ENA/MAG/PVC/TMP/CCN/C1 - Reprocess: CCN temperature unstable flag reversed

The variable CCN-temp unstable is incorrectly defined as a hexadecimal value. The values 
are 0 or 1 only. The description is also reversed. A value of 1 indicates the instrument 
is operating stably.

• CCN_temp_unstable_flag

ENA/CCN/C1 - Low concentrations in marine environment

The instrument mentor has been looking at marine CCN results for many years now, and is 
not really convinced there is a problem. CCN counts get very low in marine environments, 
down to 5 to 10 counts. Many times this is sudden with a change in the wind.

• AOS bin number of lowest channel of OPC include in summation of N_CCN(N_CCN_bin_number)
• Mean number concentration of N_CCN(N_CCN)
• AOS CCN droplet count by bin size(N_CCN_dN)

ENA/CCN/C1 - Problem with time fields

During the ENA deployment the CCN instrument clock was not synched with a time server 
until 12/2/2014.  Starting at about 11/03/2013 the CCN was 60 seconds slow.  From that time 
until the time was manually corrected on 10/07/2014 at 16:00:00 the CCN time gradually got 
faster relative to the CPC until it was approximately 10 minutes fast. On 12/2/2014 at 
20:28:30 the CCN was configured to automatically correct its time from the Unit 1 CPU.  
Since that time the CCN has been within 2 seconds of the time server except at startup.  
More recently the setting was changed to keep the CCN within about .6 sec.  Generally the 
time is being corrected by time client about once every 3 days.  

There have been 2 startups since the time synching was configured.  At these times the 
time was off by more, but was immediately corrected.  On 12/30/2014 at 19:28:01 the time was 
fast 66.235 sec. at startup.  On 01/16/2015 the time was fast 38.512 sec. at startup.

The  Document  shows the times of the peaks used to approximate the 
error in the time. The time was checked about once a week and its assumed that the time 
drifted gradually between the times in the file.

• AOS bin number of lowest channel of OPC include in summation of N_CCN(N_CCN_bin_number)
• CCN_proportional_valve_voltage
• CCN_P_sample
• CCN_Q_sheath
• CCN_temperature_gradient
• Altitude above mean sea level(alt)
• base_time
• CCN_super_saturation_calculated
• CCN_laser_current
• CCN_T_nafion
• Mean number concentration of N_CCN(N_CCN)
• CCN_Q_sample
• CCN_T_sample
• CCN_t_read_TEC2
• CCN_t_read_TEC1
• AOS CCN droplet count by bin size(N_CCN_dN)
• CCN_t_read_TEC3
• CCN_T_OPC
• time_offset
• CCN_ss_set
• East longitude(lon)
• North latitude(lat)
• CCN_temperature_std
• CCN_first_stage_monitor_voltage
• CCN_T_inlet
• CCN_temp_unstable_flag
• time

ENA/AOS/C1 - AOS Instrument Repair, Calibration and Modification: Mentor Site Visit

There was visit of 7 AOS instrument mentors to the ENA AOS during this period of 
instrument repair, calibration and modification. Instruments were occasionally off, or with no 
sample flow, or receiving calibration samples, etc. There was no productive sampling of 
ambient air during this period other than for testing. No data should be used for this period 
as ambient samples.

Note: Two datastream are missing. The CAPS Extinction Monitor and the Greenhouse gas 
instrument.

• AOS bin number of lowest channel of OPC include in summation of N_CCN(N_CCN_bin_number)
• CCN_proportional_valve_voltage
• CCN_T_nafion
• Mean number concentration of N_CCN(N_CCN)
• CCN_P_sample
• CCN_Q_sheath
• CCN_Q_sample
• CCN_T_sample
• CCN_t_read_TEC2
• CCN_temperature_gradient
• CCN_t_read_TEC1
• AOS CCN droplet count by bin size(N_CCN_dN)
• CCN_t_read_TEC3
• CCN_T_OPC
• CCN_ss_set
• CCN_temperature_std
• CCN_first_stage_monitor_voltage
• CCN_laser_current
• CCN_super_saturation_calculated
• CCN_temp_unstable_flag
• CCN_T_inlet

ENA/CCN/C1 - Failure of CCN

Data missing for the entire period. CCN was turned off due to the failure of the CCN OPC.

