Enhanced impact of the Aleutian Low on increasing the Central Pacific ENSO in recent decades ...

• Main Authors: Chen, S, Chen, W, Yu, B, Wu, R, Graf, HF, Chen, L
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer Science and Business Media LLC 2023
• Subjects: 37 Earth Sciences; 3708 Oceanography; 3702 Climate Change Science; 13 Climate Action; Pacific; aleutian low
• Online Access: https://dx.doi.org/10.17863/cam.95689; https://www.repository.cam.ac.uk/handle/1810/348272

Acknowledgements: We thank three anonymous reviewers for their constructive suggestions, which helped to improve the paper. This study was supported jointly by the National Natural Science Foundation of China (Grants 42175039, 42205021 and 42005020) and the Jiangsu Collaborative Innovation Center for Climate Change. ... : AbstractIn this study, we reveal a marked enhanced impact of the early-spring Aleutian Low (AL) on the following winter El Niño and Southern Oscillation (ENSO) after the late-1990s. This enhanced impact of the early-spring AL may have an important contribution to the increased emergence of the central Pacific ENSO during recent decades. After the late-1990s, decrease (increase) in the early-spring AL strength tends to induce an anomalous cyclone (anticyclone) over subtropical North Pacific via wave-mean flow interaction. The associated westerly (easterly) wind anomalies to the south side of the subtropical anomalous cyclone (anticyclone) over the tropical western Pacific contribute to occurrence of central Pacific-like El Niño (La Niña) in the following winter via tropical Bjerknes feedback. Further, the subtropical anomalous cyclone (anticyclone) leads to sea surface temperature (SST) increase (decrease) in the equatorial Pacific in the following summer via wind-evaporation-SST (WES) feedback, which further ...