The example template given below contains the metadata fields that are commonly included when reporting data related to this specific template. Some of these metadata elements may not be relevant for your data reporting, like AIRS station ID for stations outside North America or the various QA measure data when there is no QA measure for the data. Such metadata elements could be let out. If you want to include additional metadata elements that are not given in the example template, there is a complete list here.  In case of any doubt about such additional metadata, please consult the EBAS team!

Template for submission of ozone measurements

This template should be used for submitting monitoring data of surface ozone done by standard photometers based on UV absorption.

Points to note

  • Mixing ratio given as [nmol/mol] is the preferred unit. Alternatively [ppb] could be used, assuming this is identical to [nmol/mol]. Data in [proxy ug/m3] = fac × [nmol/mol] is also accepted provided that the fixed values for T and P (typically T=293.15K and P = 1013.25 hPa) used to calculate fac is given in the "Volume std. temperature" and "Volume std. pressure" metadata.
  • A default standard value for the absorption cross-section is stated in the "Absorption cross section" element. As data provider you should check that this agrees with the value you are using and change it if needed
  • Include information of monitor calibration(s) in the QA metadata
  • Include information on filter test, leak tests, ozone scrubber test etc in the "Maintenance description" element
  • Include information of any kind if drying in the Temperature/humidity control tab. This is important for the question of whether the values refer to mixing ratio in moist or dry air
  • When calculating average values, e.g. hourly, from measurements with higher time resolution, please disregard any invalid measurements. Any informative flags, e.g. local contamination, occuring at any time during the average period need to be copied to the average value.
  • Reference temperature and pressure are only necessary to include when reporting mass concentration.
Downloading template as nasaames file

Please download the .nas file and edit, and remember to keep the .nas file-extension when you create your datafile:

Validation and submission:

To validate the file, please use the EBAS Submission Tool

Flags commonly used with this format:

The three main types of flags in EBAS are:

  • V (valid measurement): indicate a special condition at the station, but instrument has operated correctly, the data are therefore considered valid.
  • I (invalid measurement): showing that data are not available (not measured, deleted or if it is no precipitation)
  • M (missing measurement): mainly used for level 0 data to be able to exclude these data when being reprocessed to level 1 and level 2

For data harmonization across the network, the following short list of the flags should be used with this template. It is possible to use several flags at the same time to give detailed information about the data.

Group 0: Valid data
Flag Validity Description
000 V valid data, no flag
Group 1: Exception flags for accepted, irregular data
Flag Validity Description
110 V Episode data checked and accepted by data originator. Valid measurement
147 V Below theoretical detection limit or formal Q/A limit, but a value has been measured and reported and is considered valid
Group 3: Flags for aggregated datasets
Flag Validity Description
390 V Data completeness less than 50%
392 V Data completeness less than 75%
394 V Data completeness less than 90%
Group 5: Chemical problem
Flag Validity Description
559 V Unspecified contamination or local influence, but considered valid
599 I Unspecified contamination or local influence
Group 9: Missing flags
Flag Validity Description
999 M Missing measurement, unspecified reason
82 1001
Solberg, Sverre; Someone, Else
NO01L, Norwegian Institute for Air Research, NILU, , Instituttveien 18, , 2007, Kjeller, Norway
Hjellbrekke, Anne
1 1
2018 01 01 2020 10 15
days from file reference point
1 1 1 1 1 1
9.999999 9999.9 9999.9 9999.9 999.9 9.999
end_time of measurement, days from the file reference point
ozone, nmol/mol, Statistics=arithmetic mean
ozone, nmol/mol, Statistics=maximum
ozone, nmol/mol, Statistics=minimum
ozone, nmol/mol, Statistics=stddev
numflag, no unit
Data definition: EBAS_1.1
Set type code: TU
Timezone: UTC
File name: NO0042G.20180101000000.20201015093000.uv_abs.ozone.air.1y.1h.NO01L_NO42_uv_abs_42.NO01L_uv_ab.lev2.nas
Startdate: 20180101000000
Revision date: 20201015093000
Version: 1
Version description: initial revision,manually inspected
Data level: 2
Period code: 1y
Resolution code: 1h
Sample duration: 1h
Orig. time res.: 1mn
Station code: NO0042G
Platform code: NO0042S
Station name: Zeppelin mountain (Ny-Ă…lesund)
Station GAW-ID: ZEP
Station GAW-Name: Zeppelin Mountain (Ny Ă…lesund)
Station other IDs: 1158(NILUDB)
Station land use: Gravel and stone
Station setting: Polar
Station GAW type: G
Station WMO region: 6
Station latitude: 78.90715
Station longitude: 11.88668
Station altitude: 474.0 m
Measurement altitude: 478.0 m
Measurement height: 2.0 m
Regime: IMG
Component: ozone
Unit: nmol/mol
Matrix: air
Laboratory code: NO01L
Instrument type: uv_abs
Instrument name: NO42_uv_abs_42
Instrument manufacturer: Teledyne
Instrument model: 400A
Instrument serial number: 12345
Method ref: NO01L_uv_ab
Standard method: SOP=GAW_209(2013)
Inlet type: Hat or hood
Inlet tube material: Teflon
Inlet tube outer diameter: 6.35 mm
Inlet tube length: 4.0 m
Maintenance description: Monthly leak test, inlet filter checked every 2 months, ozone scrubber checked and replaced if needed once/year
Flow rate: 0.5 l/min
Zero/span check type: automatic
Zero/span check interval: 1d
Humidity/temperature control: None
Volume std. temperature: 293.15 K
Volume std. pressure: 1013.25 hPa
Detection limit: 1.0 nmol/mol
Absorption cross section: 1.1476e-17 cm2
QA1 measure ID: WCC Empa Site Audit
QA1 date: 20120902
Originator: Solberg, Sverre,, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway
Originator: Someone, Else,, Some nice Institute, WOW, Super interesting division, Street 18, , X-9999, Paradise, Noway
Submitter: Hjellbrekke, Anne,, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway
Acknowledgement: Request acknowledgement details from data originator
starttime endtime o3 o3max o3min o3std flag
0.000000 0.041667 72.4 82.0 67.9 12.1 0.000
0.041667 0.083333 102.2 102.5 100.3 1.2 0.000
0.083333 0.125000 9999.9 9999.9 9999.9 999.9 0.999

This service has been funded or supported by the Norwegian Institute for Air Research (NILU), the EU research infrastructure ACTRIS (Aerosols, Clouds, and Trace gases Research InfraStructure), the European Monitoring and Evaluation Programme (EMEP).