• AOS bin number of lowest channel of OPC include in summation of N_CCN(N_CCN_bin_number)
• CCN_proportional_valve_voltage
• CCN_T_nafion
• Mean number concentration of N_CCN(N_CCN)
• CCN_P_sample
• CCN_Q_sheath
• CCN_Q_sample
• CCN_T_sample
• CCN_t_read_TEC2
• CCN_temperature_gradient
• CCN_t_read_TEC1
• AOS CCN droplet count by bin size(N_CCN_dN)
• CCN_t_read_TEC3
• CCN_T_OPC
• CCN_ss_set
• CCN_temperature_std
• CCN_first_stage_monitor_voltage
• CCN_laser_current
• CCN_super_saturation_calculated
• CCN_temp_unstable_flag
• CCN_T_inlet

ENA/CCN/C1 - CCN offline for maintenance at the manufacturer

Instrument offline. Data missing.

• AOS bin number of lowest channel of OPC include in summation of N_CCN(N_CCN_bin_number)
• CCN_proportional_valve_voltage
• CCN_P_sample
• CCN_Q_sheath
• size_bin_bounds
• CCN_temperature_gradient
• Altitude above mean sea level(alt)
• CCN_OPC_set
• CCN_baseline_monitor
• base_time
• CCN_T_read_TEC1
• CCN_T_read_TEC2
• CCN_T_read_TEC3
• CCN_supersaturation_set_point
• size_bin
• CCN_super_saturation_calculated
• CCN_laser_current
• CCN_T_inlet_set
• CCN_T_set_TEC3
• CCN_T_set_TEC2
• CCN_T_set_TEC1
• CCN_T_nafion_set
• CCN_T_nafion
• Mean number concentration of N_CCN(N_CCN)
• CCN_Q_sample
• CCN_T_sample
• CCN_t_read_TEC2
• CCN_t_read_TEC1
• AOS CCN droplet count by bin size(N_CCN_dN)
• CCN_t_read_TEC3
• time_offset
• CCN_T_OPC
• CCN_overflow
• CCN_ss_set
• East longitude(lon)
• North latitude(lat)
• CCN_temp_unstable
• CCN_temperature_std
• CCN_first_stage_monitor_voltage
• CCN_T_inlet
• CCN_temp_unstable_flag
• CCN_alarm_code
• time

ENA/ACSM/C1 - Instrument waiting for spare parts

The ACSM was out of service while waiting for a replacement valve and a replacement turbo 
molecular vacuum pump. The data acquisition was stopped and the instrument put in standby 
mode.

• Mass concentration of nitrate, ambient aerosol in air.(nitrate)
• Mass concentration of chloride, ambient aerosol in air(chloride)
• org_mx_err
• Mass concentration of total organics, ambient aerosol in air.(total_organics)
• org_mx
• amus
• Mass concentration of sulfate, ambient aerosol in air.(sulfate)
• Mass concentration of ammonium, ambient aerosol in air(ammonium)

ENA/ACSM/C1 - Missing Data

Data is missing due to a failed filter switching valve.  The replacement valve was 
delivered in June 2014.  There were tuning issues with the instrument and the instrument was 
successfully tuned on July 10, 2014, and started generating good data.

• Mass concentration of nitrate, ambient aerosol in air.(nitrate)
• Mass concentration of chloride, ambient aerosol in air(chloride)
• qc_sulfate
• amus
• qc_chloride
• time_bounds
• qc_org_mx_err
• Mass concentration of sulfate, ambient aerosol in air.(sulfate)
• Altitude above mean sea level(alt)
• qc_org_mx
• qc_total_organics
• org_mx_err
• org_mx
• Mass concentration of total organics, ambient aerosol in air.(total_organics)
• North latitude(lat)
• base_time
• qc_ammonium
• East longitude(lon)
• time_offset
• time
• Mass concentration of ammonium, ambient aerosol in air(ammonium)
• qc_nitrate

ENA/C1 - Reprocess: Slightly incorrect location fields

Some of the instruments are being processed with the previous "GRW-Azores" lat/lon/alt 
instead of the new "ENA-Azores" lat/lon/alt. The differences are minor, but will be 
corrected. The respective GRW and ENA lat, lon, and alt values are as follows:
 
GRW  lat = 39.0911 ;
ENA lat = 39.0916 ;
GRW  lon = -28.0297 ;
ENA  lon = -28.0257 ;
GRW  alt = 26 ;
ENA  alt = 30.48 ;

• North latitude(lat)
• Altitude above mean sea level(alt)
• East longitude(lon)