Comparisons of the different definitions of the western Pacific pattern and associated winter climate anomalies in Eurasia and North America
Abstract The western Pacific pattern (WP), characterized by a meridional dipole structure in geopotential height anomalies centred at approximately 50°N over the North Pacific, is one of the most prominent teleconnection patterns over the Northern Hemisphere (NH) in boreal winter. Several methods to...
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crwiley:10.1002/joc.6993 2024-06-23T07:50:08+00:00 Comparisons of the different definitions of the western Pacific pattern and associated winter climate anomalies in Eurasia and North America Aru, Hasi Chen, Shangfeng Chen, Wen National Natural Science Foundation of China 2021 http://dx.doi.org/10.1002/joc.6993 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6993 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.6993 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6993 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 41, issue 4, page 2840-2859 ISSN 0899-8418 1097-0088 journal-article 2021 crwiley https://doi.org/10.1002/joc.6993 2024-06-06T04:22:50Z Abstract The western Pacific pattern (WP), characterized by a meridional dipole structure in geopotential height anomalies centred at approximately 50°N over the North Pacific, is one of the most prominent teleconnection patterns over the Northern Hemisphere (NH) in boreal winter. Several methods to identify the WP exist in the literature. Based on eight WP indices defined by different methods, this study analyses their dominant frequencies, spatial structures, climatic impacts, and relations to the Arctic Oscillation (AO) and El Niño‐Southern Oscillation (ENSO). The correlation coefficients of the eight WP indices show a considerable spread, but most of them are statistically significant. Most of the WPIs capture a pronounced power peak at approximately 5 years. The meridional dipole structure of the WP can be captured by all the WPIs, but it shows a large spread in the location of the centre. Several WPIs are significantly correlated with the winter AO, with marked signals of atmospheric anomalies over the Arctic region. The connections of the WP with the simultaneous winter ENSO depend largely on their definitions. The impacts of the WP on the surface air temperature over many parts of Eurasia and North America are also sensitive to its definition. Differences in surface air temperature anomalies are related to differences in the spatial structure of the WP as captured by the range of WPIs. Article in Journal/Newspaper Arctic Wiley Online Library Arctic Pacific International Journal of Climatology 41 4 2840 2859 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract The western Pacific pattern (WP), characterized by a meridional dipole structure in geopotential height anomalies centred at approximately 50°N over the North Pacific, is one of the most prominent teleconnection patterns over the Northern Hemisphere (NH) in boreal winter. Several methods to identify the WP exist in the literature. Based on eight WP indices defined by different methods, this study analyses their dominant frequencies, spatial structures, climatic impacts, and relations to the Arctic Oscillation (AO) and El Niño‐Southern Oscillation (ENSO). The correlation coefficients of the eight WP indices show a considerable spread, but most of them are statistically significant. Most of the WPIs capture a pronounced power peak at approximately 5 years. The meridional dipole structure of the WP can be captured by all the WPIs, but it shows a large spread in the location of the centre. Several WPIs are significantly correlated with the winter AO, with marked signals of atmospheric anomalies over the Arctic region. The connections of the WP with the simultaneous winter ENSO depend largely on their definitions. The impacts of the WP on the surface air temperature over many parts of Eurasia and North America are also sensitive to its definition. Differences in surface air temperature anomalies are related to differences in the spatial structure of the WP as captured by the range of WPIs. |
author2 |
National Natural Science Foundation of China |
format |
Article in Journal/Newspaper |
author |
Aru, Hasi Chen, Shangfeng Chen, Wen |
spellingShingle |
Aru, Hasi Chen, Shangfeng Chen, Wen Comparisons of the different definitions of the western Pacific pattern and associated winter climate anomalies in Eurasia and North America |
author_facet |
Aru, Hasi Chen, Shangfeng Chen, Wen |
author_sort |
Aru, Hasi |
title |
Comparisons of the different definitions of the western Pacific pattern and associated winter climate anomalies in Eurasia and North America |
title_short |
Comparisons of the different definitions of the western Pacific pattern and associated winter climate anomalies in Eurasia and North America |
title_full |
Comparisons of the different definitions of the western Pacific pattern and associated winter climate anomalies in Eurasia and North America |
title_fullStr |
Comparisons of the different definitions of the western Pacific pattern and associated winter climate anomalies in Eurasia and North America |
title_full_unstemmed |
Comparisons of the different definitions of the western Pacific pattern and associated winter climate anomalies in Eurasia and North America |
title_sort |
comparisons of the different definitions of the western pacific pattern and associated winter climate anomalies in eurasia and north america |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/joc.6993 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6993 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.6993 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6993 |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
International Journal of Climatology volume 41, issue 4, page 2840-2859 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.6993 |
container_title |
International Journal of Climatology |
container_volume |
41 |
container_issue |
4 |
container_start_page |
2840 |
op_container_end_page |
2859 |
_version_ |
1802641012233863168 |