ENA/CPC/NEPH/PSAP/C1 - Impactor not installed

No impactor installed.  All data is the same as when impactor at 10 um setting.

• scattering_voltage
• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)
• sheath_flow
• MET air temperature(temperature)
• sampling_volume
• purge_flow
• unit_temperature
• auxiliary
• reference
• current
• sample_pressure
• flow
• lower_size_limit
• upper_size_limit
• differential_voltage

ENA/UHSAS/C1 - Reprocess: Upper and lower size limit incorrect

The lower size limit and upper size limit (99 bins) is incorrect because the values are 
not read from the header records.

• upper_size_limit
• lower_size_limit

ENA/UHSAS/C1 - Computer Failure

The CPC unit for the UHSAS (and other systems) failed.  The UHSAS was down at this time 
and came back up after the CPC unit was fixed.

• scattering_voltage
• time
• base_time
• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)
• sheath_flow
• Altitude above mean sea level(alt)
• MET air temperature(temperature)
• North latitude(lat)
• sampling_volume
• time_offset
• purge_flow
• unit_temperature
• auxiliary
• current
• reference
• sample_pressure
• lower_size_limit
• flow
• upper_size_limit
• differential_voltage
• East longitude(lon)
• bin_num

ENA/DL/C1 - Instrument down due to power supply failure

No data was collected during the period in question because the instrument was down due to 
a power supply failure.

• North latitude(lat)
• intensity
• base_time
• Altitude above mean sea level(alt)
• azimuth
• time
• Attenuated backscatter(attenuated_backscatter)
• Radial velocity(radial_velocity)
• range
• East longitude(lon)
• elevation
• time_offset

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.

• scattering_voltage
• MET air temperature(temperature)
• sampling_volume
• auxiliary
• reference
• upper_size_limit
• flow
• differential_voltage
• bin_num
• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)
• sheath_flow
• purge_flow
• unit_temperature
• current
• sample_pressure
• lower_size_limit

• scan_min_diameter_setting
• scan_time_setting
• dry_rh_setting
• Concentration of aerosol(aerosol_concentration)
• dry_diameter_setting
• bin_center
• scan_type
• bin
• scan_max_diameter_setting
• bin_width
• atomizer
• Total concentration(total_concentration)
• num_bins
• humid_rh
• sample_flow

ENA/DL/C1 - System down due to power supply issue

The system was down during the period in question due to an issue with the power supply.

• North latitude(lat)
• intensity
• base_time
• Altitude above mean sea level(alt)
• azimuth
• time
• Attenuated backscatter(attenuated_backscatter)
• Radial velocity(radial_velocity)
• range
• East longitude(lon)
• elevation
• time_offset

ENA/HTDMA/C1 - Incorrect air flow

Low sample flow, no ambient aerosol size selection and HSEMS was measuring cabin air. 
Additionally, HSEMS air flows, temperatures and RH were incorrect.

• scan_min_diameter_setting
• scan_time_setting
• scan_max_diameter_setting
• dry_rh_setting
• Concentration of aerosol(aerosol_concentration)
• dry_diameter_setting
• bin_width
• bin_center
• Total concentration(total_concentration)
• atomizer
• scan_type
• humid_rh
• num_bins
• sample_flow
• bin

ENA/UHSAS/C1 - Reprocess: Non-optimal bin sizes

The UHSAS was programmed with a bin sizes appropriate to the aerial UHSAS. This is not 
really a problem. The bin sizes are not consistent with the other console UHSAS. The problem 
is in blindly comparing the data between the various UHSAS. This is not a problem of 
mislabeling or incorrect size bins. The data are correct for the stated size bins.

• upper_size_limit
• lower_size_limit

ENA/HTDMA/C1 - Incorrect RH and air flow

The HT-DMA internal RH sensor was sending out data in a format that was not correctly 
interpreted by the instrument software. This led the software to assume an incorrect RH 
reading and set the humid and dry air flows at incorrect values, affecting RH and other 
internal flows.

• scan_min_diameter_setting
• scan_time_setting
• scan_max_diameter_setting
• dry_rh_setting
• Concentration of aerosol(aerosol_concentration)
• dry_diameter_setting
• bin_width
• bin_center
• Total concentration(total_concentration)
• atomizer
• scan_type
• humid_rh
• num_bins
• sample_flow
• bin

ENA/UHSAS/C1 - High counts on three lowest channels

High counts in the UHSAS three lowest channels. Probably a contamination (a fiber on the 
jet nozzle) inside the optical chamber. Rest of the channels should not be affected.

• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)

ENA/UHSAS/C1 - spikes in lower size bins

Intermittent spikes in the lowest 3 size bins. Probably a contamination that was cleared 
when a HEPA filter was installed for zero testing. Other bins should not be affected.

• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)

ENA/UHSAS/C1 - HEPA filter attached to inlet

HEPA filter was attached to the UHSAS inlet for troubleshooting the issues related to DQR 
D151228.1. No ambient measurements were made during this period.

• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)

ENA/DL/C1 - Instrument removed for hurricane

The instrument was taken offline and stored indoors to avoid potential damage during a 
hurricane passage.

• North latitude(lat)
• intensity
• base_time
• Altitude above mean sea level(alt)
• azimuth
• time
• Attenuated backscatter(attenuated_backscatter)
• Radial velocity(radial_velocity)
• range
• East longitude(lon)
• elevation
• time_offset

ENA/UHSAS/C1 - Noisy counts / no counts

UHSAS was showing spikes in the lowest channels. An HEPA filter was attached to the inlet 
for troubleshooting. No valid data during the period with spikes and when the filter was 
attached.

• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)

ENA/UHSAS/C1 - High counts in lower bins

High counts in the 3 lowest bins/channels. Possible contamination. Other bins should not 
be affected.

• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)

ENA/UHSAS/C1 - High counts in lower bins

High counts in the 4 lowest bins/channels. Possible contamination. Instrument set up to 
sample through a filter for troubleshooting. No valid data from the period.

• scattering_voltage
• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)
• sheath_flow
• MET air temperature(temperature)
• sampling_volume
• purge_flow
• unit_temperature
• auxiliary
• reference
• current
• sample_pressure
• flow
• upper_size_limit
• lower_size_limit
• differential_voltage
• bin_num

ENA/UHSAS/C1 - Intermittent spikes in the lowest channels

Intermittent spikes in the 3 lowest size bins. Rest of the bins should be unaffected.

• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)

ENA/UHSAS/C1 - High counts in the 3 lowest size bins

High counts in the lowest 3 size bins. The rest of the bins should be unaffected.

• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)

ENA/UHSAS/C1 - High counts in the 3 lowest size bins

High counts in the 3 lowest size bins. Other size bins should not be affected.

• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)

ENA/UHSAS/C1 - High counts in 3 lowest size bins

High counts in the 3 lowest size bins. Other size bins should not be affected.

• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)

ENA/UHSAS/C1 - Intermittent spikes in the lower size bins

Intermittent spikes in the 3 lowest size bins. Other size bins should not be affected.

• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)

ENA/UHSAS/C1 - Instrument not sampling ambient air

Instrument was periodically offline or not sampling ambient air for troubleshooting 
purposes. Data missing or no valid data.

• scattering_voltage
• base_time
• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)
• sheath_flow
• MET air temperature(temperature)
• sampling_volume
• purge_flow
• unit_temperature
• auxiliary
• reference
• current
• sample_pressure
• flow
• upper_size_limit
• lower_size_limit
• differential_voltage
• bin_num

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 ;

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

ENA/DL/DLPROF/C1 - Reprocess: Incorrect serial number

The instrument serial number that appears in the netcdf files global attributes is 
incorrect. The correct serial number is 0514-84.

• base_time

ENA/UHSAS/C1 - High counts in lower size bins

High counts in the 3 lowest size bins. Other size bins should not be affected.

• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)

ENA/UHSAS/C1 - missing data

Instrument's internal hard drive was full and no new data was being saved except a few 
samples occasionally.

• scattering_voltage
• time
• base_time
• Particle size distribution, limited by lower_size_limit and upper_size_limit(size_distribution)
• sheath_flow
• Altitude above mean sea level(alt)
• MET air temperature(temperature)
• North latitude(lat)
• sampling_volume
• time_offset
• purge_flow
• unit_temperature
• auxiliary
• current
• reference
• sample_pressure
• lower_size_limit
• flow
• upper_size_limit
• differential_voltage
• East longitude(lon)
• bin_num