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Upper-tropospheric bridging of wintertime surface climate variability in the Euro-Atlantic region and northern Asia

A remarkable feature of interannual climate variability is a robust link of wintertime anomalies of surface air temperature (SAT) in northern Asia to pan-Atlantic SAT variations associated with the North Atlantic Oscillation (NAO). Here statistical analyses of data from the era of satellite observat...

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Autor principal: Schlichtholz, Pawel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6787261/
https://www.ncbi.nlm.nih.gov/pubmed/31601851
http://dx.doi.org/10.1038/s41598-019-51019-w
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author Schlichtholz, Pawel
author_facet Schlichtholz, Pawel
author_sort Schlichtholz, Pawel
collection PubMed
description A remarkable feature of interannual climate variability is a robust link of wintertime anomalies of surface air temperature (SAT) in northern Asia to pan-Atlantic SAT variations associated with the North Atlantic Oscillation (NAO). Here statistical analyses of data from the era of satellite observations (1979–2017) are used to show that about 80% of the variance of the winter (December-March) mean area-averaged SAT anomalies in northern Asia can be explained by the anomalous surface circulation associated with an NAO-like mode of sea level pressure variability over extratropical Eurasia. These SAT anomalies are related equally strongly to the “Lake Baikal” vortex representing variations of the upper-tropospheric circulation over northern Asia. Support is given for the scenario that this vortex drives SAT anomalies in northern Asia via surface-reaching displacements of isentropic surfaces and that it is coupled to climate variability in the Euro-Atlantic sector via interactions between the North Atlantic storm track, quasi-stationary planetary waves, and zonal-mean zonal winds. The results underpin the importance of a lesser-known zonal wavenumber-3 structure of disturbances trapped over Eurasia by the polar front jet rather than the better-known zonal wavenumber-5 structure of disturbances trapped by the subtropical jet for NAO teleconnections.
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spelling pubmed-67872612019-10-17 Upper-tropospheric bridging of wintertime surface climate variability in the Euro-Atlantic region and northern Asia Schlichtholz, Pawel Sci Rep Article A remarkable feature of interannual climate variability is a robust link of wintertime anomalies of surface air temperature (SAT) in northern Asia to pan-Atlantic SAT variations associated with the North Atlantic Oscillation (NAO). Here statistical analyses of data from the era of satellite observations (1979–2017) are used to show that about 80% of the variance of the winter (December-March) mean area-averaged SAT anomalies in northern Asia can be explained by the anomalous surface circulation associated with an NAO-like mode of sea level pressure variability over extratropical Eurasia. These SAT anomalies are related equally strongly to the “Lake Baikal” vortex representing variations of the upper-tropospheric circulation over northern Asia. Support is given for the scenario that this vortex drives SAT anomalies in northern Asia via surface-reaching displacements of isentropic surfaces and that it is coupled to climate variability in the Euro-Atlantic sector via interactions between the North Atlantic storm track, quasi-stationary planetary waves, and zonal-mean zonal winds. The results underpin the importance of a lesser-known zonal wavenumber-3 structure of disturbances trapped over Eurasia by the polar front jet rather than the better-known zonal wavenumber-5 structure of disturbances trapped by the subtropical jet for NAO teleconnections. Nature Publishing Group UK 2019-10-10 /pmc/articles/PMC6787261/ /pubmed/31601851 http://dx.doi.org/10.1038/s41598-019-51019-w Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Schlichtholz, Pawel
Upper-tropospheric bridging of wintertime surface climate variability in the Euro-Atlantic region and northern Asia
title Upper-tropospheric bridging of wintertime surface climate variability in the Euro-Atlantic region and northern Asia
title_full Upper-tropospheric bridging of wintertime surface climate variability in the Euro-Atlantic region and northern Asia
title_fullStr Upper-tropospheric bridging of wintertime surface climate variability in the Euro-Atlantic region and northern Asia
title_full_unstemmed Upper-tropospheric bridging of wintertime surface climate variability in the Euro-Atlantic region and northern Asia
title_short Upper-tropospheric bridging of wintertime surface climate variability in the Euro-Atlantic region and northern Asia
title_sort upper-tropospheric bridging of wintertime surface climate variability in the euro-atlantic region and northern asia
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6787261/
https://www.ncbi.nlm.nih.gov/pubmed/31601851
http://dx.doi.org/10.1038/s41598-019-51019-w
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