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.

• ozone_bench_temp
• Daily values of ozone on each grid cell(ozone)
• ozone_pressure

ENA/OZONE/C1 - Reprocess: Under reporting ozone concentration

Switching valve developed an internal leak that gradually worsened. Reported instrument 
values are under-representations of the ambient ozone concentration during this period. The 
under reporting worsens from 85% to 77% over the course of this DQR. No corrections have 
been applied at this point.

• Daily values of ozone on each grid cell(ozone)

ENA/C1 - Reprocessed and Corrected: Slightly incorrect location fields

DATA REPROCESSED and CORRECTED: 

Some of the instruments were being processed with the previous "GRW-Azores" lat/lon/alt 
instead of the new "ENA-Azores" lat/lon/alt. The differences were minor, but have been 
corrected.

GRW (old) lat = 39.0911
ENA lat = 39.0916
GRW (old) lon = -28.0297
ENA lon = -28.0257
GRW (old) alt = 26
ENA alt = 30.48

The data were archived in October 2016. Please retrieve the reprocessed data for use in 
your analysis.

ORIGINAL DQR CATEGORY: Yellow (suspect)

REPROCESSED and CORRECTED DATA ARCHIVED:2016-10

REPROCESS IDENTIFICATION NUMBER: RID 1460

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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/OZONE/C1 - Reprocessed and Corrected: enaosozoneC1.a1 to enaaoso3C1.a1

DATA REPROCESSED and CORRECTED: 

The enaaosozone.a1 data was renamed to enaaoso3.a1. In addition to
the rename, we added data from raw data columns that were originally not included. These 
additional columns will be used in subsequent downstream processing.

The data were archived February 2017. Please retrieve the reprocessed data for use in your 
analysis.


ORIGINAL DQR CATEGORY:	Transparent (Does not affect quality)

REPROCESSED and CORRECTED DATA ARCHIVED:2017-02

REPROCESS IDENTIFICATION NUMBER: RID 1493

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--- ORIGINAL DQR DESCRIPTION ---
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The enaaosozoneC1.a1 data is being renamed to aoso3.a1. In addition to the 
rename, we are adding data from raw data columns that were missed. These 
additional columns will be used in subsequent downstream processing.

• ozone_bench_temp
• East longitude(lon)
• time_offset
• time
• Daily values of ozone on each grid cell(ozone)
• ozone_pressure
• base_time
• North latitude(lat)
• Altitude above mean sea level(alt)