Description: | The water circulation system for the AOS humidograph failed. Consequently, the humidified
nephelometer was reporting aerosol light scattering values during this period that were
close to what the reference nephelometer was observing. The difference between the two
sets of measurements reflect particle losses in the humidifier and different temperature
environments for the two instruments. Humidified nephelometer data during this period are
technically valid, they just do not reflect relative humidity scans (the normal operating
mode). |