Interdecadal variability of the relationship between the East Asian winter monsoon and ENSO |
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Authors: | W Zhou X Wang T J Zhou C Li J C L Chan |
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Institution: | (1) LASG, Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences, Beijing, China;(2) City U-IAP Laboratory for Atmospheric Sciences, Department of Physics and Materials Science, City University of Hong Kong, Hong Kong;(3) Graduate School of the Chinese Academy of Sciences, Beijing, China |
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Abstract: | Summary The authors examine relationships between the East Asian winter monsoon and the ENSO, particularly on the interdecadal timescales.
Based on the analyses of SLP data from 1899 to 1997, the East-Asian winter monsoon index (WMI) is defined as the zonal difference
of SLP between ∼120° E and ∼160° E. It is found that 18 out of 28 strong winter monsoon years are either before the development
of an El Ni?o or during the decaying La Ni?a event, 12 out of 28 weak winter monsoon are before the development of a La Ni?a
or during the decaying El Ni?o event. There is a significant positive correlation coefficient value of about 0.49 between
the normalized 11-yr running mean of WMI and ENSO index, however, the WMI-ENSO relationship is not consistently highly correlated.
The temporal evolution of correlation between WMI and ENSO indices in both 11-yr and 21-yr moving window shows that the WMI-ENSO
relationship clearly undergo low-frequency oscillation. Obviously, both observational and IPSL air-sea coupled modeling WMI
index has a near-decadal peak with PDO timescales and internal peaks with ENSO timescales by applying the Multitaper method.
Moreover, the cross wavelet and wavelet coherence analysis of WMI/ENSO indicate that there is a larger significant sections
with an in phase behavior between WMI and ENSO at period of 20–30 yrs, suggesting that the interdecadal variation of the WMI-ENSO
relationship might exist. |
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