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Submit DataData ReportingTemplatesCategoryAerosolEC-OCEC-OC online    October 1, 2020

Template for OC/EC online measurements (semi-continuous) - level 2

The present format should be used when submitting organic carbon (OC), elemental carbon (EC) and total carbon (TC) data, measured online with semi-continuous OC-EC field analyzers.

Points to note:

  • Parameters:
    OC, EC, TC, and their calculated uncertainties, subfractions OC1-4 and OCpyr should be reported as separate time series.
  • OC, EC and TC
    should be reported as measured, corresponding to the amount detected on the aerosol filter sample. I.e. data should not be corrected for positive and/or negative sampling artifacts or carbonate carbon.
  • Positive and negative artefacts:
    If analyzed, positive and negative artefacts should be reported as a separate time series
  • Unit:
    The unit is μg C m-3, not μg m-3
  • Atmospheric conditions
    All data should be reported as ambient (not converted to standard contitions). If measured, temperature and pressure data shall be included.
  • Uncertainty calculations:
    Calculate the uncertainties of your analyses. This should be done by following the examples provided here (made by Jean-Philippe Putaud).
  • Matrix:
    If you choose as matrix e.g. pm10, pm25 or pm1, this must be combined with an appropriate Inlet type, e.g. direct impactor, not e.g. hat or hood, which imply a TSP kind of inlet.
  • Filter face velocity:
    When calculating the filter face velocity, remember to use the exposed area, and not the area of the entire filter.
  • Filter pre-firing:
    Note that temperatures shall be given in Kelvin, also the duration of the pre-firing shall be included.
  • Artifact correction description:
    Describe how your sampling device accounts for sampling artifacts of OC. The following link gives examples on how data users can calculate corrected values for OC.
  • Detection limit:
    The detection limit can vary for OC, EC and TC, thus include the detection limit along with the name of the actual time series.
  • Detection limit description:
    The detection limit is often calculated as 3 times the standard deviation of the fieldblanks. For OC/EC this can be challenging, e.g. because fieldblanks may not be particularly representative for OC, and because they typically do not contain EC. Use this freetext point to describe how the fieldblanks were obtained.
  • Boundary and Spike Checks:
    Submitted data will be checked for boundaries, the current specification for boundary checks can be found here.

Downloading template as text file

You could download the template and start to modify the text with your own metadata. Due to limitations of the online portal we could not provide files with the .nas file extension. So please download the text file and edit, and remember to use the .nas file-extension when you create your datafile: EC-OC_online_lev2.txt

Validation and submission:

To validate the file, please use the EBAS Submission Tool

Flags commonly used with this format:

All the flags defined for EBAS can be used, and the data submitter is encourage to go through the list of all EBAS flags prior to submitting to ensure that appropriate flagging is done.
Flags are grouped in four categories: V (valid measurement), I (invalid measurement), M (missing measurement) or H (hidden and invalid measurements)..
Apply '000' for valid measurements without any annotations.
The most common flags for these measurements are:

Group 9: Missing flags

999MMissing measurement, unspecified reason

Group 7: Flags used when the value is unknown

781VValue below detection limit, data element contains detection limit
780VValue below detection or quantification limit, data element contains estimated or measured value. Use of flag 147 is encouraged.

Group 6: Mechanical or instrumental problem

669IMoist or wet filter, invalid
668VMoist or wet filter, valid
666IFilter damaged, invalid
665VFilter damaged, valid
664IInstrument flow(s) too far off target value, considered invalid
663IToo high sampling flow, data considered invalid
662VToo high sampling flow, data considered valid
660VUnspecified sampling anomaly, considered valid
659IUnspecified sampling anomaly
658IToo small air volume
652VConstruction/acitivity nearby
651VAgricultural activity nearby

Group 5: Chemical problem

599IUnspecified contamination or local influence
591IAgricultural contamination, considered invalid
565IPollen and/or leaf contamination, considered invalid
559VUnspecified contamination or local influence, but considered valid
558VDust contamination, but considered valid
555VPollen and/or leaf contamination, but considered valid

Group 4: Extreme or inconsistent values

471IParticulate mass concentration higher than parallell mass concentration measurement with higher cut off i.e PM1_mass > PM25_mass and PM25_mass > PM10_mass. Considered invalid
470VParticulate mass concentration higher than parallell mass concentration measurement with higher cut off i.e PM1_mass > PM25_mass and PM25_mass > PM10_mass
460IContamination suspected
459IExtreme value, unspecified error

Group 1: Exception flags for accepted, irregular data

147VBelow theoretical detection limit or formal Q/A limit, but a value has been measured and reported and is considered valid

Template for Data Submission:

Clicking on a specific line in the example template will provide a detailed explanation and possible options for each of the metadata elements.

