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Environmental Reanalyses and Models: A Comparative Study

This study compares the environmental reanalyses and models of the European Centre for Medium-Range Weather Forecasts (ECMWF), NCEP/NCAR, and Rutgers University to understand their processes, variables, and products. It also explores the impact of high winds, tropical cyclones, nor’easters, thunderstorms, flooding, winter storms, and other weather events. Additionally, it examines the variables related to temperature, wind, precipitation, and lightning. The study includes extra slides on ERA-Interim variables and ECMWF products.

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Environmental Reanalyses and Models: A Comparative Study

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  1. Environmental Reanalyses and ModelsTravis Miles, Greg Seroka, Louis Bowers, Rich Dunk, Scott Glenn

  2. Outline • Products • Comparisons • Processes • Proposed variables

  3. European Centre for Medium-Range Weather Forecasts (ECMWF) Reanalysis (ERA)-Interim • Resolution: 80-km, every 3 hrs for surface, 6 hrs for full model levels • Time period: 1979-present (125 km equivalent 1900-2010) • Domain: Global

  4. NCEP North American Regional Reanalysis (NARR) • Resolution: 32-km, every 3 hrs • Time period: 1979-present • Domain:

  5. 80 km 180 km 32 km NCEP/NCAR Global Reanalysis ERA-Interim NARR

  6. Rutgers Univ. Weather Research & Forecasting (RU-WRF) Model • Resolution: 9-3-1-km; every 1 hr • Time period: June 2011-present • Domain: 9km

  7. Rutgers Univ. Weather Research & Forecasting (RU-WRF) Model • Resolution: 9-3-1-km; every 1 hr • Time period: June 2011-present • Domain: 3km

  8. Rutgers Univ. Weather Research & Forecasting (RU-WRF) Model • Resolution: 9-3-1-km; every 1 hr • Time period: June 2011-present • Domain: 1km

  9. NARR 32 km WRF 6km

  10. Processes • High winds • Tropical cyclones • Nor’easters • Derechos • Thunderstorms • Flooding/Precipitation • Winter • Snowstorms • Ice • Cold snaps • Summer • Heat waves • Lightning • Etc. Tropical cyclones Severe t’storms

  11. Variables • PSEG Forecasting (2002-2007) • Cold temp • <15F for 3+ hours, or <10F • High Temp • >90F for 3+ hours or >95F • Sustained Winds • >25 MPH for 3+ hours or >30 MPH • Gusts • >35 MPH • Rainfall • >1” • Snowfall • >3” Wet or >5” Dry • Freezing Rain • Any • Sleet • >0.1” • Frequent Lightning Additional • RH • Solar radiation • Cloud cover • Soil moisture • Radar reflectivity (only RU-WRF)

  12. Extra Slides

  13. ERA-Interim Variables 10 metre u and v wind components 2 metredewpoint temperature 2 metre temperature Albedo high cloud cover high vegetation cover, ice surface temperature levels 1, 2, 3 and 4 log of surface roughness for heat low cloud cover low vegetation cover mean sea level pressure medium cloud cover sea-ice cover sea surface temperature skin reservoir content skin temperature slope of subgrid scale orography snow albedo snow density snow depth soil temperature levels 1, 2, 3 and 4 standard deviation of orography surface pressure surface roughness temperature of snow layer total cloud cover total column ozone total column water total column water vapour type of high vegetation type of low vegetation volumetric soil wetness levels 1, 2, 3 and 4

  14. ECMWF Products ERA-Interim • 6 hourly atmospheric fields on model levels, 3 hourly surface fields (4D-VAR data assimilation) • Global atmospheric reanalysis product (i.e. no lateral boundary conditions) • Resolution: 80-km, 60 layers • Time Period:1979-present updated in real-time ERA-20C(ML),40 • Lower resolution (~125 km), longer time periods(1900 – 2010 for ERA-20 and 1957-2003 for ERA-40), different assimilation techniques.

  15. NAM 12km RU-WRF 3km

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