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Arctic-Eurasian climate linkage induced by tropical ocean variability
1Faculty of Environmental Earth Science, Hokkaido University, Kita 10 Nishi 5, Kita-ku, Sapporo, 060-0810, Japan. matsusnj@ees.hokudai.ac.jp.
Nature Communications
|August 3, 2019
Summary
Cold Eurasian winters are linked to tropical ocean warming and Arctic sea ice changes. El Niño
Area of Science:
- Climate Science
- Atmospheric Science
- Oceanography
Background:
- The Eurasian continent has faced colder winters in recent decades, contrasting with Arctic warming trends.
- Previous research debated whether Arctic sea-ice loss or atmospheric internal variability caused these cold winters.
Purpose of the Study:
- To investigate the combined influence of tropical ocean teleconnections and Arctic sea ice on Eurasian climate.
- To elucidate the mechanisms driving the linkage between Arctic and Eurasian climate patterns.
Main Methods:
- Analysis of climate data to identify atmospheric teleconnection patterns.
- Investigating the role of tropical ocean conditions, specifically El Niño and La Niña events.
- Examining the impact of Arctic sea ice variations on Eurasian weather patterns.
Main Results:
- Tropical Atlantic warming, persisting from El Niño decay, induces Rossby waves that influence Eurasia.
- This teleconnection leads to increased Arctic sea ice and subsequent Eurasian warming.
- La Niña events show reversed effects, contributing to colder Eurasian winters.
Conclusions:
- The interplay between tropical ocean teleconnections and Arctic sea ice is crucial for Eurasian climate.
- Recent tropical Pacific cooling and Arctic sea-ice loss likely contribute to frequent cold Eurasian winters.
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