Modulation of the Aleutian–Icelandic low seesaw and its surface impacts by the Atlantic Multidecadal Oscillation
Early studies suggested that the Aleutian–Icelandic low seesaw (AIS) features multidecadal variation. In this study, the multidecadal modulation of the AIS and associated surface climate by the Atlantic Multidecadal Oscillation (AMO) during late winter (February–March) is explored with observational...
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ftunivbergen:oai:bora.uib.no:1956/17666 2023-05-15T13:15:03+02:00 Modulation of the Aleutian–Icelandic low seesaw and its surface impacts by the Atlantic Multidecadal Oscillation Li, Fei Orsolini, Yvan Wang, Huijun Gao, Yongqi He, Shengping 2018-01-04T15:10:34Z application/pdf https://hdl.handle.net/1956/17666 https://doi.org/10.1007/s00376-017-7028-z eng eng Springer Norges forskningsråd: 229774 Norges forskningsråd: 244166 NILU - Norsk institutt for luftforskning: 115089 urn:issn:1861-9533 urn:issn:0256-1530 https://hdl.handle.net/1956/17666 https://doi.org/10.1007/s00376-017-7028-z cristin:1533880 Copyright 2018 Chinese National Committee for International Association of Meteorology and Atmospheric Sciences, Institute of Atmospheric Physics, Science Press and Springer-Verlag GmbH Germany, part of Springer Nature Advances in Atmospheric Sciences Aleutian–Icelandic low seesaw Atlantic Multidecadal Oscillation Pacific–North America–Atlantic pattern stratospheric polar vortex Peer reviewed Journal article 2018 ftunivbergen https://doi.org/10.1007/s00376-017-7028-z 2023-03-14T17:43:37Z Early studies suggested that the Aleutian–Icelandic low seesaw (AIS) features multidecadal variation. In this study, the multidecadal modulation of the AIS and associated surface climate by the Atlantic Multidecadal Oscillation (AMO) during late winter (February–March) is explored with observational data. It is shown that, in the cold phase of the AMO (AMO|−), a clear AIS is established, while this is not the case in the warm phase of the AMO (AMO|+). The surface climate over Eurasia is significantly influenced by the AMO’s modulation of the Aleutian low (AL). For example, the weak AL in AMO|− displays warmer surface temperatures over the entire Far East and along the Russian Arctic coast and into Northern Europe, but only over the Russian Far East in AMO|+. Similarly, precipitation decreases over central Europe with the weak AL in AMO|−, but decreases over northern Europe and increases over southern Europe in AMO|+. The mechanism underlying the influence of AMO|− on the AIS can be described as follows: AMO|− weakens the upward component of the Eliassen–Palm flux along the polar waveguide by reducing atmospheric blocking occurrence over the Euro–Atlantic sector, and hence drives an enhanced stratospheric polar vortex. With the intensified polar night jet, the wave trains originating over the central North Pacific can propagate horizontally through North America and extend into the North Atlantic, favoring an eastward-extended Pacific–North America–Atlantic pattern, and resulting in a significant AIS at the surface during late winter. acceptedVersion Article in Journal/Newspaper aleutian low Arctic North Atlantic polar night University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Pacific Advances in Atmospheric Sciences 35 1 95 105 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Aleutian–Icelandic low seesaw Atlantic Multidecadal Oscillation Pacific–North America–Atlantic pattern stratospheric polar vortex |
spellingShingle |
Aleutian–Icelandic low seesaw Atlantic Multidecadal Oscillation Pacific–North America–Atlantic pattern stratospheric polar vortex Li, Fei Orsolini, Yvan Wang, Huijun Gao, Yongqi He, Shengping Modulation of the Aleutian–Icelandic low seesaw and its surface impacts by the Atlantic Multidecadal Oscillation |
topic_facet |
Aleutian–Icelandic low seesaw Atlantic Multidecadal Oscillation Pacific–North America–Atlantic pattern stratospheric polar vortex |
description |
Early studies suggested that the Aleutian–Icelandic low seesaw (AIS) features multidecadal variation. In this study, the multidecadal modulation of the AIS and associated surface climate by the Atlantic Multidecadal Oscillation (AMO) during late winter (February–March) is explored with observational data. It is shown that, in the cold phase of the AMO (AMO|−), a clear AIS is established, while this is not the case in the warm phase of the AMO (AMO|+). The surface climate over Eurasia is significantly influenced by the AMO’s modulation of the Aleutian low (AL). For example, the weak AL in AMO|− displays warmer surface temperatures over the entire Far East and along the Russian Arctic coast and into Northern Europe, but only over the Russian Far East in AMO|+. Similarly, precipitation decreases over central Europe with the weak AL in AMO|−, but decreases over northern Europe and increases over southern Europe in AMO|+. The mechanism underlying the influence of AMO|− on the AIS can be described as follows: AMO|− weakens the upward component of the Eliassen–Palm flux along the polar waveguide by reducing atmospheric blocking occurrence over the Euro–Atlantic sector, and hence drives an enhanced stratospheric polar vortex. With the intensified polar night jet, the wave trains originating over the central North Pacific can propagate horizontally through North America and extend into the North Atlantic, favoring an eastward-extended Pacific–North America–Atlantic pattern, and resulting in a significant AIS at the surface during late winter. acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Li, Fei Orsolini, Yvan Wang, Huijun Gao, Yongqi He, Shengping |
author_facet |
Li, Fei Orsolini, Yvan Wang, Huijun Gao, Yongqi He, Shengping |
author_sort |
Li, Fei |
title |
Modulation of the Aleutian–Icelandic low seesaw and its surface impacts by the Atlantic Multidecadal Oscillation |
title_short |
Modulation of the Aleutian–Icelandic low seesaw and its surface impacts by the Atlantic Multidecadal Oscillation |
title_full |
Modulation of the Aleutian–Icelandic low seesaw and its surface impacts by the Atlantic Multidecadal Oscillation |
title_fullStr |
Modulation of the Aleutian–Icelandic low seesaw and its surface impacts by the Atlantic Multidecadal Oscillation |
title_full_unstemmed |
Modulation of the Aleutian–Icelandic low seesaw and its surface impacts by the Atlantic Multidecadal Oscillation |
title_sort |
modulation of the aleutian–icelandic low seesaw and its surface impacts by the atlantic multidecadal oscillation |
publisher |
Springer |
publishDate |
2018 |
url |
https://hdl.handle.net/1956/17666 https://doi.org/10.1007/s00376-017-7028-z |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
aleutian low Arctic North Atlantic polar night |
genre_facet |
aleutian low Arctic North Atlantic polar night |
op_source |
Advances in Atmospheric Sciences |
op_relation |
Norges forskningsråd: 229774 Norges forskningsråd: 244166 NILU - Norsk institutt for luftforskning: 115089 urn:issn:1861-9533 urn:issn:0256-1530 https://hdl.handle.net/1956/17666 https://doi.org/10.1007/s00376-017-7028-z cristin:1533880 |
op_rights |
Copyright 2018 Chinese National Committee for International Association of Meteorology and Atmospheric Sciences, Institute of Atmospheric Physics, Science Press and Springer-Verlag GmbH Germany, part of Springer Nature |
op_doi |
https://doi.org/10.1007/s00376-017-7028-z |
container_title |
Advances in Atmospheric Sciences |
container_volume |
35 |
container_issue |
1 |
container_start_page |
95 |
op_container_end_page |
105 |
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1766266700668338176 |