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Enhanced impact of the Aleutian Low on increasing the Central Pacific ENSO in recent decades by Shangfeng Chen; Wen Chen; Bin Yu; Renguang Wu; Hans-F. Graf; Lin Chen is a Earth and Planetary Sciences article available to read on EtoBox.

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## Abstract In 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 contributes to succeeding central Pacific-like El Niño (La Niña). Enhanced impact of early-spring AL on ENSO is attributable to enhancement of the mean circulation over the

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Author

Shangfeng Chen; Wen Chen; Bin Yu; Renguang Wu; Hans-F. Graf; Lin Chen

Publisher

Springer Science and Business Media LLC

Published

2023

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)