Impact of Ural blocking on winter warm Arctic--cold Eurasian anomalies. Part I: Blocking-induced amplification
In Part I of this study, the impact of Ural blocking (UB) on the warm Arctic–cold Eurasian (WACE) pattern associated with the winter (DJF) arctic sea ice loss during 1979-2013 is examined by dividing the arctic sea ice reduction region into two dominant subregions: the Barents and Kara Seas (BKS) an...
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American Meteorological Society
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ftncar:oai:drupal-site.org:articles_18461 2023-09-05T13:16:30+02:00 Impact of Ural blocking on winter warm Arctic--cold Eurasian anomalies. Part I: Blocking-induced amplification Luo, Dehai (author) Xiao, Yiqing (author) Yao, Yao (author) Dai, Aiguo (author) Simmonds, Ian (author) Franzke, Christian (author) 2016-06-01 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-909 https://doi.org/10.1175/JCLI-D-15-0611.1 en eng American Meteorological Society Journal of Climate articles:18461 ark:/85065/d7g162d9 http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-909 doi:10.1175/JCLI-D-15-0611.1 Copyright 2016 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. Text article 2016 ftncar https://doi.org/10.1175/JCLI-D-15-0611.1 2023-08-14T18:43:32Z In Part I of this study, the impact of Ural blocking (UB) on the warm Arctic–cold Eurasian (WACE) pattern associated with the winter (DJF) arctic sea ice loss during 1979-2013 is examined by dividing the arctic sea ice reduction region into two dominant subregions: the Barents and Kara Seas (BKS) and the North American high-latitude (NAH) region (Baffin and Hudson Bay, Davis Strait, and Labrador Sea). It is found that atmospheric response to arctic sea ice loss resembles a negative Arctic response oscillation with a dominant positive height anomaly over the Eurasian subarctic region. Regression analyses of the two subregions further show that the sea ice loss over the BKS corresponds to the UB pattern together with a positive North Atlantic Oscillation (NAO+) and is followed by a WACE anomaly, while the sea ice reduction in the NAH region corresponds to a negative NAO (NAO−) pattern with a cold anomaly over northern Eurasia. Further analyses reveal that the UB pattern is more persistent during the period 2000-13 (P2) than 1979-99 (P1) because of the reduced middle-to-high-latitude mean westerly winds over Eurasia associated with the intense BKS warming. During P2 the establishment of the UB becomes a slow process because of the role of the BKS warming, while its decay is slightly rapid. In the presence of the long-lived UB that often occurs with the NAO+, the BKS-warming-induced DJF-mean anticyclonic anomaly is intensified and widened and then expands southward during P2 to amplify the WACE pattern and induce the southward displacement of its cold anomaly and the further loss of the BKS sea ice. Thus, midlatitude Eurasian cold events should be more frequent as the sea ice loss continues over the BKS. Article in Journal/Newspaper Arctic Baffin Davis Strait Hudson Bay Labrador Sea North Atlantic North Atlantic oscillation Sea ice Subarctic OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Arctic Hudson Hudson Bay Journal of Climate 29 11 3925 3947 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
In Part I of this study, the impact of Ural blocking (UB) on the warm Arctic–cold Eurasian (WACE) pattern associated with the winter (DJF) arctic sea ice loss during 1979-2013 is examined by dividing the arctic sea ice reduction region into two dominant subregions: the Barents and Kara Seas (BKS) and the North American high-latitude (NAH) region (Baffin and Hudson Bay, Davis Strait, and Labrador Sea). It is found that atmospheric response to arctic sea ice loss resembles a negative Arctic response oscillation with a dominant positive height anomaly over the Eurasian subarctic region. Regression analyses of the two subregions further show that the sea ice loss over the BKS corresponds to the UB pattern together with a positive North Atlantic Oscillation (NAO+) and is followed by a WACE anomaly, while the sea ice reduction in the NAH region corresponds to a negative NAO (NAO−) pattern with a cold anomaly over northern Eurasia. Further analyses reveal that the UB pattern is more persistent during the period 2000-13 (P2) than 1979-99 (P1) because of the reduced middle-to-high-latitude mean westerly winds over Eurasia associated with the intense BKS warming. During P2 the establishment of the UB becomes a slow process because of the role of the BKS warming, while its decay is slightly rapid. In the presence of the long-lived UB that often occurs with the NAO+, the BKS-warming-induced DJF-mean anticyclonic anomaly is intensified and widened and then expands southward during P2 to amplify the WACE pattern and induce the southward displacement of its cold anomaly and the further loss of the BKS sea ice. Thus, midlatitude Eurasian cold events should be more frequent as the sea ice loss continues over the BKS. |
author2 |
Luo, Dehai (author) Xiao, Yiqing (author) Yao, Yao (author) Dai, Aiguo (author) Simmonds, Ian (author) Franzke, Christian (author) |
format |
Article in Journal/Newspaper |
title |
Impact of Ural blocking on winter warm Arctic--cold Eurasian anomalies. Part I: Blocking-induced amplification |
spellingShingle |
Impact of Ural blocking on winter warm Arctic--cold Eurasian anomalies. Part I: Blocking-induced amplification |
title_short |
Impact of Ural blocking on winter warm Arctic--cold Eurasian anomalies. Part I: Blocking-induced amplification |
title_full |
Impact of Ural blocking on winter warm Arctic--cold Eurasian anomalies. Part I: Blocking-induced amplification |
title_fullStr |
Impact of Ural blocking on winter warm Arctic--cold Eurasian anomalies. Part I: Blocking-induced amplification |
title_full_unstemmed |
Impact of Ural blocking on winter warm Arctic--cold Eurasian anomalies. Part I: Blocking-induced amplification |
title_sort |
impact of ural blocking on winter warm arctic--cold eurasian anomalies. part i: blocking-induced amplification |
publisher |
American Meteorological Society |
publishDate |
2016 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-909 https://doi.org/10.1175/JCLI-D-15-0611.1 |
geographic |
Arctic Hudson Hudson Bay |
geographic_facet |
Arctic Hudson Hudson Bay |
genre |
Arctic Baffin Davis Strait Hudson Bay Labrador Sea North Atlantic North Atlantic oscillation Sea ice Subarctic |
genre_facet |
Arctic Baffin Davis Strait Hudson Bay Labrador Sea North Atlantic North Atlantic oscillation Sea ice Subarctic |
op_relation |
Journal of Climate articles:18461 ark:/85065/d7g162d9 http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-909 doi:10.1175/JCLI-D-15-0611.1 |
op_rights |
Copyright 2016 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. |
op_doi |
https://doi.org/10.1175/JCLI-D-15-0611.1 |
container_title |
Journal of Climate |
container_volume |
29 |
container_issue |
11 |
container_start_page |
3925 |
op_container_end_page |
3947 |
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1776198054204932096 |