636 2023-05-15T17:33:34+02:00 Nonstationarity of the link between the Tropics and the summer East Atlantic pattern Rieke, Ole Greatbatch, Richard J. Gollan, Gereon 2021 application/pdf https://hdl.handle.net/11250/2988636 https://doi.org/10.1002/asl.1026 eng eng Wiley urn:issn:1530-261X https://hdl.handle.net/11250/2988636 https://doi.org/10.1002/asl.1026 cristin:1982821 Atmospheric Science Letters. 2021, 22 (5), e1026. Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2021 The Authors e1026 Atmospheric Science Letters 22 5 Journal article Peer reviewed 2021 ftunivbergen https://doi.org/10.1002/asl.1026 2023-03-14T17:44:21Z A 700-year pre-industrial control run with the MPI-ESM-LR model is used to investigate the link between the summer East Atlantic (SEA) pattern and the Pacific-Caribbean rainfall dipole (PCD), a link that has previously been shown using ERA-Interim reanalysis data. In the model, it is found that the link between the SEA and PCD is present in some multidecadal epochs but not in others. A simple statistical model reproduces this behaviour. In the statistical model, the SEA is represented by a white noise process plus a weak influence from the PCD based on the full 700 years of the model run. The statistical model is relevant to other extratropical modes of variability, for example, the winter North Atlantic Oscillation (NAO), that are weakly influenced by the Tropics. It follows that the link between the Tropics and the winter NAO is likely to undergo modulation on multidecadal time scales, as found in some previous studies. The results suggest that any predictability of the SEA, and by implication the NAO, based on tropical rainfall may not be robust and may, in fact, be modulated on multidecadal time scales, with implications for seasonal and decadal prediction systems. publishedVersion Article in Journal/Newspaper North Atlantic North Atlantic oscillation University of Bergen: Bergen Open Research Archive (BORA-UiB) Pacific Atmospheric Science Letters 22 5 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
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ftunivbergen |
language |
English |
description |
A 700-year pre-industrial control run with the MPI-ESM-LR model is used to investigate the link between the summer East Atlantic (SEA) pattern and the Pacific-Caribbean rainfall dipole (PCD), a link that has previously been shown using ERA-Interim reanalysis data. In the model, it is found that the link between the SEA and PCD is present in some multidecadal epochs but not in others. A simple statistical model reproduces this behaviour. In the statistical model, the SEA is represented by a white noise process plus a weak influence from the PCD based on the full 700 years of the model run. The statistical model is relevant to other extratropical modes of variability, for example, the winter North Atlantic Oscillation (NAO), that are weakly influenced by the Tropics. It follows that the link between the Tropics and the winter NAO is likely to undergo modulation on multidecadal time scales, as found in some previous studies. The results suggest that any predictability of the SEA, and by implication the NAO, based on tropical rainfall may not be robust and may, in fact, be modulated on multidecadal time scales, with implications for seasonal and decadal prediction systems. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Rieke, Ole Greatbatch, Richard J. Gollan, Gereon |
spellingShingle |
Rieke, Ole Greatbatch, Richard J. Gollan, Gereon Nonstationarity of the link between the Tropics and the summer East Atlantic pattern |
author_facet |
Rieke, Ole Greatbatch, Richard J. Gollan, Gereon |
author_sort |
Rieke, Ole |
title |
Nonstationarity of the link between the Tropics and the summer East Atlantic pattern |
title_short |
Nonstationarity of the link between the Tropics and the summer East Atlantic pattern |
title_full |
Nonstationarity of the link between the Tropics and the summer East Atlantic pattern |
title_fullStr |
Nonstationarity of the link between the Tropics and the summer East Atlantic pattern |
title_full_unstemmed |
Nonstationarity of the link between the Tropics and the summer East Atlantic pattern |
title_sort |
nonstationarity of the link between the tropics and the summer east atlantic pattern |
publisher |
Wiley |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/2988636 https://doi.org/10.1002/asl.1026 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
e1026 Atmospheric Science Letters 22 5 |
op_relation |
urn:issn:1530-261X https://hdl.handle.net/11250/2988636 https://doi.org/10.1002/asl.1026 cristin:1982821 Atmospheric Science Letters. 2021, 22 (5), e1026. |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2021 The Authors |
op_doi |
https://doi.org/10.1002/asl.1026 |
container_title |
Atmospheric Science Letters |
container_volume |
22 |
container_issue |
5 |
_version_ |
1766132118152282112 |