SGP/DL/C1 - Instrument failure

In July the SGP DL experienced a failure. The instrument was subsequently sent back to the 
vendor for repair and upgrade. That work was successfully completed in October. The 
instrument was then shipped back to SGP and reinstalled in November.

• North latitude(lat)
• azimuth
• time_offset
• Altitude above mean sea level(alt)
• Radial velocity(radial_velocity)
• range
• intensity
• Attenuated backscatter(attenuated_backscatter)
• East longitude(lon)
• base_time
• elevation
• time

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.

• time_offset
• Altitude above mean sea level(alt)
• Attenuated backscatter(attenuated_backscatter)
• qc_time
• base_time
• North latitude(lat)
• qc_radial_velocity
• azimuth
• range
• Radial velocity(radial_velocity)
• intensity
• East longitude(lon)
• time
• elevation

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.

• Radial velocity(radial_velocity)