Joint Seminar: New perspectives on El Niño dynamics and Indo-Pacific climate variability

Nonlinear interactions between the El Niño-Southern Oscillation (ENSO) and the Western Pacific warm pool annual cycle generate an atmospheric combination mode (C-mode) of atmospheric circulation variability. Using a framework of general circulation model experiments forced with an idealized sinusoidal ENSO temporal evolution allows us to show that ENSO’s impacts are not limited to ENSO’s intrinsic interannual periodicity. Instead, a deterministic frequency cascade mechanism transfers a considerable fraction of ENSO’s power to near-annual and sub-annual timescales. We demonstrate that this high-frequency variability has large impacts for instance on the East Asian monsoon system and discuss the implications for seasonal predictions. Importantly, this framework can be applied in general to study seasonally modulated climate variability in the climate system.




15:15 Uhr


Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg


Malte F. Stuecker, University of Hawaii, USA


Tatiana Ilyina

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