Events

 
Colloquium

Detailed modelling of turbulent clouds and their environment with a parcel-based Lagrangian approach

Tuesday, 13 July 2021, 15:15-16:15
online

Lagrangian flow trajectories are a ubiquitous tool in atmospheric and oceanographic science. These trajectories are used to analyse dynamical and mixing processes, but also to study e.g. chemistry and construct detailed case studies for Large-Eddy Simulation. However, a Lagrangian perspective can also be useful for solving the equations of motion. In this talk, I will discuss collaborative work to go beyond the semi-Lagrangian approach (which uses a Lagrangian framework for advection, but is still largely grid-based) and build a geophysical model based entirely around Lagrangian parcels.

 

The parcels in this Moist Parcel-In-Cell (MPIC) model represent both the thermodynamic and the dynamical prognostic properties of the flow. An efficient grid-based solver calculates parcel advection velocities. The Lagrangian approach of MPIC has a number of advantages: thermodynamic/tracer properties and their correlations are naturally conserved, and the amount of mixing between parcels can be explicitly controlled. I will present results demonstrating the performance of MPIC relative to the Met Office/NERC cloud model for an individual convective cloud, and talk about ongoing work to address the challenges in applying this method to more realistic case studies.

 

* Work with David Dritschel (University of St Andrews), Alan Blyth (University of Leeds), Doug Parker (University of Leeds), Matthias Frey (University of St Andrews) and Gordon Gibb (EPCC).

This event is part of the eventgroup Meteorology Colloquium Karlsruhe
Speaker
Dr. Steven Boeing

University of Leeds, UK
Organizer
IMK-TRO
Institute of Meteorology and Climate Research
KIT
Wolfgang-Gaede-Str. 1
76131 Karlsruhe
Tel: 0721 608 43356
Mail: imk-tro does-not-exist.kit edu
https://www.imk-tro.kit.edu
Service-Menu