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Upper-ocean stratification changes control ENSO amplitude shift under sustained global warming.

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Climate models show El Niño-Southern Oscillation (ENSO) amplitude shifts under high emissions. This study identifies ocean stratification changes as the primary driver of these ENSO dynamics, offering a new framework for analysis.

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Area of Science:

  • Climate Science
  • Oceanography
  • Atmospheric Science

Background:

  • Climate models project non-monotonic amplitude shifts in the El Niño-Southern Oscillation (ENSO) under high emission scenarios.
  • The specific drivers behind these projected ENSO amplitude changes remain inadequately understood.
  • Understanding ENSO variability is crucial for predicting future climate patterns and impacts.

Purpose of the Study:

  • To develop a mechanistic framework for quantifying the drivers of ENSO amplitude shifts in climate model projections.
  • To investigate the role of ocean stratification and mean-state climatologies in modulating ENSO dynamics.
  • To disentangle the impacts of global warming on ENSO behavior.

Main Methods:

  • Utilized an intermediate coupled model (ICM) incorporating mean-state oceanic climatologies from eight climate models across three time periods.
  • Applied vertical baroclinic mode decomposition to ocean density to extract wind projection coefficients (pn) governing ocean dynamics.
  • Conducted sensitivity experiments to isolate the influence of stratification on ENSO.

Main Results:

  • The ICM successfully reproduced the non-monotonic ENSO amplitude shifts projected by climate models.
  • Opposite changes in wind projection coefficients p1 and p2 after 2140 were identified as the primary drivers of these shifts.
  • Ocean stratification was confirmed as the dominant modulator of ENSO dynamics in the projections.

Conclusions:

  • A coherent mechanistic framework was established to analyze ENSO changes under global warming.
  • Ocean stratification plays a critical role in modulating ENSO amplitude shifts in future climate projections.
  • This research provides key insights into the physical mechanisms driving ENSO variability in a warming world.