SGP/AOS/C1 - Nephelometer failure

An inexperienced AOS technician inadvertently closed off the flow to the dual-nephelometer 
humidograph system during a Friday Preventative Maintenance.  This resulted in liquid 
water getting into the humidified nephelometer.  Flow was restored to the system on Monday, 
but the nephelometers were producing strange data.  A number of tests were performed 
over the next few days to remotely troubleshoot the situation, to no avail.  Eventually, the 
decision was made to pull both nephelometers and return them to Boulder for repair.  
This DQR refers only to the reference nephelometer, which was out of service for 2 periods 
due to 2 separate problems.  This DQR is for the first period, from 000602 (1842 GMT) to 
000616 (2234 GMT).  Light absorption are invalid whenever the reference nephelometer is 
not operational, because those data are required for correction of the absorption data.

• TSI Low RH Neph. 550 nm rayleigh scattering coefficient for zero gas(GrnRScatZero_LRH)
• TSI Low RH Neph. 450 nm back scattering coefficient for zero gas(BluBScatZero_LRH)
• TSI Low RH Neph. 700 nm back scattering coefficient for zero gas(RedBScatZero_LRH)
• TSI Low RH Neph. 550 nm total scattering coefficient for zero gas(GrnTScatZero_LRH)
• TSI Low RH Neph. 700 nm total scattering coefficient for cal. gas(RedTScatSpn_LRH)
• TSI Low RH Neph. 700 nm back scattering coefficient for cal. gas(RedBScatSpn_LRH)
• TSI Low RH Neph. 700 nm total scattering coefficient for zero gas(RedTScatZero_LRH)
• TSI Low RH Neph. 450 nm total scattering coefficient for zero gas(BluTScatZero_LRH)
• CLAP reference signal(BapRef)
• TSI Low RH Neph. 550 nm back scattering coefficient for zero gas(GrnBScatZero_LRH)
• CLAP Signal(BapSignal)
• TSI Low RH Neph. 550 nm total scattering coefficient for cal. gas(GrnTScatSpn_LRH)
• TSI Low RH Neph. 450 nm rayleigh scattering coefficient for zero gas(BluRScatZero_LRH)
• TSI Low RH Neph. 450 nm back scattering coefficient for cal. gas(BluBScatSpn_LRH)
• TSI Low RH Neph. 700 nm rayleigh scattering coefficient for zero gas(RedRScatZero_LRH)
• TSI Low RH Neph. 550 nm back scattering coefficient for cal. gas(GrnBScatSpn_LRH)
• TSI Low RH Neph. 450 nm total scattering coefficient for cal. gas(BluTScatSpn_LRH)

• TSI Low RH Neph. 550 nm backscat. coef. at 1 um(GrnBScatCoef_1um_LRH)
• TSI Low RH Neph. 550 nm total scat. coef. at 10 um(GrnTScatCoef_10um_LRH)
• TSI Low RH Neph. 450 nm total scat. coef. at 1 um(BluTScatCoef_1um_LRH)
• TSI Low RH Neph. 700 nm backscat. coef. at 1 um(RedBScatCoef_1um_LRH)
• TSI Low RH Neph. 700 nm total scat. coef. at 10 um(RedTScatCoef_10um_LRH)
• 1 um Absorption coefficient(Bap_I_1um)
• TSI Low RH Neph. 550 nm backscat. coef. at 10 um(GrnBScatCoef_10um_LRH)
• TSI Low RH Neph. 550 nm total scat. coef. at 1 um(GrnTScatCoef_1um_LRH)
• TSI Low RH Neph. 450 nm backscat. coef. at 1 um(BluBScatCoef_1um_LRH)
• TSI Low RH Neph. 700 nm total scat. coef. at 1 um(RedTScatCoef_1um_LRH)
• TSI Low RH Neph. 450 nm total scat. coef. at 10 um(BluTScatCoef_10um_LRH)
• 10 um Absorption coefficient(Bap_I_10um)
• TSI Low RH Neph. 700 nm backscat. coef. at 10 um(RedBScatCoef_10um_LRH)
• TSI Low RH Neph. 450 nm backscat. coef. at 10 um(BluBScatCoef_10um_LRH)