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 concentration(ozone)
• ozone_bench_temp
• Ozone pressure(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.

• Ozone concentration(ozone)

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 ;

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