SGP/SIRS/E11 - Intake Fan Failure

Data were missing from this station from 5/27 to 6/1.  After collections resumed on 6/1, 
the first night (6/2) data revealed down_short_hemisp (PSP) and down_short_diffuse_hemisp 
(8-48) data consistent with ventilator fan failure or obstructed fan filter resulting in 
large thermal offsets.  

On 6/14 Ops cleaned obstructed ventilator fans on both 8-48 and PSP instruments which 
corrected the large thermal offsets.  The PSP was seriously affected and possibly the 8-48 to 
a lesser degree.  

Due to correction on a partly cloudy day the degree of thermal offset cannot be well 
quantified.  Users are advised to avoid the PSP data (down_short_hemisp) completely during 
this time period.  The 8-48 data (down_short_diffuse_hemisp) are suspect.

Data are not recoverable.  Avoid using the data from the specified instruments during 

the time range noted

• inst_diffuse
• inst_global

• down_short_hemisp
• down_short_hemisp_std
• down_short_diffuse_hemisp_max
• down_short_hemisp_min
• down_short_diffuse_hemisp_std
• down_short_diffuse_hemisp
• down_short_diffuse_hemisp_min
• down_short_hemisp_max