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Roles of ENSO in the Link of the East Asian Summer Monsoon to the Ensuing Winter Monsoon
Author(s) -
Yu Tiantian,
Chen Wen,
Feng Juan,
Hu Kaiming,
Song Lei,
Hu Peng
Publication year - 2021
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1029/2020jd033994
Subject(s) - anticyclone , climatology , rossby wave , geology , monsoon , el niño southern oscillation , atmospheric sciences
The link between the East Asian summer monsoon (EASM) and the ensuing East Asian winter monsoon (EAWM) is investigated. The results found that strong (weak) EASM years are often followed by the strong (weak) EAWM years, demonstrating that the in‐phase EASM to EAWM transition dominate the EASM‐EAWM link. The strong EASM to the strong EAWM transition is established by an anomalous anticyclone over the western North Pacific (WNPAC) in summer and an anomalous cyclone (WNPC) in winter. The weak EASM to the weak EAWM transition is connected by the same way but with the WNPC in summer and the WNPAC in winter. Further studies suggest that ENSO plays a crucial role in the in‐phase EASM to EAWM transition, which forces the transition between the WNPC and WNPAC from summer to winter via inducing Rossby wave responses to the ENSO‐induced convection anomalies. Numerical simulation analysis further confirms the dominant role of ENSO in the in‐phase EASM to EAWM transitions. The asymmetric analysis suggests that the in‐phase EASM to EAWM transition is stronger under El Niño than under La Niña.