Angulo‐Umana et al. (2025) Multiscale Convective Circulations and Scale Interactions in a Global Storm‐Resolving Model

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Identification

• Journal: Journal of Advances in Modeling Earth Systems
• Year: 2025
• Date: 2025-12-29
• Authors: Pedro Angulo‐Umana, Daehyun Kim, Peter N. Blossey, Marat Khairoutdinov
• DOI: 10.1029/2025ms005032

Research Groups

This study uses a 40-day global storm-resolving model simulation at 4 km resolution to characterize and examine the relationship between large-scale (100 km) and small-scale tropical convective circulations. It finds that large-scale circulations evolve systematically, constraining embedded small-scale circulations, with tropical anvil clouds mediating deep convection's upscale influence.

Objective

• To understand the relationship between large-scale (100 km) tropical atmospheric motions and small-scale convective circulations.

Study Configuration

• Spatial Scale: Global domain; large-scale motions characterized over tropical domains of approximately 100 km; small-scale motions resolved at 4 km horizontal resolution.
• Temporal Scale: 40 days.

Methodology and Data

• Models used: A global storm-resolving model (specific name not provided).
• Data sources: Output from the global storm-resolving model simulation.

Main Results

• Simulated large-scale circulations tend to evolve systematically, qualitatively resembling the canonical evolution of tropical convective systems (progressing from weak widespread subsidence, to shallow ascent/congestus clouds, to deep convection, to top-heavy stratiform anvils, and finally returning to a suppressed state).
• The structure of the large-scale vertical motions strongly constrains the shape of the embedded small-scale circulations.
• Tropical anvil clouds are identified as mediators of deep convection's up-scale influence on changes in the large-scale circulation.

Contributions

• Provides a simultaneous characterization of large-scale (100 km) and small-scale (4 km) tropical convective circulations using a global storm-resolving model.
• Demonstrates the systematic evolution of large-scale tropical circulations and their constraining effect on embedded small-scale circulations.
• Identifies the crucial role of tropical anvil clouds in mediating the upscale influence of deep convection on large-scale circulation changes.

Funding

Citation

@article{AnguloUmana2025Multiscale,
  author = {Angulo‐Umana, Pedro and Kim, Daehyun and Blossey, Peter N. and Khairoutdinov, Marat},
  title = {Multiscale Convective Circulations and Scale Interactions in a Global Storm‐Resolving Model},
  journal = {Journal of Advances in Modeling Earth Systems},
  year = {2025},
  doi = {10.1029/2025ms005032},
  url = {https://doi.org/10.1029/2025ms005032}
}