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!

117 1001
Aas, Wenche; Someone, Else
NO01L, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway
Hjellbrekke, Anne
1 1
2016 01 01 2017 09 18
days from file reference point
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
9999.999999 99.999 9.999999999 99.999 9.999999999 99.999 9.999999999 99.999 9.999999999 99.999 9.999999999 99.999 9.999999999 99.999 9.999999999 99.999 9.999999999 99.999 9.999999999 99.999 9.999999999 99.999 9.999999999 99.999 9.999999999 99.999 9.999999999 9999.99 9.999999999 99999.99 9.999999999
end_time of measurement, days from the file reference point
total_carbon, ug C/m3, Detection limit=0.4 ug C/m3
numflag total_carbon, no unit
total_carbon, ug C/m3, Statistics=uncertainty
numflag total_carbon, no unit, Statistics=uncertainty
elemental_carbon, ug C/m3, Detection limit=0.4 ug C/m3
numflag elemental_carbon, no unit
elemental_carbon, ug C/m3, Statistics=uncertainty
numflag elemental_carbon, no unit, Statistics=uncertainty
organic_carbon, ug C/m3, Detection limit=0.4 ug C/m3
numflag organic_carbon, no unit
organic_carbon, ug C/m3, Statistics=uncertainty
numflag organic_carbon, no unit, Statistics=uncertainty
organic_carbon, ug C/m3, Artifact=positive
numflag organic_carbon, no unit, Artifact=positive
organic_carbon, ug C/m3, Artifact=positive, Statistics=uncertainty
numflag organic_carbon, no unit, Artifact=positive, Statistics=uncertainty
organic_carbon, ug C/m3, Fraction=OC1
numflag organic_carbon, no unit, Fraction=OC1
organic_carbon, ug C/m3, Fraction=OC2
numflag organic_carbon, no unit, Fraction=OC2
organic_carbon, ug C/m3, Fraction=OC3
numflag organic_carbon, no unit, Fraction=OC3
organic_carbon, ug C/m3, Fraction=OC4
numflag organic_carbon, no unit, Fraction=OC4
organic_carbon, ug C/m3, Fraction=OCPyr
numflag organic_carbon, no unit, Fraction=OCPyr
temperature, K
numflag temperature, K
pressure, hPa
numflag pressure, hPa

Data definition: EBAS_1.1
Set type code: TU
Timezone: UTC
File name: NO0002R.20160101000000.20170918113000.online_thermal-optical_analysis.oc_ec_tc.pm25.1y.4h.NO01L_NILU_sunset_mod4_Bir.NO01L_thermal-optical_analysis_EUSAAR_2.lev2.nas
Startdate: 20160101000000
Revision date: 20170918113000
Version: 1
Version description: initial revision, manually inspected
Data level: 2
Period code: 1y
Resolution code: 4h
Sample duration: 225mn
Orig. time res.: 4h
Station code: NO0002R
Platform code: NO0002S
Station name: Birkenes II
Station GAW-ID: BIR
Station GAW-Name: Birkenes Atmospheric Observatory
Station AIRS-ID:
Station other IDs:
Station state/province:
Station land use: Forest
Station setting: Rural
Station GAW type: R
Station WMO region: 6
Station latitude: 58.38853
Station longitude: 8.252
Station altitude: 219.0 m
Measurement latitude: 58.2318
Measurement longitude: 8.1507
Measurement altitude: 212.0 m
Measurement height: 4.0 m

