DQRID : D111122.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
07/25/2008000012/28/20082300Suspect
more
Subject:
HFE/AOS/M1 - CPC and CCN data questionable
DataStreams:hfenoaaaosM1.b1, hfeaosccnM1.a1
Description:
The CPC slowly clogged and the signal declined until the instrument was cleaned at which 
point the signal would increase. The data is still a good relative measure of the daily 
changes in the CN concentration, but the absolute value may be too low.

The mentor was unable to monitor the flow rate and operation in the CCN during operation. 
The relative changes in CCN with %ss are likely fine, but the absolute values may be too 
low or too high. Dust was prevalent at the site and likely contributed to the CCN signal 
such that large dust particles appeared as droplets.
Suggestions: 
Consult with mentor as to intended use of data
Measurements:hfeaosccnM1.a1:
  • N_CCN
  • N_CCN_dN
  • CCN_Q_sheath
  • CCN_Q_sample
more
hfenoaaaosM1.b1:
  • N_CPC_1
  • N_CCN
more

Close this window