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A multiscale model for tropical intraseasonal oscillations.

Andrew J Majda1, Joseph A Biello

  • 1Courant Institute of Mathematical Sciences, Center for Atmosphere and Ocean Sciences, New York University, 251 Mercer Street, New York, NY 10012, USA. jonjon@cims.nyu.edu

Proceedings of the National Academy of Sciences of the United States of America
|March 27, 2004
PubMed
Summary

A new multiscale model explains the tropical intraseasonal oscillation (TIO). Organized synoptic-scale circulations generate planetary-scale TIO through energy transfer.

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Area of Science:

  • Atmospheric Science
  • Climate Dynamics
  • Meteorology

Background:

  • The tropical intraseasonal 40- to 50-day oscillation (TIO) is a major driver of tropical atmospheric variability.
  • Planetary-scale circulations associated with TIO arise from complex multiscale processes.

Purpose of the Study:

  • To develop a new multiscale model that elucidates the generation mechanisms of TIO.
  • To demonstrate how synoptic-scale circulations contribute to planetary-scale TIO.

Main Methods:

  • Development of a novel multiscale model with mathematical underpinnings.
  • Analysis of upscale energy transfer from synoptic to planetary scales.
  • Comparison of model-generated circulations with observational data of TIO and superclusters.

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Main Results:

  • The model successfully replicates key features of the observed TIO.
  • Upscale transfer of kinetic and thermal energy from synoptic-scale wave trains generates planetary circulations.
  • Vertically tilted synoptic-scale circulations play a crucial role in TIO generation.

Conclusions:

  • Organized synoptic-scale circulations are central to generating planetary circulations resembling the TIO.
  • The developed multiscale model offers a transparent and analytically tractable framework for understanding TIO.