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El Niño-Southern Oscillation frequency cascade
Malte F Stuecker1, Fei-Fei Jin2, Axel Timmermann3
1Department of Atmospheric Sciences, University of Hawai'i at Mānoa, Honolulu, HI 96822; stuecker@soest.hawaii.edu.
Summary
The El Niño-Southern Oscillation (ENSO) interacts with the annual cycle, creating predictable climate patterns. This interaction generates deterministic high-frequency variability in atmospheric circulation, impacting weather systems like the East Asian Monsoon.
Area of Science:
- Climate Science
- Atmospheric Dynamics
- Meteorology
Background:
- The El Niño-Southern Oscillation (ENSO) is a major driver of global climate variability on interannual timescales.
- ENSO's interaction with the annual cycle is particularly strong in the tropical Western Pacific.
- This interaction influences regional climate patterns, including the East Asian Monsoon.
Purpose of the Study:
- To investigate the nonlinear interaction between ENSO and the annual cycle.
- To identify the resulting atmospheric circulation patterns and their predictability.
- To understand the impact of these interactions on the Northwest Pacific anticyclone and East Asian Monsoon.
Main Methods:
- Utilized climate model experiments to simulate ENSO-annual cycle interactions.
- Conducted observational analysis to validate model findings.
- Analyzed atmospheric circulation data, focusing on the Northwest Pacific anticyclone.
Main Results:
- Demonstrated that the ENSO-annual cycle interaction causes a frequency cascade in atmospheric circulation.
- Identified deterministic high-frequency variability on near-annual and subannual timescales.
- Showed that a significant portion of Northwest Pacific anticyclone variability is explained by these interactions.
Conclusions:
- The nonlinear interaction between ENSO and the annual cycle leads to predictable, high-frequency atmospheric variability.
- This variability is a key factor in understanding the dynamics of the Northwest Pacific anticyclone.
- Findings suggest improved predictability for the East Asian Monsoon system through understanding these deterministic interactions.
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