SGP/MWR/B4  - Noisy 31 GHz channel

Instrument mentor analysis of the TIP data from 2/10/1996-2/14/1996 and found that the 
calibration of the microwave radiometer and did NOT need to be changed.

The results are as follows:

Date     Tnd_23     Tnd_31
Feb 96   163.56     168.47
Sep 95   163.55     168.99

However, the deviations about the mean were considerably larger in the 31 GHz channel than 
the 23 GHz: 0.82 vs 0.14 K, respectively. Consequently the 31 GHz brightness temperature 
also showed considerably greater variation than the 23 GHz brightness temperature.

The precipitable vapor shows good agreement with the colocated soundings, but instrument 
mentor recommends caution in using these data.

The instrument was shipped to the manufacture and 31.4 GHz gunn fiode oscillator was 
replaced by Radiometrics.

Use data with caution

• (Raw data stream - documentation not supported)

• Actual elevation angle(actel)
• Actual Azimuth(actaz)
• 31.4 GHz sky brightness temperature(31tbsky)
• 23.8 GHz sky brightness temperature(23tbsky)
• IR Brightness Temperature(ir_temp)
• Total water vapor along LOS path(vap)
• Averaged total liquid water along LOS path(liq)

• (Raw data stream - documentation not supported)

• Total water vapor along LOS path(vap)
• IR Brightness Temperature(ir_temp)
• Mean 23.8 GHz sky brightness temperature(tbsky23)
• Averaged total liquid water along LOS path(liq)
• Mean 31.4 GHz sky brightness temperature(tbsky31)

• Mean 23.8 GHz sky brightness temperature(tbsky23)
• 23.8 GHz noise injection brightness temperature(23unoise)
• Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
• Noise injection temp at nominal temperature at 23.8 GHz(noise_injection_temp_23)
• Temperature correction coefficient at 23.8 GHz(temperature_correction_coef_23)
• Ambient temperature(tkair)
• 23.8 GHz sky signal(sky23)
• Averaged total liquid water along LOS path(liq)
• 23.8 GHz blackbody+noise injection signal(bbn23)
• 31.4 GHz blackbody(bb31)
• 31.4 GHz noise injection brightness temperature(31unoise)
• 31.4 GHz sky brightness temperature(31tbsky)
• Which LOS configuration(losn)
• Mixer kinetic (physical) temperature(tkxc)
• Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
• Mean 31.4 GHz sky brightness temperature(tbsky31)
• Blackbody kinetic temperature(tkbb)
• 23.8 GHz sky brightness temperature(23tbsky)
• Actual elevation angle(actel)
• Noise injection temp at nominal temperature at 31.4 GHz(noise_injection_temp_31)
• 31.4 GHz sky signal(sky31)
• 31.4 GHz sky+noise injection signal(31skyn)
• (tknd)
• 23.8 GHz sky+noise injection signal(23skyn)
• 23.8 GHz Blackbody signal(bb23)
• Temperature correction coefficient at 31.4 GHz(temperature_correction_coef_31)
• Actual Azimuth(actaz)
• 31.4 GHz blac2body+noise injection signal(bbn31)
• Total water vapor along LOS path(vap)