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Comments on the GroundWinds NH 2000 Intercomparison Campaign

Comments on the GroundWinds NH 2000 Intercomparison Campaign. James G. Yoe M.K. Rama Varma Raja. Core Questions. Are the DWL’s LOSH measurements consistent with the (accepted) wind? Did the optical instruments provide LOSH wind measurements in agreement with one another?

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Comments on the GroundWinds NH 2000 Intercomparison Campaign

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  1. Comments on the GroundWinds NH 2000 Intercomparison Campaign James G. Yoe M.K. Rama Varma Raja

  2. Core Questions • Are the DWL’s LOSH measurements consistent with the (accepted) wind? • Did the optical instruments provide LOSH wind measurements in agreement with one another? • Answer: yes – signal permitting

  3. Approach to addressing • Examination of “best” dataset • Use most extensive set of observations • Stationary atmospheric conditions prevailing • Departures recognizable • Data processing/products considered optimal • 09/28/00

  4. Profiles of radiosonde wind speed & direction on 28/29 September 2000.

  5. Initially clear conditions give way to a thick, descending cloud layer near 5 km between 0000 - 0300 UT on 09/29/00. (GLOW total photon counts display similar structure.)

  6. Time-height section of mini-MOPA SNR 09/28/00 - 09/29/00. The cloud layer visible as enhanced SNR at 4-6 km.

  7. Time-Height section of GroundWinds (molecular) 1-min LOSH velocities.

  8. Time-height section of uncertainty reported for 1-min radial velocity for GroundWinds (molecular channel.)

  9. Time-height section of GLOW 1-min LOSH velocities.

  10. Mean Difference= -1.51 m/s SD of MD = 5.18 m/s Size= 198 Mean Difference = -1.84 m/s SD of MD = 4.66 m/s Size= 132

  11. Mean Difference =1.0 m/s SD of MD = 4.67 m/s Size= 78 Mean Difference= -2.51 m/s SD = 5.58 m/s Size= 78

  12. Mean Difference =0.23 m/s SD of MD = 2.24 m/s Size=140 Mean Difference =2.41 m/s SD of MD = 2.83 m/s Size= 140

  13. Mean Difference = -2.78 m/s SD of MD =2.04 m/s Size=166 Mean Difference =1.63 m/s SD of MD = 2.70 m/s Size= 169 Mean Diff. =-1.25 m/s SD of MD =3.04 m/s Size=193

  14. Mean=-1.17 m/s SD=2.67 m/s Size=762 Mean=-1.07 m/s SD=2.55 m/s Size=567

  15. Mean Difference =-0.7 m/s SD of MD =5.57 m/s Size=361 Mean Difference=-3.76 m/s SD of MD =8.19 m/s Size =114 (120)

  16. The horizontal separation of radiosondes and Doppler Wind Lidar sampling volumes as functions of height.

  17. Profiles of radiosonde relative humidity & temperature on 09/28/00 and 09/29/00. Note descending, thickening cloud layer

  18. Mean=0.07 m/s SD=5.42 m/s Size=247

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