The relationship between wintertime extreme temperature events north of 60°N and large-scale atmospheric circulations
The increased extremewarm and decreased extreme cold temperature events across the Arctic strongly influence the natural environment as well as the societal activities. This study investigates temporal and spatial variability of wintertime extreme high and low temperature events defined by the 95 an...
Published in: | International Journal of Climatology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2017
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Online Access: | https://doi.org/10.1002/joc.5024 |
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ftncar:oai:drupal-site.org:articles_21460 2023-09-05T13:16:52+02:00 The relationship between wintertime extreme temperature events north of 60°N and large-scale atmospheric circulations Yu, Lejiang (author) Sui, Cuijuan (author) Lenschow, Donald H. (author) Zhou, Mingyu (author) 2017-03-23 https://doi.org/10.1002/joc.5024 en eng International Journal of Climatology--Int. J. Climatol--08998418 articles:21460 ark:/85065/d70g3ntq doi:10.1002/joc.5024 Copyright 2017 Royal Meteorological Society. article Text 2017 ftncar https://doi.org/10.1002/joc.5024 2023-08-14T18:48:12Z The increased extremewarm and decreased extreme cold temperature events across the Arctic strongly influence the natural environment as well as the societal activities. This study investigates temporal and spatial variability of wintertime extreme high and low temperature events defined by the 95 and 5% percentiles across the Arctic and subarctic regions, respectively (north of 60 degrees N) using data from 238 stations in the Global Summary of the Day for the period 1979-2016. Empirical orthogonal function analyses indicate that the first modes (which account for 30-35% of the total variance) are out-of-phase between northern Europe, western and central Russia, and northeastern North America, and that this appears to be related to the Arctic Oscillation (AO) and the Northern Atlantic Oscillation. The second modes explain about 8% of the total variance. During the positive phase of the first and second modes the anomalous northeasterly and northerly winds decrease Arctic extreme high and increase extreme low temperature occurrences; while the anomalous southerly and southwesterly winds have the opposite effect. Symmetric and asymmetric effects of the AO index on extreme temperature events refer to the difference and sum between the composite of its positive and negative phases. The symmetric components of the spatial patterns are similar to those of the first modes. The asymmetric components occur mainly over western and central Russia for extreme high and low temperatures, respectively. In addition the impacts of six other large-scale climate modes are also explored. Article in Journal/Newspaper Arctic Subarctic OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Arctic International Journal of Climatology 37 S1 597 611 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
The increased extremewarm and decreased extreme cold temperature events across the Arctic strongly influence the natural environment as well as the societal activities. This study investigates temporal and spatial variability of wintertime extreme high and low temperature events defined by the 95 and 5% percentiles across the Arctic and subarctic regions, respectively (north of 60 degrees N) using data from 238 stations in the Global Summary of the Day for the period 1979-2016. Empirical orthogonal function analyses indicate that the first modes (which account for 30-35% of the total variance) are out-of-phase between northern Europe, western and central Russia, and northeastern North America, and that this appears to be related to the Arctic Oscillation (AO) and the Northern Atlantic Oscillation. The second modes explain about 8% of the total variance. During the positive phase of the first and second modes the anomalous northeasterly and northerly winds decrease Arctic extreme high and increase extreme low temperature occurrences; while the anomalous southerly and southwesterly winds have the opposite effect. Symmetric and asymmetric effects of the AO index on extreme temperature events refer to the difference and sum between the composite of its positive and negative phases. The symmetric components of the spatial patterns are similar to those of the first modes. The asymmetric components occur mainly over western and central Russia for extreme high and low temperatures, respectively. In addition the impacts of six other large-scale climate modes are also explored. |
author2 |
Yu, Lejiang (author) Sui, Cuijuan (author) Lenschow, Donald H. (author) Zhou, Mingyu (author) |
format |
Article in Journal/Newspaper |
title |
The relationship between wintertime extreme temperature events north of 60°N and large-scale atmospheric circulations |
spellingShingle |
The relationship between wintertime extreme temperature events north of 60°N and large-scale atmospheric circulations |
title_short |
The relationship between wintertime extreme temperature events north of 60°N and large-scale atmospheric circulations |
title_full |
The relationship between wintertime extreme temperature events north of 60°N and large-scale atmospheric circulations |
title_fullStr |
The relationship between wintertime extreme temperature events north of 60°N and large-scale atmospheric circulations |
title_full_unstemmed |
The relationship between wintertime extreme temperature events north of 60°N and large-scale atmospheric circulations |
title_sort |
relationship between wintertime extreme temperature events north of 60°n and large-scale atmospheric circulations |
publishDate |
2017 |
url |
https://doi.org/10.1002/joc.5024 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Subarctic |
genre_facet |
Arctic Subarctic |
op_relation |
International Journal of Climatology--Int. J. Climatol--08998418 articles:21460 ark:/85065/d70g3ntq doi:10.1002/joc.5024 |
op_rights |
Copyright 2017 Royal Meteorological Society. |
op_doi |
https://doi.org/10.1002/joc.5024 |
container_title |
International Journal of Climatology |
container_volume |
37 |
container_issue |
S1 |
container_start_page |
597 |
op_container_end_page |
611 |
_version_ |
1776198290474270720 |