gWRF Workflow and Input Data Requirements Academia Sinica Grid Computing Center, Taiwan April, 2015

WRF: Weather Research and Forecasting Model Overview WRF: Weather Research and Forecasting Model A compressible, non-hydrostatic, Euler equation and mesoscale numerical weather prediction (NWP) system. Open source, support parallel computation Principally developed by NCAR, NCEP etc. Workflow Get Data From Website (Geo-Data and Meteorol Data) Pre-Processing Data (Domain Wizard) gWRF ( Run the WRF and Visualization) Ref . WRF User Page

Sec. 1 Sec. 2 Sec. 3 Sec. 4 Ref : http://www.mmm.ucar.edu/wrf/users/ GRIB-formatted files(General Regularly-distributed Information in Binary form) Real : reads input data from WPS compute dry surface pressure, model levels, and vertically interpolate data compute reference temperature profile verify soil categories, land use, land mask, soil temperature, sea surface temperature are all consistent with each other 3D boundary data are coupled with map factors Ref : http://www.mmm.ucar.edu/wrf/users/

WRF Prerocessing System (WPS) Prepare input to the real program for real-data simulations. A set of three programs, each perform one stage geogrid.exe: defines model domains and interpolates static geographical (terristrial) data to the grids ungrib.exe: Extracts meteorological fields from GRIB files metgrid.exe: horizontally interpolates the meteorological fields from ungrib to the model grids defined by geogrid Ref gLite-3.2 User Guide

namelist.wps Define domain parameters: Number of domain Start, end date Geo data resolution Grid plan, projection type … Ref gLite-3.2 User Guide

Data flow in WPS Ref gLite-3.2 User Guide

Input Data for WRF Simulation Observations … (Optional) Terrian, Landuse and Soil types … WRF Provide (30’’, 2’, 5’ and 10’) : http://www.mmm.ucar.edu/wrf/users/ Pressure, Temp., Ozone, Wind speed, Humidity and Heat flux … (Time-varying meteorological fields) Free GRIB datasets from NCAR: http://www.mmm.ucar.edu/wrf/users/download/free_data.html Ref : http://www.taiga.net/nce/

Pre-processing WRF Processing Terrestrial Data Gridded Data http://www.mmm.ucar.edu/wrf/OnLineTutorial/Basics/GEOGRID/ter_data.htm Gridded Data http://www.mmm.ucar.edu/wrf/users/download/free_data.html Tool : Domain Wizard http://wrfportal.org/DomainWizard.html

WRF Post-processing WRF Processing ARW model (cluster computing) gWRF (grid computing) https://gwrf.twgrid.org Post-processing GrADS

Gribbed Data

Select data which you need

Domain Wizard

The remote computer SSH to remote computer WPS Programs Geography Database

Data Prepare

Run WRF on gWRF

Build up the simulation

Get the Status