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Particle-Based Tracking of Cold Pool Gust Fronts.

Olga Henneberg1, Bettina Meyer1, Jan O Haerter1

  • 1Niels Bohr Institute University of Copenhagen Copenhagen Denmark.

Journal of Advances in Modeling Earth Systems
|July 28, 2020
PubMed
Summary
This summary is machine-generated.

A new method reliably tracks convective cold pool (CP) gust fronts in simulations. This technique aids in understanding how these gust fronts trigger new storms and interact with each other.

Keywords:
cold poolsconvectionlarge eddy simulationsprecipitationself‐organizationtracking

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Area of Science:

  • Atmospheric Science
  • Meteorology
  • Computational Fluid Dynamics

Background:

  • Gust fronts of convective cold pools (CPs) are key triggers for new convective cells.
  • Tracking these gust fronts in high-resolution simulations like large eddy simulations (LES) has been challenging, limiting mechanistic analysis of CP interactions.

Purpose of the Study:

  • To develop and validate a simple yet effective method for tracking CP gust fronts in high-resolution atmospheric simulations.
  • To enable detailed analysis of gust front dynamics and their role in triggering subsequent convection.

Main Methods:

  • A novel tracking method using horizontal advection and horizontal divergence conditions.
  • Emitting tracers at the perimeter of surface precipitation patches to mark the CP boundary.
  • Testing the method on idealized single CPs and a population of CPs during a midlatitude diurnal cycle.

Main Results:

  • The method reliably transports tracers to the gust front, forming closed bands that clearly delineate the CP boundary.
  • Analysis along the gust front identified point-like regions of significant updrafts.
  • Successful tracking of both isolated and multiple CPs in complex simulations.

Conclusions:

  • The developed tracer-based method provides a robust way to track CP gust fronts in LES data.
  • This technique facilitates the study of gust front dynamics and their role in convective initiation and interaction.
  • The method's ability to link tracers to parent precipitation cells offers new avenues for analyzing evolving CP populations.