SGP/DL/DLPROF/C1 - Data collected at vendor facility

Data collected during this period were recorded at the vendor facility in England (not 
SGP) for test purposes only.

• nshots
• Median Doppler lidar cloud base vertical velocity(cbw)
• Altitude above mean sea level(alt)
• ecor_tke
• snr_75
• w_25
• Vertical velocity kurtosis using SNR threshold(w_kurtosis)
• cbw_up_fraction
• ecor_ustar
• ngate_samples
• base_time
• met_spr_min
• w_75
• Median vertical velocity(w)
• ceil_lon
• met_alt
• North latitude(lat)
• met_spr_mean
• ecor_lat
• ecor_wt
• ecor_wq
• Signal to noise ratio(snr)
• ceil_alt
• Median Doppler lidar cloud base height(dl_cbh)
• sample_frequency
• time_bounds
• snr_25
• East longitude(lon)
• cbw_75
• ecor_w_kurt
• averaging_time
• noise
• met_lon
• ecor_h2o
• ceil_cbh
• Vertical velocity skewness using SNR threshold(w_skewness)
• Pressure, associated geometric height, at altitude, NGM model output(height)
• cbw_25
• Noise corrected vertical velocity variance(w_variance)
• time_offset
• ecor_alt
• dl_cbh_zmax
• ecor_w_var
• ecor_lon
• ceil_cbh_25
• dl_cbh_25
• ecor_temp
• met_spr_max
• ecor_w_skew
• ceil_lat
• time
• Fraction of time that a cloud is detected during averaging period from DL(dl_cloud_frequency)
• met_lat
• snr_threshold
• dl_cbh_75
• ceil_cbh_75
• Wavelength of spectrum data(wavelength)
• ceil_cloud_frequency
• ceil_cbh_zmax

SGP/DL/DLPROF/C1 - Instrumental artifact in vertical velocity variance profiles

Long-term averages of vertical velocity variance profiles developed from vertical staring 
data show a height-dependent sinusoidal modulation superimposed on the atmospheric 
variance profile. This modulation causes a wiggle in the variance profile. The period of the 
wiggle is about 350 m, and the effect is most obvious during hot afternoon periods in the 
summer months. The exact cause of this problem is not known, but we suspect that it may be 
caused by temperature sensitivity in beam alignment.

• Noise corrected vertical velocity variance(w_variance)