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 by Gravimetric Filter Analysis (level 2 data)

Below, you find an example of a data file reporting measurements of aerosol particulate mass concentration measured by gravimetric filter analysis. The format has been designed to make data reporting a 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:

Clicking on a specific line in the example template will provide a detailed explanation and possible options for each of the metadata elements. Please contact ebas@nilu in case of broken links etc.

  • 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.
  • A complete list of EBAS metadata elements and there relevance
  • 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
53 1001
Aas, Wenche
NO01L, Norwegian Institute for Air Research, NILU, , Instituttveien 18, , 2007, Kjeller, Norway
Hjellbrekke, Anne
1 1
2010 01 01 2017 10 10
days from file reference point
1 1 1
99.999999 99.999 9.999
end_time of measurement, days from the file reference point
pm10_mass, ug/m3
numflag pm10_mass, no unit
Data definition: EBAS_1.1
Set type code: TU
Timezone: UTC
File name: NO0001R.20091230070000.20171010195500.low_vol_sampler.pm10_mass.pm10.5w.1w.NO01L_kfg_no01.NO01L_Thermo_Optical-Sunset_Lab.lev2.nas
File creation: 20201211144520075825
Startdate: 20091230070000
Revision date: 20171010195500
Statistics: arithmetic mean
Data level: 2
Period code: 5w
Resolution code: 1w
Station code: NO0001R
Platform code: NO0001S
Station name: Birkenes
Station GAW-ID: BIR
Station GAW-Name: Birkenes Atmospheric Observatory
Station other IDs: 201(NILUDB)
Station land use: Forest
Station setting: Rural
Station GAW type: R
Station WMO region: 6
Station latitude: 58.383333
Station longitude: 8.25
Station altitude: 190.0 m
Regime: IMG
Component: pm10_mass
Unit: ug/m3
Matrix: pm10
Laboratory code: NO01L
Instrument type: low_vol_sampler
Instrument name: kfg_no01
Method ref: NO01L_Thermo_Optical-Sunset_Lab
Originator: Aas, Wenche,, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway, ORCID=0000-0002-2908-1970
Submitter: Hjellbrekke, Anne,, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway
starttime endtime PM10 flag_PM10
-1.708333 5.291667 2.916 0.000
5.291667 12.291667 1.277 0.000
12.291667 19.291667 6.111 0.000
19.291667 26.291667 6.728 0.000
26.291667 33.291667 9.023 0.000

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).