Amplified waveguide teleconnections along the polar front jet favor summer temperature extremes over northern Eurasia

Peiqiang Xu, Lin Wang, Geoffrey K. Vallis, Ruth Geen, James A. Screen, Peili Wu, Shuoyi Ding, Ping Huang, Wen Chen

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Abstract

An apparent increase in the frequency of summer temperature extremes over northern Eurasia has been observed in the past decade. Some of these high-impact events were associated with amplified waveguide teleconnections embedded in the polar front jet, but it remains unclear if extreme temperatures are robustly and routinely related to amplified waves along the polar front jet. This study systematically examines relationships between planetary wave activity and temperature extremes using observations, reanalysis, and large-ensemble simulations from multiple climate models. Months with extreme temperatures over northern Eurasia generally have amplified wave activity along the polar front jet, whereas months with near-average temperatures tend to have attenuated wave activity. Waveguide teleconnections are particularly amplified during extremely hot and cold summer months over eastern Europe and western Russia. These findings demonstrate the important role of waveguide teleconnections along the polar front jet in generating regional temperature extremes over northern Eurasia.
Original languageEnglish
Article numbere2021GL093735
Number of pages9
JournalGeophysical Research Letters
Volume48
Issue number13
Early online date19 Jun 2021
DOIs
Publication statusPublished - 16 Jul 2021
Externally publishedYes

Bibliographical note

Funding Information:
The authors thank the two anonymous reviewers for their insightful comments that led to significant improvement of the paper. P. Xu and L. Wang were supported by the National Natural Science Foundation of China (41925020, 42005057), the China Postdoctoral Science Foundation (2020M670418), and the Special Research Assistant Project of the Chinese Academy of Sciences. G. K. Vallis, R. Geen, and P. Wu were supported by the UK‐China Research and Innovation Partnership Fund, through the Met Office Climate Science for Service Partnership (CSSP) China, as part of the Newton Fund. J. A. Screen was supported by the NERC grant NE/P006760/1. Part of the work was performed when P. Xu visited the University of Exeter under the support of the CSSP‐China project.

Funding Information:
The authors thank the two anonymous reviewers for their insightful comments that led to significant improvement of the paper. P. Xu and L. Wang were supported by the National Natural Science Foundation of China (41925020, 42005057), the China Postdoctoral Science Foundation (2020M670418), and the Special Research Assistant Project of the Chinese Academy of Sciences. G. K. Vallis, R. Geen, and P. Wu were supported by the UK-China Research and Innovation Partnership Fund, through the Met Office Climate Science for Service Partnership (CSSP) China, as part of the Newton Fund. J. A. Screen was supported by the NERC grant NE/P006760/1. Part of the work was performed when P. Xu visited the University of Exeter under the support of the CSSP-China project.

Publisher Copyright:
© 2021. American Geophysical Union. All Rights Reserved.

ASJC Scopus subject areas

  • Geophysics
  • General Earth and Planetary Sciences

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