GRW/AOS/M1 - CCN Detector misalignment

The CCN signal was unusually low about 100 particles/cc. The %SS growth curves were 
asymmetrical. Upon consultation with the manufacturer, DMT, it was predicted that the OPC 
detector was clogged or misaligned. I had the tech, Carlos, remove the detector and ship it 
back to Boulder. The detector was cleaned. An o-ring for a lens wasn't properly seated. The 
OPC was sent back to GRW and installed. Data looks normal after the reinstallation on 
July 13th.

Don't use the data during this time.

• Cloud condensation nuclei number density(N_CCN)
• Bin number of lowest channel of OPC include in summation of N_CCN(N_CCN_bin_number)
• AOS CCN number concentration by bin(N_CCN_dN)