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Jordan G. Powers Mesoscale and Microscale Meteorology Division NCAR Earth System Laboratory

Management of a Community Model: The WRF Effort at NCAR. Jordan G. Powers Mesoscale and Microscale Meteorology Division NCAR Earth System Laboratory National Center for Atmospheric Research Space Weather Workshop April 19, 2013. NCAR-Supported Community Atmospheric Model: WRF.

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Jordan G. Powers Mesoscale and Microscale Meteorology Division NCAR Earth System Laboratory

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  1. Management of a Community Model: The WRF Effort at NCAR Jordan G. Powers Mesoscale and Microscale Meteorology Division NCAR Earth System Laboratory National Center for Atmospheric Research Space Weather Workshop April 19, 2013

  2. NCAR-Supported Community Atmospheric Model: WRF • WRF= Weather Research and Forecasting Model ‒ A numerical atmospheric model designed for: ◊ Research ◊ Operational weather forecasting ‒ Community model ◊ Free software with development from a variety of contributors ◊ Leveraged resource: Individual users benefit from the contributions of many others

  3. WRF Applications • Meteorological research • Numerical weather prediction (NWP) • Regional climate research • Atmospheric chemistry and air quality forecasting • Teaching WRF Hurricane Forecasting at NCAR Hurricanes Leslie and Michael 36-hr forecast: Valid 9/8/12 1800 UTC Reflectivity 36-km grid Model forecast grids: 36-km / 12km / 4 km

  4. WRFDA: U (m/s) AnalysisBackground WRF System Elements & Coupled Models • WRFDA— WRF Data Assimilation System – Purpose: Ingest of observations into simulation • WRF-Chem—Coupled atmospheric chemistry • WRF-Hydro— Coupled hydrology model • WRF-Fire—Wildland fire model • Global WRF—Structuring of WRF to run over globe 8-22-08 12 UTC, Level 15 WRF-Chem 36-h Ozone (27-km )

  5. WRF Support by NCAR: Background • December 2000: First release of WRF • WRF provided freely and in public domain • “WRF” — Trademarked by UCAR • WRF available via web download – Requirement: No-cost registration – Registration: Name, e-mail, affiliation, location, WRF application – Purposes (i) Statistics/info on usage / user base (ii) WRF news subscription

  6. WRF User Participation Registered Users U.S. Universities, Gov’tlabs, Private sector 6782 Foreign users 14775 21557 Countries represented: 152 WRF Registered Users: 2000–2013 7246: Active subscribers to wrf-news@ucar.edu

  7. Worldwide WRF User Participation  152 Countries

  8. WRF Community Model Support Activities 1) User Services (i) Provide user assistance—425 inquiries / month (ii) Tutorials – 2 / yr at NCAR (and other international venues) (iii) Annual WRF Users’ Workshop at NCAR – 2012 wokshop attendance: 240 2) Maintenance of WRF Repository (WRF code) 3) Oversight / Issuance of Releases

  9. WRF User Support Utilities • WRF Users’ Page http://www.mmm.ucar.edu/wrf/users – WRF news and events – Model software and documentation – Online tutorial http:www.mmm.ucar.edu/wrf/OnLineTutorial/index.htm – WRF Users’ Forum • User assistance service: wrfhelp@ucar.edu

  10. Supporting the WRF Community Model: Experiences / Lessons Learned • Success in Model Growth: Factors 1) Model quality and capabilities: Reliable and suitable for a wide range of research 2) Open, non-proprietary code 3) Ease of use and code modification 4) Software portability and scalability 5) Large community →Encourages new users

  11. Supporting the WRF Community Model: Experiences / Lessons Learned (cont’d) • Large User Community: Positive Feedback 1) Attractiveness to prospective users → Further growth of user base 2) More potential developers →Accelerates improvement of system 3) More earth system models coupled to WRF → Greater participation of users in other disciplines and communities 4) Increases educational uses → Grad student exposure → More future users

  12. Supporting the WRF Community Model: Experiences / Lessons Learned (cont’d) • Large User Community: Positive Effects 5) More use → More evaluation → Acceleration of developments and improvements 6) Greater publication history → Greater acceptance by new users and scientific community

  13. Supporting the WRF Community Model: Experiences / Lessons Learned (cont’d) • Challenges Overall issue: Adequate funding for personnel to provide system support 1) Servicing volume of help requests (425 / mo) 2) Code testing / support for a changing array of computing environments 3) Oversight of WRF repository, contributions, and releases 4) Demand for tutorials 5) Occasional: Export compliance (ITAR) restrictions

  14. WRF Effort Plans at NCAR 2013 • Ongoing Support and Maintenance of System to Community 2 • Major Release, WRF Version 3.5: Spring 2013 • 14th WRF Users’ Workshop: June 24–28 (NCAR, Boulder) • Tutorials – Boulder, CO: July 2013 – York, UK: Fall 2013

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