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!

Aerosol Particle Mass Concentration Data Obtained with Certified Equivalent Online Method (level 2)

Below, you find an example of a data file reporting measurements of aerosol particulate mass concentration measured by online methods certified as equivalent to the gravimetric reference method. This comprises currently the proxy methods of "Tapered Element Oscillating Microbalanace" (TEOM), attenuation of beta radiation, and optical measurement of the particle size distribution. The format has been designed to make data reporting as easy as possible while still keeping the file self-explanatory and containing the essential information necessary for archiving and interpreting the file content. The parameters to be included in a regular data submission have been determined by an instrument specific GAW expert group.

Points to note:

  • Most of the information entering the header needs to be collected only for the first submission. For the first submission, it is easiest to copy the example, and to adapt it to your station. However, when "recycling" the header for a new submission, please do make sure that the information is current, and update where necessary.
  • 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.
  • Boundary and Spike Checks: Submitted data will be checked for boundaries, the current specification for boundary checks can be found here.
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 9: Missing flags
Flag Validity Description
999 M Missing measurement, unspecified reason
84 1001
Fiebig, Markus; Someone, Else
NO01L, Norwegian Institute for Air Research, NILU,, Instituttveien 18,, N-2027, Kjeller, Norway
Fiebig, Markus
1 1
2008 01 01 2008 06 24
days from file reference point
1 1 1 1 1 1 1
9999.999999 9999.99 9999.99 999999.999999 999999.999999 999999.999999 9.999999999999999999999999999999999999999999999
end_time of measurement, days from the file reference point
pressure, hPa, Location=instrument internal, Matrix=instrument
temperature, K, Location=instrument internal, Matrix=instrument
pm10_mass, ug/m3, Measurement uncertainty=30%
pm10_mass, ug/m3, Statistics=percentile:15.87, Measurement uncertainty=30%
pm10_mass, ug/m3, Statistics=percentile:84.13, Measurement uncertainty=30%
Data definition: EBAS_1.1
Set type code: TU
Station code: NO0001R
Platform code: NO0001S
Timezone: UTC
File creation: 20090101080000
Startdate: 20080101000000
Revision date: 20080624000000
Statistics: arithmetic mean
Component: pm10_mass
Unit: ug/m3
Matrix: pm10
Period code: 1y
Resolution code: 1h
Sample duration: 1h
Laboratory code: NO01L
Instrument type: optical_particle_counter
Instrument manufacturer: Grimm
Instrument model: 190
Instrument name: Grimm_190_BIR_dry
Instrument serial number: 70810508
Method ref: NO01L_pm10_Grimm190
Orig. time res.: 5s
File name: NO0042R.20080101000000.20080624000000.pm10_mass.pm10.1y.1h.nas
Station GAW-Name: Birkenes Atmospheric Observatory
Station GAW-ID: BIR
Station AIRS-ID: [this line is optional]
Station other IDs: 201(NILUDB)
Station state/province: [this line is optional]
Measurement latitude: 58.380
Measurement longitude: 8.250
Measurement altitude: 220 m
Station land use: Forest
Station setting: Rural
Station latitude: 58.38853
Station longitude: 8.252
Station altitude: 219.0 m
Station name: Birkenes II
Station GAW type: R
Station WMO region: 6
Originator: Fiebig, Markus,, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , N-2027, Kjeller,Norway
Originator: Someone, Else,, Somenice Institute, WOW, Super interesting division, Street18,, X-9999, Paradise,Noway
Submitter: Fiebig, Markus,, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, ,N-2027, Kjeller, Norway
Data level: 2
Version: 1
Version description: initial revision
Measurement height: 4m
Inlet type: Hat or hood
Inlet description: inlet as delivered with instrument, incl. dryer and hat
Humidity/temperature control: Nafion dryer
Humidity/temperature control description:Sample heated to lab temperature and dried to RH < 40%.
Volume std. temperature: 273.15K
Volume std. pressure: 1013.25hPa
Detection limit: 0 ug/m3
Detection limit expl.: Determined only by instrument counting statistics, no detection limit flag used
Measurement uncertainty expl.: typical deviation to impactor and filter reference methods as determined by Burkartetal.,2010.
Zero/negative values code: Zero possible
Zero/negative values: Zero values may appear due to statistical variations at very low concentrations
Standard method: None
Comment: Instrument installed and operated according to manual, drier switch-on threshold set to 40% RH
Acknowledgement: Request acknowledgement details from data originator
start_time end_time p_int T_int pm10 pm10pc15.83 pm10pc84.17 numflag
0.000000 0.041667 839.40 299.80 7.352200 6.616600 8.087700 0.000000000000000000000000000000000000000000000
0.041667 0.083333 9999.99 9999.99 999999.999999 999999.999999 999999.999999 0.999000000000000000000000000000000000000000000

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).