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Weather Research & Forecasting: A General Overview

Weather Research & Forecasting: A General Overview. HPC Symposium 2014, IIT Madras Tabish U Ansari MS – Environmental Engineering Department of Civil Engineering, IIT Madras. The WRF Model.

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Weather Research & Forecasting: A General Overview

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  1. Weather Research & Forecasting: A General Overview HPC Symposium 2014, IIT Madras Tabish U Ansari MS – Environmental Engineering Department of Civil Engineering, IIT Madras

  2. The WRF Model • State of the art atmospheric simulation system- portable and efficient on available parallel computing platforms • Broad range of applications across scales: Idealized simulations (LES, baroclinic waves) • Parameterization research • Data Assimilation research • Forecast research/ Realtime NWP • Hurricane research • Regional climate research • Coupled model applications • Teaching

  3. Components of the WRF modelling system • The WRF preprocessing system • WRF-Var • ARW solver • Post-processing & vizualization tools

  4. WPS • Defining simulation domains • Interpolating terrestrial data (terrain, landuse, soil categories etc.) • Degribbing and interpolating meteorological data from another model to this simulation domain

  5. WRF Solver • Several initialization programs for idealized and real data simulations and the numerical integration program • Fully compressible non hydrostatic equations • Regional and global applications • Map projection terms • Arakawa C-grid staggering • Rungekutta 2nd and 3rd order time integration options • Scalar conserving flux form for prognostic variables • 2nd to 6th order advection options (horizontal and vertical) • Lateral boundary conditions • Full Physics options for Land surface, PBL, radiation, microphysics and cumulus convection • A single layer ocean mixed model

  6. Post Processing

  7. Supported combinations of hardware and software

  8. The WRF model may be built to run on: • Asingle-processor machine • Ashared-memory machine (that uses the OpenMP API) • A distributed memory machine (with the appropriate MPI libraries), or on a distributed cluster (utilizing both OpenMP and MPI) • The WRFDA and WPS packages run on the above-listed systems

  9. Required compilers and scripting languages • The majority of the WRF model, WPS, and WRFDA codes are written in Fortran90 • The software layer, RSL, which sits between WRF and WRFDA, and the MPI interface is written in C • WPS makes direct calls to the MPI libraries for distributed memory message passing • There are also ancillary programs that are written in C to perform file parsing and file construction, which are required for default building of the WRF modeling code • Additionally, the WRF build mechanism uses several scripting languages: including perl, Cshell and Bourne shell • The traditional UNIX text/file processing utilities are used: make, m4, sed, and awk

  10. It’s free, check it out today! http://www.mmm.ucar.edu/wrf/users/downloads.html

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