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Evolution of Staircase Structures in Diffusive Convection

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Forcing Convection to Aggregate Using Diabatic Heating Perturbations.

Beth Dingley¹, Guy Dagan^1,2, Philip Stier¹

¹Atmospheric, Oceanic and Planetary Physics University of Oxford Oxford UK.

Journal of Advances in Modeling Earth Systems

|October 25, 2021

Summary

Anomalous atmospheric heating from aerosol plumes can increase tropical deep convection aggregation, particularly at lower sea surface temperatures (SSTs). This finding links aerosol pollution to organized convection, impacting weather patterns.

Keywords:

aerosol‐cloud interactions convective organization self‐aggregation tropical convection

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Area of Science:

Atmospheric Science
Climate Dynamics
Aerosol Science

Background:

Tropical deep convection forms large clusters influencing local humidity and precipitation.
Sea surface temperature (SST) gradients are known to organize convection.
The impact of atmospheric diabatic heating perturbations on convective aggregation remains under-investigated.

Purpose of the Study:

To investigate how anomalous diabatic heating, simulated by an idealized aerosol plume, affects convective aggregation.
To explore the underlying mechanisms driving convective aggregation due to aerosol forcing.
To assess the influence of sea surface temperature (SST) on aerosol-induced convective aggregation.

Main Methods:

Idealized simulations of radiative-convective equilibrium in a non-rotating global model.
Introduction of anomalous diabatic heating via an aerosol plume.
Analysis of convective aggregation, thermally driven circulation, and radiative feedbacks.

Main Results:

Aerosol forcing increases the degree of convective aggregation, especially at lower SSTs.
The diabatic heating incites a thermally driven circulation, contributing to aggregation.
Longwave feedbacks are crucial for aggregation at higher SSTs, while shortwave forcing alone can induce aggregation at lower SSTs.

Conclusions:

Aerosol plumes can significantly enhance convective aggregation through induced circulations and radiative anomalies.
The findings provide a link between absorbing aerosol plumes and organized convection, relevant to phenomena like the Indian monsoon.
Aerosol-induced convective aggregation may serve as an analogue for real-world convective organization in polluted regions.