Eurasian mid-latitude jet stream bridges an Atlantic to Asia summer teleconnection in heat extremes

Northern Europe and Northeast Asia, which are climatologically mild and temperate in early summer, both witnessed record-breaking heat extremes in June 2023. With a focus on the subseasonal time scale, this study highlights a teleconnected relationship in historical early-summer heat extremes betwee...

Full description

Bibliographic Details
Published in:Environmental Research Letters
Main Authors: Yu Nie, Hong-Li Ren, Jinqing Zuo, Jie Wu, Adam A Scaife, Nick J Dunstone, Steven C Hardiman
Format: Article in Journal/Newspaper
Language:English
Published: IOP Publishing 2024
Subjects:
heat extremes
teleconnection
Rossby wave packet
jet stream
Environmental technology. Sanitary engineering
TD1-1066
Environmental sciences
GE1-350
Science
Q
Physics
QC1-999
North Atlantic
Online Access:https://doi.org/10.1088/1748-9326/ad2eee
https://doaj.org/article/78eef1db769542e79dba0e361d1558f6
Description
Summary:Northern Europe and Northeast Asia, which are climatologically mild and temperate in early summer, both witnessed record-breaking heat extremes in June 2023. With a focus on the subseasonal time scale, this study highlights a teleconnected relationship in historical early-summer heat extremes between Northern Europe and Northeast Asia. By diagnosing the thermal budget and wave activity flux, we show that over one third of historical Northeast Asian heat extremes are initialized by Eurasian mid-latitude Rossby wave packets. The wave packets manifest as strong anticyclonic anomalies over subpolar North Atlantic, cyclonic anomalies over Ural region and anticyclonic anomalies over Northeast Asia, which directly cause coexisting heat extremes in Northern Europe and Northeast Asia. Such wave packets are strongly modulated by the Eurasian jet stream. By carrying out numerical experiments, we further explain why the wave packet is significant in early summer. We find that the quasi-stationary response of the Eurasian midlatitude Rossby wave packets to a specified heating in subpolar North Atlantic is dependent on the background jet structure. In early summer, the double-jet state over Eurasia favors Rossby wave propagation. This is of great practical importance for accurate prediction of Northeast Asian heat extreme amplitude and location.

Similar Items