Significant relationship between Arctic warming and East Asia hot summers

Arctic warming is of growing interest because it could affect midlatitude climates. Even though numerous studies have paid attention to the relationship between Arctic warming and the midlatitude climate in winter, the influence of Arctic warming on the summer conditions has not been examined in dep...

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Bibliographic Details
Published in:International journal of climatology 2022-12, Vol.42 (16), p.9530-9538
Main Authors: Kim, Da‐Seul, Jun, Sang‐Yoon, Lee, Myong‐In, Kug, Jong‐Seong
Format: Article
Language:English
Subjects:
Advection
Air temperature
Anticyclones
Anticyclonic circulation
Arctic climates
Arctic warming
Climate
Climatic conditions
East Asia
Hot summers
Polar environments
Radiation
Seasonal variations
Short wave radiation
Summer
Surface-air temperature relationships
teleconnection
Temperature
Temperature variations
Wave packets
Wave trains
Winter climates
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Summary:Arctic warming is of growing interest because it could affect midlatitude climates. Even though numerous studies have paid attention to the relationship between Arctic warming and the midlatitude climate in winter, the influence of Arctic warming on the summer conditions has not been examined in depth. Here we identify a significant relationship between East Asia hot summers and Arctic warming over the Barents and Kara seas. To represent Arctic warming, we define a combined index by simply differencing the normalized surface air temperature and sea‐ice indices. We found that the combined index in July has significantly high correlations with the temperatures in China, Korea, and Japan. While the teleconnection mechanism is not completely revealed, it is evident that warming over the Barents and Kara seas is accompanied by the local development of an anomalous anticyclone and downstream wave trains, which yield a strong anticyclonic circulation over East Asia and the North Pacific. The anticyclonic circulation persists and intensifies until August, which leads to hot summer conditions in East Asia with warm advection and enhanced shortwave radiation. Our results suggest that Arctic climate conditions can be used as a useful precursor of East Asia temperature variations even in summer. July Arctic temperature variation has significantly high correlations with August temperature variation over East Asia. Warming over the Barents and Kara seas is accompanied by the downstream wave trains, leading to an anticyclonic circulation over East Asia. The anticyclonic circulation persists and intensifies until August, which leads to hot summer conditions in East Asia.
ISSN:0899-8418
1097-0088
DOI:10.1002/joc.7844