Teleconnection Dynamics in East Asian Summer Climate

Teleconnection dynamics underpin the large‐scale circulation anomalies that regulate the East Asian summer climate, including monsoonal rainfall, heatwaves and droughts. Key features comprise the East Asian jet stream, the Western North Pacific subtropical high, and the seasonal evolution of the East Asian summer monsoon. These features are modulated by remote drivers such as Atlantic sea‐surface temperature variability, the North Atlantic Oscillation, and tropical intraseasonal oscillations. Interaction between these drivers and regional land–atmosphere processes establishes wave trains and pressure anomalies that propagate from Europe and the North Atlantic across Siberia into East Asia. Such cross‐basin linkages enhance predictability on subseasonal to decadal timescales and influence extremes by altering moisture transport and upper‐level forcing. Improved understanding of these pathways supports more reliable seasonal forecasts and informs adaptation strategies for agricultural, water‐resource and disaster‐risk management in East Asia.

Research from Nature Portfolio

Recent studies report a marked increase in interannual variability of the summertime East Asian jet, driven primarily by a preceding winter seesaw in the North Atlantic that operates via a cross‐seasonal ocean–atmosphere bridge. This finding clarifies a substantial role for unforced natural variability in shaping recent extremes of heat and monsoonal rainfall. Complementary work on tropical intraseasonal variability has demonstrated that phases of the Madden–Julian Oscillation exert a strong influence on the intensity and latitudinal position of the Western North Pacific subtropical high, with lower‐latitude displacement amplifying summer precipitation over East Asia. Ensemble‐based emergent constraint methods applied to the subtropical high reveal that intermodel biases in sea‐surface temperature patterns in the tropical Pacific control projections of future monsoon rainfall and heatwave frequency, leading to a robust expectation of intensified subtropical high activity under high‐emission scenarios.

Teleconnection Dynamics in East Asian Summer Climate publication trend

The graph below shows the total number of articles in teleconnection dynamics in east asian summer climate across all publications each year (not limited to Nature Index journals).

Technical terms

Teleconnection: A climate anomaly related to another anomaly at large distances, often linked by atmospheric wave propagation.

East Asian jet (EAJ): A strong upper‐tropospheric westerly wind band that governs midlatitude circulation over East Asia in summer.

Western North Pacific subtropical high (WNPSH): A persistent summer anticyclonic circulation over the western Pacific that steers monsoon rainfall and typhoons.

Madden–Julian Oscillation (MJO): A tropical intraseasonal fluctuation of convection and circulation that influences monsoon variability and subtropical highs.

Atlantic multidecadal variability (AMV): A basin‐scale mode of Atlantic sea‐surface temperature variability on decadal timescales affecting global teleconnections.

References

1. Atlantic origin of the increasing Asian westerly jet interannual variability. Nature Communications (2024).
2. Role of Madden–Julian Oscillation in predicting the 2020 East Asian summer precipitation in subseasonal-to-seasonal models. Scientific Reports (2024).
3. Emergent constraints on future projections of the western North Pacific Subtropical High. Nature Communications (2020).
4. The significant influence of the Atlantic multidecadal variability to the abrupt warming in Northeast Asia in the 1990s. npj Climate and Atmospheric Science (2024).
5. Combined impact of summer NAO and northern Russian shortwave cloud radiative effect on Eurasian atmospheric circulation. Environmental Research Letters (2023).