Component: oc_ec_tc
Unit: ug C/m3
Matrix: pm25
Laboratory code: NO01L
Instrument type: online_thermal-optical_analysis
Instrument name: NILU_sunset_mod4_Bir
Instrument manufacturer: Sunset Laboratory
Instrument model: Model-4 Semi-Continuous Field Analyzer
Instrument serial number: 9635
Method ref: NO01L_thermal-optical_analysis_EUSAAR_2
Standard method: TEMP=EUSAAR_2
Inlet type: Cyclone
Inlet description: with rain hat
Flow rate: 8.0 l/min
Filter face velocity: 108.4 cm/s
Exposed filter area: 1.23 cm2
Filter description: Circular 16.5 mm diameter punches cut from WhatmanQM-A47mm
Medium: Quartz
Filter prefiring: Prefired by previous analysis
Filter conditioning: None
Sample preparation: None
Blank correction: Not blank corrected
Artifact correction: Positive only
Artifact correction description: The positive artifact of OC was accounted for by placing a denuder upstream of the instrument. The denuder collection efficiency is 91 %. The remaining positive artifact due to the inefficiency is reported in a separate variable (Artifact=positive).
Charring correction: By laser transmission
Humidity/temperature control: None
Humidity/temperature control description:
Volume std. temperature: ambient
Volume std. pressure: ambient
Detection limit expl.: Determined by taking 3 times standard deviation of ensemble of field blanks
Measurement uncertainty expl.: Measurement uncertainty includes quantifiable uncertainty
Zero/negative values code: Zero/negative possible
Zero/negative values: Zero/negative values reported as measured if within detection limit, flagged with 780
Originator: Aas,Wenche,, 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, Street18, , 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
start_time end_time TC TC_flag TC_unc TC_unc_flag EC EC_flag EC_unc EC_unc_flag OC OC_flag OC_unc OC_unc_flag OC_pos OC_pos_flag OC_unc_pos OC_unc_pos_flag OC_peak1 OC_peak1_flag OC_peak2 OC_peak2_flag OC_peak3 OC_peak3_flag OC_peak4 OC_peak4_flag OC_Pyr OC_Pyr_flag temp temp_flag press press_flag
0.000000 0.156250 0.372 0.000000000 0.079 0.000000000 0.066 0.000000000 0.006 0.000000000 0.306 0.000000000 0.076 0.000000000 0.028 0.000000000 0.003 0.000000000 0.038 0.000000000 0.059 0.000000000 0.068 0.000000000 0.049 0.000000000 0.092 0.000000000 251.71 0.000000000 997.21 0.000000000
0.166667 0.322917 1.073 0.000000000 0.136 0.000000000 0.150 0.000000000 0.014 0.000000000 0.923 0.000000000 0.126 0.000000000 0.083 0.000000000 0.008 0.000000000 0.097 0.000000000 0.132 0.000000000 0.076 0.000000000 0.080 0.000000000 0.535 0.000000000 250.23 0.000000000 997.73 0.000000000
0.333333 0.489583 0.516 0.000000000 0.103 0.000000000 0.086 0.000000000 0.008 0.000000000 0.430 0.000000000 0.100 0.000000000 0.039 0.000000000 0.004 0.000000000 0.063 0.000000000 0.080 0.000000000 0.073 0.000000000 0.059 0.000000000 0.156 0.000000000 249.88 0.000000000 998.43 0.000000000
0.500000 0.656250 0.594 0.000000000 0.107 0.000000000 0.175 0.000000000 0.017 0.000000000 0.419 0.000000000 0.099 0.000000000 0.038 0.000000000 0.004 0.000000000 0.042 0.000000000 0.059 0.000000000 0.076 0.000000000 0.066 0.000000000 0.174 0.000000000 249.21 0.000000000 998.62 0.000000000
0.666667 0.822917 99.999 0.999000000 99.999 0.999000000 99.999 0.999000000 99.999 0.999000000 99.999 0.999000000 99.999 0.999000000 99.999 0.000000000 99.999 0.000000000 99.999 0.999000000 99.999 0.999000000 99.999 0.999000000 99.999 0.999000000 99.999 0.999000000 9999.99 0.999000000 9999.99 0.999000000

Version Information:

Last Change: 2020-06-18 10:54:04 UTC

  • added boundary checks

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