comments on the groundwinds nh 2000 intercomparison campaign
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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? - PowerPoint PPT PresentationTRANSCRIPT
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?
• Answer: yes – signal permitting
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
Profiles of radiosonde wind speed & direction on 28/29 September 2000.
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.)
Time-height section of mini-MOPA SNR 09/28/00 - 09/29/00. The cloud layer visible as enhanced SNR at 4-6 km.
Time-Height section of GroundWinds (molecular) 1-min LOSH velocities.
Time-height section of uncertainty reported for 1-min radial velocity for GroundWinds (molecular channel.)
Time-height section of GLOW 1-min LOSH velocities.
Mean Difference= -1.51 m/s
SD of MD = 5.18 m/s
Size= 198
Mean Difference = -1.84 m/sSD of MD = 4.66 m/sSize= 132
Mean Difference =1.0 m/sSD of MD = 4.67 m/sSize= 78
Mean Difference= -2.51 m/sSD = 5.58 m/sSize= 78
Mean Difference =2.41 m/sSD of MD = 2.83 m/sSize= 140
Mean Difference =0.23 m/sSD of MD = 2.24 m/sSize=140
Mean Difference = -2.78 m/sSD of MD =2.04 m/sSize=166
Mean Difference =1.63 m/sSD of MD = 2.70 m/sSize= 169
Mean Diff. =-1.25 m/sSD of MD =3.04 m/sSize=193
Mean=-1.07 m/sSD=2.55 m/sSize=567
Mean=-1.17 m/sSD=2.67 m/sSize=762
Mean Difference =-0.7 m/s
SD of MD =5.57 m/s
Size=361
Mean Difference=-3.76 m/sSD of MD =8.19 m/sSize =114 (120)
The horizontal separation of radiosondes and Doppler Wind Lidar sampling volumes as functions of height.
Profiles of radiosonde relative humidity & temperature on 09/28/00 and 09/29/00. Note descending, thickening cloud layer
Mean=0.07 m/sSD=5.42 m/sSize=247