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Congestus Mode Invigoration by Convective Aggregation in Simulations of Radiative-Convective Equilibrium.

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Tropical convection simulations reveal a distinct congestus mode. This mode strengthens with convective aggregation, driven by radiative cooling, impacting the tropical atmosphere.

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Area of Science:

  • Atmospheric Science
  • Climate Modeling
  • Tropical Meteorology

Background:

  • Tropical convection is a key driver of Earth's energy balance.
  • Radiative-convective equilibrium (RCE) models simulate idealized tropical conditions.
  • Understanding convective modes is crucial for climate projections.

Purpose of the Study:

  • To investigate the representation of the congestus mode of tropical convection in numerical simulations.
  • To analyze the relationship between convective aggregation and congestus circulation strength.
  • To elucidate the physical mechanisms driving congestus invigoration.

Main Methods:

  • Analysis of the RCE Model Intercomparison Project (RCEMIP) ensemble.
  • Development and analysis of a new ensemble of 2D RCE simulations.
  • Investigation of radiative and entrainment cooling effects on convection.

Main Results:

  • Approximately half of the RCEMIP models simulate a distinct congestus circulation.
  • Congestus circulation strengthens with increasing convective aggregation in both ensembles.
  • Congestus invigoration is driven by radiative cooling in the upper troposphere, creating a positive feedback loop.

Conclusions:

  • Congestus circulation plays a significant role in the mean RCE atmospheric state.
  • Inconsistent model representation of congestus warrants further investigation.
  • The physical mechanisms driving congestus invigoration have implications for understanding tropical atmospheric dynamics.