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High-Resolution WRF Domain Verification & Assimilation with Radio-Soundings

Explore wind speed, wind direction, temperature, and humidity between 1050 and 850hPa utilizing radio-soundings & WRF models for Oct-Dec 2006. Implement changes in model coupling for improved accuracy.

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High-Resolution WRF Domain Verification & Assimilation with Radio-Soundings

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  1. Radio-soundings coverage WRF domain 1 (Δx = 30km) WRF domain 2 (Δx = 10km) WRF domain 3 (Δx = 3km) Coverage in radio-soundings observations at 850hPa

  2. WRF domain 3 (~3km) verification No assimilation Assimilation Wind speed between 1050 and 850hPa for the period Oct 1-Dec. 31, 2006 radio-sounding: x-axis, WRF y-axis 3 Wind speed between 1050 and 850hPa for the period Oct 1-Dec. 31, 2006 radio-sounding: x-axis, WRF y-axis 3

  3. WRF domain 3 (~3km) verification No assimilation Assimilation Wind direction between 1050 and 850hPa for the period Oct 1-Dec. 31, 2006: radio-sounding: x-axis, WRF y-axis 3 Wind direction between 1050 and 850hPa for the period Oct 1-Dec. 31, 2006: radio-sounding: x-axis, WRF y-axis 3

  4. WRF domain 3 (~3km) verification No assimilation Assimilation Temperature between 1050 and 850hPa for the period Oct 1-Dec. 31, 2006: radio-sounding: x-axis, WRF y-axis 3 Temperature between 1050 and 850hPa for the period Oct 1-Dec. 31, 2006: radio-sounding: x-axis, WRF y-axis 3

  5. WRF domain 3 (~3km) verification No assimilation Assimilation Humidity between 1050 and 850hPa for the period Oct 1-Dec. 31, 2006: radio-sounding: x-axis, WRF y-axis 3 Humidity between 1050 and 850hPa for the period Oct 1-Dec. 31, 2006: radio-sounding: x-axis, WRF y-axis 3

  6. WRF/WIII coupling • Switch from WW3 version3.14 to version4.18 to keep pace with the latest wave model; • Change the option from FLX0 to FLX2 so that the friction velocity from Tolman and Chalikov is used; • Modify the Gridgen packages so that the fluxes between the mother domain and nested domain can be exchanged, which is needed by the FLX2 options; • Modify the WW3 code so that the roughness length ZNT can be output for coupling with the atmospheric model; • Fix some bugs in WW3 V4.18 so that the output issue of default ZNT value in the nested domain is remedy; • Write a script to conduct runs with the coupled system WRF/WWW for the period Oct-Dec. 2006 with wind & roughness exchange every 20mn to 1hr.

  7. Wind at 10m and Z0 for GRID1 Using FLX0at 01Z July 1, 2006

  8. Wind at 10m and Z0 for GRID1 Using FLX2 at 01Z July 1, 2006

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