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Tropical atmospheric circulations with humidity effects.

Chun-Hsiung Hsia1, Chang-Shou Lin2, Tian Ma3

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Summary

Moisture significantly impacts tropical atmospheric circulation by lowering critical thermal thresholds. This study reveals how humidity influences planetary-scale weather patterns and convection scales.

Keywords:
humiditytransitiontropical atmospheric circulation

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Area of Science:

  • Atmospheric Science
  • Climate Dynamics
  • Geophysics

Background:

  • Planetary-scale atmospheric circulation is crucial for global weather patterns.
  • The role of moisture in tropical circulation dynamics requires further investigation.
  • Previous models often simplify humidity's influence on atmospheric heat sources.

Purpose of the Study:

  • To investigate the effect of moisture on tropical atmospheric circulation.
  • To analyze the influence of humidity-dependent heat sources on circulation dynamics.
  • To determine how moisture affects critical parameters like the thermal Rayleigh number.

Main Methods:

  • Utilizing Boussinesq equations coupled with a diffusive humidity equation.
  • Modeling humidity-dependent heat sources via linear approximation.
  • Applying dynamic transition theory for rigorous mathematical analysis.

Main Results:

  • Mixed (random) transitions were identified in the atmospheric model.
  • Turbulent friction terms are necessary for accurate convection scales in tropical circulation.
  • Moisture was found to reduce the critical thermal Rayleigh number magnitude.

Conclusions:

  • Moisture's influence on tropical circulation is significant, primarily by lowering critical thermal parameters.
  • The essential dynamical characteristics of the system remain unchanged by moisture.
  • Accurate modeling of tropical atmospheric circulation necessitates the inclusion of turbulent friction and humidity effects.