Dataparallel Semi-Lagrangian Numerical Weather Forecasting
نویسندگان
چکیده
Different implementations on a massively parallel computer system of a semi-Lagrangian method within the numerical weather forecast model HIRLAM are presented. In principle semi-Lagrangian methods on massively parallel architectures result in irregular communications, i.e., communications between arbitrary processors. It is shown that the fastest implementationincreases the total execution time per time step with an acceptable amount in relation to the advantage of applying a semi-Lagrangian method.
منابع مشابه
Coupled weather research and forecasting–stochastic time-inverted lagrangian transport (WRF–STILT) model
This paper describes the coupling between a mesoscale numerical weather prediction model, the Weather Research and Forecasting (WRF) model, and a Lagrangian Particle Dispersion Model, the Stochastic Time-Inverted Lagrangian Transport (STILT) model. The primary motivation for developing this coupled model has been to reduce transport errors in continental-scale top– down estimates of terrestrial...
متن کاملparticle - mesh semi - Lagrangian advection scheme
We describe the remapped particle-mesh method, a new mass-conserving method for solving the density equation which is suitable for combining with semi-Lagrangian methods for compressible flow applied to numerical weather prediction. In addition to the conservation property, the remapped particle-mesh method is computationally efficient and at least as accurate as current semi-Lagrangian methods...
متن کاملLagrangian Coherent Structures near a Subtropical Jet Stream
Direct Lyapunov exponents and stability results are used to extract and distinguish Lagrangian coherent structures (LCS) from a three-dimensional atmospheric dataset generated from the Weather Research and Forecasting (WRF) model. The numerical model is centered at 19.788N, 155.558W, initialized from the Global Forecast System for the case of a subtropical jet stream near Hawaii on 12 December ...
متن کاملA mass-conserving and multi-tracer efficient transport scheme in the online integrated Enviro-HIRLAM model
In this paper a new advection scheme for the online coupled chemical–weather prediction model EnviroHIRLAM is presented. The new scheme is based on the locally mass-conserving semi-Lagrangian method (LMCSL), where the original two-dimensional scheme has been extended to a fully three-dimensional version. This means that the three-dimensional semi-implicit semi-Lagrangian scheme which is current...
متن کاملGlobal semi-Lagrangian advection
In the recent years, many international centers for numerical weather prediction and climate modeling have adopted in their operational codes a semiLagrangian scheme for transport. This numerical technique became very popular due to its stability and accuracy properties. The time step is only restricted by accuracy and not by a CFL stability condition. In a joint effort with CPTEC/INPE (the Bra...
متن کامل