Template for inorganic air/aerosol chemistry (filter-based)


This format should be used for submitting all relevant inorganic components (sulphur, nitrogen, base cations and sea salt ions)
measured in air and aerosols with a filter-based system. Typically a three stage filterpack sampler (the EMEP reference method)
or a denuder system, but also chemical speciation of one filter systems like PM10 and PM2.5.


Points to note:

  • Report sum of nitrogen compounds, i.e. HNO3+NO3 and NH3+NH4 in addition to the concentration of the individual components
  • Include information on filter type(s) and coating solution(s).
  • Include information on both the sampling and analytical instruments
  • Include information on performance in laboratory intercomparison, i.e in EMEP and WMO/GAW for the respective year
  • 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:
lev2.nas

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
147 V Below theoretical detection limit or formal Q/A limit, but a value has been measured and reported and is considered valid
Group 4: Extreme or inconsistent values
Flag Validity Description
410 V Sahara dust event
440 V Reconstructed or recalculated data
459 I Extreme value, unspecified error
460 I Contamination suspected
Group 5: Chemical problem
Flag Validity Description
555 V Pollen and/or leaf contamination, but considered valid
558 V Dust contamination, but considered valid
559 V Unspecified contamination or local influence, but considered valid
565 I Pollen and/or leaf contamination, considered invalid
568 I Dust contamination, considered invalid
591 I Agricultural contamination, considered invalid
599 I Unspecified contamination or local influence
Group 6: Mechanical or instrumental problem
Flag Validity Description
651 V Agricultural activity nearby
652 V Construction/acitivity nearby
658 I Too small air volume
659 I Unspecified sampling anomaly
660 V Unspecified sampling anomaly, considered valid
662 V Too high sampling flow, data considered valid
663 I Too high sampling flow, data considered invalid
664 I Instrument flow(s) too far off target value, considered invalid
665 V Filter damaged, valid
666 I Filter damaged, invalid
668 V Moist or wet filter, valid
669 I Moist or wet filter, invalid
Group 7: Flags used when the value is unknown
Flag Validity Description
780 V Value below detection or quantification limit, data element contains estimated or measured value. Use of flag 147 is encouraged.
781 V Value below detection limit, data element contains detection limit
Group 9: Missing flags
Flag Validity Description
999 M Missing measurement, unspecified reason
111 1001
Aas, Wenche; Someone, Else
NO01L, Norwegian Institute for Air Research, NILU, , Instituttveien 18, , 2007, Kjeller, Norway
Hjellbrekke, Anne
CAMP EMEP
1 1
2018 01 01 2020 10 15
1
days from file reference point
27
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
9.999999 9.99 9.999 9.99 9.999 9.99 9.999 9.99 9.999 9.99 9.999 9.99 9.999 9.99 9.999 9.99 9.999 9.99 9.999 9.99 9.999 9.99 9.999 9.99 9.999 9.99 9.999
end_time of measurement, days from the file reference point
ammonia, ug N/m3, Matrix=air, Medium=Cellulose, Coating/Solution=Oxalic acid, Detection limit=0.01 ug N/m3, QA1 bias=4.0 %, QA1 variability=2.0 %, QA2 bias=6.0 %, QA2 variability=4.0 %
numflag ammonia, no unit
ammonium, ug N/m3, Detection limit=0.01 ug N/m3, QA1 bias=-1.8 %, QA1 variability=1.3 %, QA2 bias=-2.2 %, QA2 variability=1.0 %
numflag ammonium, no unit
calcium, ug/m3, Detection limit=0.01 ug/m3, QA1 outcome=pass, QA1 bias=-27.1 %, QA1 variability=1.4 %, QA2 bias=-3.1 %, QA2 variability=1.8 %
numflag calcium, no unit
chloride, ug/m3, Detection limit=0.01 ug/m3, QA1 bias=-11.0 %, QA1 variability=3.0 %, QA2 bias=-9.9 %, QA2 variability=2.9 %
numflag chloride, no unit
magnesium, ug/m3, Detection limit=0.01 ug/m3, QA1 measure ID=, QA1 date=, QA1 outcome=, QA2 bias=-0.5 %, QA2 variability=2.3 %
numflag magnesium, no unit
nitrate, ug N/m3, Detection limit=0.01 ug N/m3, QA1 bias=-0.1 %, QA1 variability=3.4 %, QA2 bias=-0.3 %, QA2 variability=2.3 %
numflag nitrate, no unit
nitric_acid, ug N/m3, Matrix=air, Medium=Cellulose, Coating/Solution=KOH, Detection limit=0.01 ug N/m3, QA1 bias=8.0 %, QA1 variability=3.0 %, QA2 bias=6.0 %, QA2 variability=2.0 %
numflag nitric_acid, no unit
potassium, ug/m3, Detection limit=0.01 ug/m3, QA1 bias=1.1 %, QA1 variability=1.3 %, QA2 bias=1.3 %, QA2 variability=1.0 %
