Nonlinear Response of Atmospheric Blocking to Early Winter Barents–Kara Seas Warming: An Idealized Model Study
Wintertime Ural blocking (UB) has been shown to play an important role in cold extremes over Eurasia, and thus it is useful to investigate the impact of warming over the Barents–Kara Seas (BKS) on the behavior of Ural blocking. In our study the response of UB to stepwise tropospheric warming over th...
Published in: | Journal of Climate |
---|---|
Main Authors: | , , , , |
Language: | unknown |
Published: |
2022
|
Subjects: | |
Online Access: | http://www.osti.gov/servlets/purl/1787505 https://www.osti.gov/biblio/1787505 https://doi.org/10.1175/jcli-d-19-0720.1 |
id |
ftosti:oai:osti.gov:1787505 |
---|---|
record_format |
openpolar |
spelling |
ftosti:oai:osti.gov:1787505 2023-07-30T04:03:55+02:00 Nonlinear Response of Atmospheric Blocking to Early Winter Barents–Kara Seas Warming: An Idealized Model Study Chen, Xiaodan Luo, Dehai Wu, Yutian Dunn-Sigouin, Etienne Lu, Jian 2022-02-24 application/pdf http://www.osti.gov/servlets/purl/1787505 https://www.osti.gov/biblio/1787505 https://doi.org/10.1175/jcli-d-19-0720.1 unknown http://www.osti.gov/servlets/purl/1787505 https://www.osti.gov/biblio/1787505 https://doi.org/10.1175/jcli-d-19-0720.1 doi:10.1175/jcli-d-19-0720.1 54 ENVIRONMENTAL SCIENCES 2022 ftosti https://doi.org/10.1175/jcli-d-19-0720.1 2023-07-11T10:04:08Z Wintertime Ural blocking (UB) has been shown to play an important role in cold extremes over Eurasia, and thus it is useful to investigate the impact of warming over the Barents–Kara Seas (BKS) on the behavior of Ural blocking. In our study the response of UB to stepwise tropospheric warming over the BKS is examined using a dry dynamic core model. Nonlinear responses are found in the frequency and local persistence of UB. The frequency and local persistence of the UB increase with the strength of BKS warming in a less strong range and decrease with the further increase of BKS warming, which is linked to the UB propagation influenced by upstream background atmospheric circulation. For a weak BKS warming, the UB becomes more persistent due to its less westward movement associated with intensified upstream zonal wind and meridional potential vorticity gradient (PVy) in the North Atlantic mid-high latitudes, which corresponds to a negative height response over the North Atlantic high latitudes. When BKS warming is strong, a positive height response appears in the early winter stratosphere, and its subsequent downward propagation leads to a negative NAO response or increased Greenland blocking events, which reduces zonal wind and PVy in the high latitudes from North Atlantic to Europe, thus enhancing the westward propagation of UB and reducing its local persistence. The transition to the negative NAO phase and the retrogression of UB are not found when numerically suppressing the downward influence of weakened stratospheric polar vortex, suggesting a crucial role of the stratospheric pathway in nonlinear responses of UB to the early winter BKS warming. Other/Unknown Material Greenland North Atlantic SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Greenland Journal of Climate 34 6 2367 2383 |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES Chen, Xiaodan Luo, Dehai Wu, Yutian Dunn-Sigouin, Etienne Lu, Jian Nonlinear Response of Atmospheric Blocking to Early Winter Barents–Kara Seas Warming: An Idealized Model Study |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Wintertime Ural blocking (UB) has been shown to play an important role in cold extremes over Eurasia, and thus it is useful to investigate the impact of warming over the Barents–Kara Seas (BKS) on the behavior of Ural blocking. In our study the response of UB to stepwise tropospheric warming over the BKS is examined using a dry dynamic core model. Nonlinear responses are found in the frequency and local persistence of UB. The frequency and local persistence of the UB increase with the strength of BKS warming in a less strong range and decrease with the further increase of BKS warming, which is linked to the UB propagation influenced by upstream background atmospheric circulation. For a weak BKS warming, the UB becomes more persistent due to its less westward movement associated with intensified upstream zonal wind and meridional potential vorticity gradient (PVy) in the North Atlantic mid-high latitudes, which corresponds to a negative height response over the North Atlantic high latitudes. When BKS warming is strong, a positive height response appears in the early winter stratosphere, and its subsequent downward propagation leads to a negative NAO response or increased Greenland blocking events, which reduces zonal wind and PVy in the high latitudes from North Atlantic to Europe, thus enhancing the westward propagation of UB and reducing its local persistence. The transition to the negative NAO phase and the retrogression of UB are not found when numerically suppressing the downward influence of weakened stratospheric polar vortex, suggesting a crucial role of the stratospheric pathway in nonlinear responses of UB to the early winter BKS warming. |
author |
Chen, Xiaodan Luo, Dehai Wu, Yutian Dunn-Sigouin, Etienne Lu, Jian |
author_facet |
Chen, Xiaodan Luo, Dehai Wu, Yutian Dunn-Sigouin, Etienne Lu, Jian |
author_sort |
Chen, Xiaodan |
title |
Nonlinear Response of Atmospheric Blocking to Early Winter Barents–Kara Seas Warming: An Idealized Model Study |
title_short |
Nonlinear Response of Atmospheric Blocking to Early Winter Barents–Kara Seas Warming: An Idealized Model Study |
title_full |
Nonlinear Response of Atmospheric Blocking to Early Winter Barents–Kara Seas Warming: An Idealized Model Study |
title_fullStr |
Nonlinear Response of Atmospheric Blocking to Early Winter Barents–Kara Seas Warming: An Idealized Model Study |
title_full_unstemmed |
Nonlinear Response of Atmospheric Blocking to Early Winter Barents–Kara Seas Warming: An Idealized Model Study |
title_sort |
nonlinear response of atmospheric blocking to early winter barents–kara seas warming: an idealized model study |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1787505 https://www.osti.gov/biblio/1787505 https://doi.org/10.1175/jcli-d-19-0720.1 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland North Atlantic |
genre_facet |
Greenland North Atlantic |
op_relation |
http://www.osti.gov/servlets/purl/1787505 https://www.osti.gov/biblio/1787505 https://doi.org/10.1175/jcli-d-19-0720.1 doi:10.1175/jcli-d-19-0720.1 |
op_doi |
https://doi.org/10.1175/jcli-d-19-0720.1 |
container_title |
Journal of Climate |
container_volume |
34 |
container_issue |
6 |
container_start_page |
2367 |
op_container_end_page |
2383 |
_version_ |
1772815047941160960 |