SGP/CSPHOT/C1 - AOT 1640 channel data missing

AOT 1640 channel data missing.  The instrument deployed at SGP from September 2008 to July 
2010 was not upgraded with this additional channel.

• TripletVar_1640
• Aerosol optical thickness, at 1640 nm, from CSPHOT(aot_1640)

• TripletVar_1640
• Aerosol optical thickness, at 1640 nm, from CSPHOT(aot_1640)

GRW/CSPHOT/M1 - Obstruction in collimator tube

Data are suspect. There is a discrepancy between the 1640 channel and the other channels. 
The discrepancy is possibly related to the intermittent obstruction (a lizard) found in 
the collimator tube. There may also be ongoing degradation of the instrument possibly 
related to the lizard activity and deposits.

• TripletVar_670
• Aerosol optical thickness, at 380 nm, from CSPHOT(aot_380)
• Aerosol optical thickness, at 440 nm, from CSPHOT(aot_440)
• TripletVar_870
• Aerosol optical thickness, angstrom coefficient, at 440-675 nm, polarized(Angstrom440_675_Polar)
• TripletVar_500
• Aerosol optical thickness, angstrom coefficient, at 440-675 nm, from CSPHOT(Angstrom440_675)
• TripletVar_1020
• Aerosol optical thickness, angstrom coefficient, at 500-870 nm, from CSPHOT(Angstrom500_870)
• Aerosol optical thickness, at 670 nm, from CSPHOT(aot_670)
• Aerosol optical thickness, angstrom coefficient, at 380-500 nm, from CSPHOT(Angstrom380_500)
• Aerosol optical thickness, at 1020 nm, from CSPHOT(aot_1020)
• TripletVar_340
• Aerosol optical thickness, at 870 nm, from CSPHOT(aot_870)
• Column precip water vapor(pwv)
• TripletVar_1640
• TripletVar_380
• Aerosol optical thickness, angstrom coefficient, at 440-870 nm, from CSPHOT(Angstrom440_870)
• TripletVar_440
• Aerosol optical thickness, angstrom coefficient, at 340-440 nm, from CSPHOT(Angstrom340_440)
• Aerosol optical thickness, at 500 nm, from CPSHOT(aot_500)
• Aerosol optical thickness, at 1640 nm, from CSPHOT(aot_1640)
• WaterError
• Aerosol optical thickness, at 340 nm, from CSPHOT(aot_340)

GRW/CSPHOT/M1 - Instrument scanning problem

There were problems with the almucantar scans causing difficulty in tracking the sun 
between the almucantar scans for each wavelength. 

The instrument was due for calibration and maintenance. This unit was replaced on 
5/6/2010.

• TripletVar_670
• Aerosol optical thickness, at 380 nm, from CSPHOT(aot_380)
• Aerosol optical thickness, at 440 nm, from CSPHOT(aot_440)
• TripletVar_870
• Aerosol optical thickness, angstrom coefficient, at 440-675 nm, polarized(Angstrom440_675_Polar)
• zenith
• TripletVar_500
• Aerosol optical thickness, angstrom coefficient, at 440-675 nm, from CSPHOT(Angstrom440_675)
• TripletVar_1020
• Aerosol optical thickness, angstrom coefficient, at 500-870 nm, from CSPHOT(Angstrom500_870)
• Aerosol optical thickness, at 670 nm, from CSPHOT(aot_670)
• Aerosol optical thickness, angstrom coefficient, at 380-500 nm, from CSPHOT(Angstrom380_500)
• Aerosol optical thickness, at 1020 nm, from CSPHOT(aot_1020)
• Aerosol optical thickness, at 870 nm, from CSPHOT(aot_870)
• TripletVar_340
• Column precip water vapor(pwv)
• TripletVar_1640
• TripletVar_380
• Aerosol optical thickness, angstrom coefficient, at 440-870 nm, from CSPHOT(Angstrom440_870)
• TripletVar_440
• Aerosol optical thickness, angstrom coefficient, at 340-440 nm, from CSPHOT(Angstrom340_440)
• Aerosol optical thickness, at 500 nm, from CPSHOT(aot_500)
• Aerosol optical thickness, at 1640 nm, from CSPHOT(aot_1640)
• WaterError
• Aerosol optical thickness, at 340 nm, from CSPHOT(aot_340)