numflag potassium, no unit
sodium, ug/m3, Detection limit=0.01 ug/m3, QA1 bias=-5.1 %, QA1 variability=2.3 %, QA2 outcome=pass, QA2 bias=-4.9 %, QA2 variability=22.1 %
numflag sodium, no unit
sulphate_total, ug S/m3, Detection limit=0.01 ug S/m3, QA1 bias=-0.7 %, QA1 variability=0.3 %, QA2 bias=-0.4 %, QA2 variability=0.7 %
numflag sulphate_total, no unit
sulphur_dioxide, ug S/m3, Matrix=air, Medium=Cellulose, Coating/Solution=KOH, Detection limit=0.01 ug S/m3, QA1 outcome=pass, QA1 bias=14.0 %, QA1 variability=5.0 %, QA2 bias=4.0 %, QA2 variability=5.0 %
numflag sulphur_dioxide, no unit
sum_ammonia_and_ammonium, ug N/m3, Matrix=air+aerosol, Medium=Teflon+cellulose, Coating/Solution=Oxalic acid, Detection limit=0.01 ug N/m3, QA1 measure ID=, QA1 date=, QA1 outcome=, QA2 measure ID=, QA2 date=, QA2 outcome=
numflag sum_ammonia_and_ammonium, no unit
sum_nitric_acid_and_nitrate, ug N/m3, Matrix=air+aerosol, Medium=Teflon+cellulose, Coating/Solution=KOH, Detection limit=0.01 ug N/m3, QA1 measure ID=, QA1 date=, QA1 outcome=, QA2 measure ID=, QA2 date=, QA2 outcome=
numflag sum_nitric_acid_and_nitrate, no unit
0
70
Data definition: EBAS_1.1
Set type code: TU
Timezone: UTC
File name: NO0001R.20180101070000.20201015093000.filter_3pack.inorganics.aerosol.1y.1d.NO01L_NILU_f3p_d_0001.NO01L_NILU_IC_03.lev2.nas
Startdate: 20180101070000
Revision date: 20201015093000
Version: 1
Version description: initial revision, manually inspected
Statistics: arithmetic mean
Data level: 2
Period code: 1y
Resolution code: 1d
Sample duration: 1d
Orig. time res.: 1d
Station code: NO0001R
Platform code: NO0001S
Station name: Birkenes
Station WDCA-ID: GAWANO__BIR
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
Measurement altitude: 200.0 m
Measurement height: 2.0 m
Regime: IMG
Component: inorganics
Matrix: aerosol
Laboratory code: NO01L
Instrument type: filter_3pack
Instrument name: NILU_f3p_d_0001
Instrument manufacturer: NILU
Instrument model: Three stage open face
Instrument serial number: 12345
Analytical laboratory code: NO01L
Analytical measurement technique: IC
Analytical instrument name: NILU_IC_03
Analytical instrument manufacturer: Dionex
Analytical instrument model: ICS-3000
Analytical instrument serial number: 12345
Standard method: SOP=EMEP_manual_v2014
Inlet type: Hat or hood
Inlet description: Downward facing
Flow rate: 17.4 l/min
Medium: Teflon
Sample preparation: Water extraction after ultrasonic treatment
Blank correction: Blank corrected
Humidity/temperature control: None
Humidity/temperature control description: filter kept at ambient conditions together with sampling head.
Volume std. temperature: ambient
Volume std. pressure: ambient
Detection limit expl.: Determined by taking 3 times standard deviation of ensemble of field blanks
Zero/negative values code: Zero/negative possible
Zero/negative values: Zero/negative values reported as measured if within detection limit, flagged with 780
QA1 measure ID: EMEP35
QA1 date: 20171016
QA1 outcome: pass
QA2 measure ID: EMEP36
QA2 date: 20181022
QA2 outcome: pass
Originator: Aas, Wenche, waa@nilu.no, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway
Originator: Someone, Else, Someone@somewhere.no, Some nice Institute, WOW, Super interesting division, Street 18, , X-9999, Paradise, Noway
Submitter: Hjellbrekke, Anne, agh@nilu.no, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway
Acknowledgement: Request acknowledgement details from data originator
Comment:
starttime endtime NH3 flag_NH3 NH4+ flag_NH4+ Ca++ flag_Ca++ Cl- flag_Cl- Mg++ flag_Mg++ NO3- flag_NO3- HNO3 flag_HNO3 K+ flag_K+ Na+ flag_Na+ SO4-- flag_SO4-- SO2 flag_SO2 NH3+NH4 flag_NH3+NH4 HNO3+NO3 flag_HNO3+NO3
0.291667 1.291667 0.05 0.781 0.21 0.000 0.03 0.000 0.02 0.781 0.04 0.000 0.05 0.000 0.02 0.781 0.12 0.000 0.03 0.000 0.06 0.000 0.05 0.000 0.24 0.000 0.06 0.000
1.291667 2.291667 0.05 0.781 0.24 0.000 0.01 0.781 0.33 0.000 0.01 0.781 0.07 0.000 0.02 0.781 0.04 0.000 0.03 0.000 0.39 0.000 0.06 0.000 0.27 0.000 0.08 0.000
2.291667 3.291667 9.99 0.999 9.99 0.999 9.99 0.999 9.99 0.999 9.99 0.999 9.99 0.999 9.99 0.999 9.99 0.999 9.99 0.999 9.99 0.999 9.99 0.999 9.99 0.999 9.99 0.999
3.291667 4.291667 0.07 0.000 0.09 0.000 0.01 0.781 0.10 0.000 0.01 0.781 0.16 0.000 0.02 0.781 0.01 0.000 0.01 0.781 0.58 0.000 0.02 0.781 0.16 0.000 0.17 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).