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Submit DataData ReportingCommentsCategoryAerosolAerosol Particle MassQA-aerosol-particle-mass    October 1, 2020

Description

QA measure is a general term for different procedures involved in the quality assurance (QA) of the measurements. QA measures can be an on-site or off-site intercomparison, round-robin or an on-site audit. 

All the QA measures need to be identified with a unique ID (QA measure ID). Usually the ID itself provides a reference to the organization defining the QA measure and a reference to the QA procedure. The QA measure ID's are either administered centrally at NILU or at a calibration Centre. It is only possible to use the predefined QA measure IDs. If additional IDs need to be generated, please contact ebas@nilu.no. The QA measure also needs a date (use the enddate if it lasts for a longer period) and a URL where the results can be retrieved. The results can either be site/laboratory specific or it might be a report with the results of the complete QA measure. Which one to use is defined in the different templates.

For some QA measures, it is recommended to also report the statistical results, given as relative bias and variability. Currently this is implemented for inorganic ions and heavy metals in air and precipitation, and EC/OC where annual laboratory intercomparisons are conducted. The results of bias and variability to be included in the data files are calculated centrally; follow the links for the specific templates to download your results.

Note that QA measures can be set in the file global metadata (as the example below). This way it applies to all variables in the file. It could also be overridden for each variable by specifying the metadata in the VNAME lines of the nasa ames file, see this example. In addition, empty metadata values ("tag=") are interpreted as "metadata element not reported". This is used e.g. when resetting the metadata elements for one variable (when it was set to any value in the file global metadata).

More than one QA instance can be relevant for the data contained in a single NASA Ames file. This may happen if the measurements are covered by QA procedures of different networks, or QA measures before and after the data submission interval are relevant. One can state this just by setting numbers 1..n after the QA prefix of the metadata tag (ie QA1 measure ID:), for example:

QA1 measure ID:                       ACTRIS NOx s-b-s 2012
QA1 date:                                   20121116000000
QA1 document URL:                 "http://fp7.actris.eu/Portals/97/deliverables/PU/WP4_D4.6_M24_final_v2.pdf"
QA2 measure ID:                       ACTRIS NO round robin 2012
QA2 date:                                  20121231000000
QA2 document URL:                 "http://fp7.actris.eu/Portals/97/deliverables/PU/WP4_D4.4_M24.pdf" 

Metadata

Description

Ex. Mobility Particle Size Spectrometer 2016 data from Auchencorth Moss:

 

Ex: Inorganic ions in precipitation. (Birkenes NO0001-2015)

QA measure ID:

Unique ID for a workshop, intercomparison exercise, or similar.

MPSS-2016-5

EMEP33

QA date:

(End)date for exercise (format YYYYMMDD)

20160901

20150801

QA document URL:

A pdf describing the results either for the specific instrument or lab, or a summary for the whole measure

http://actris-ecac.eu/files/ECAC-report-MPSS-2016-5-1.pdf

http://www.nilu.no/projects/ccc/intercomparison/qameasure/emep33_G.pdf

Implemented for selected components (inorganic ions, heavy metals, EC/OC):

QA outcome:

pass/no pass related to the data quality objectives (DQO)

 

pass

QA bias

Relative bias from reference value. Marked if systematic. Calculated by the calibration centre (or EMEP/CCC)

 

5.1%

QA variability

 

Relative standard deviation from reference value. Calculated by the calibration Centre (or EMEP/CCC)

 

2.3%

 

Additional metadata generated mainly for export (might be revised):

  • QA measure description
  • QA document name
  • QA measure title
  • QA measure type
  • QA measure responsible instance
  • QA measure URL

List of currently known QA measures

 
Currently known QA measures

QA measure ID  QA measure description Applicable to Calculation of QA bias and QA variability  Additional information
EMEP1
...
EMEP33
EMEP laboratory intercomparison Sulphur dioxide in absorbing solution, nitrogen dioxide in absorbing solution, sulphur dioxide and nitric acid on impregnated filters, ammonia on impregnated filter, inorganics, pH and conductiviy in precipitation, heavy metals in precipitation How to calculate QA variability and bias from the EMEP laboratory intercomparison                                         
ACTRIS-VOC-1 ACTRIS VOC round-robin (Hörger et al., AMT, 2015) NMHC/VOC/OVOC

 
EMEP-ACTRIS-ECOC-2013  EMEP QA based on raw data from ACTRIS inter-comparison) EC/OC

 
EMEP-ACTRIS-ECOC-2015  EMEP QA EC/OC

Example:
QA measure ID:   EMEP-ACTRIS-ECOC-2015
QA date:         20151022
QA document URL: "http://www.nilu.no/projects/ccc/qameasure/ecoc_2015.pdf"
ECAC-OCEC-2016-1  Results of the inter-laboratory comparison exercise for TC and EC measurements EC/OC

Example:
QA measure ID:   ECAC-OCEC-2016-1
QA date:         20160301
QA document URL: "http://www.actris-ecac.eu/files/OCEC-2016-1-report.pdf"
ECAC-OCEC-2016-2  Results of the inter-laboratory comparison exercise for TC and EC measurements EC/OC

Example:
QA measure ID:   ECAC-OCEC-2016-2
QA date:         20161001
QA document URL: "http://www.actris-ecac.eu/files/OCEC-2016-2-REPORT.pdf"
ECAC-OCEC-2017-1  Results of the inter-laboratory comparison exercise for TC and EC measurements EC/OC

Example:
QA measure ID:   ECAC-OCEC-2017-1
QA date:         20170301
QA document URL: "http://www.actris-ecac.eu/files/ECAC-report-OCEC-2017-1.pdf"
ECAC-OCEC-2017-2  Results of the inter-laboratory comparison exercise for TC and EC measurements EC/OC

Example:
QA measure ID:   ECAC-OCEC-2017-2
QA date:         20170901
QA document URL: "http://www.actris-ecac.eu/files/OCEC-2017-2-REPORT.pdf"
EMEP-ACTRIS-Levoglucosan-2013  EMEP QA based on raw data from ACTRIS inter-comparison) Levoglucosan

 
WCC Empa Site Audit  World Calibration Centre (WCC-Empa) for Surface Ozone, Carbon Monoxide, Methane and Carbon Dioxide Site Audits ozone, carbon_monoxide, carbon_dioxide, methane
bias = slope of the residual regression line (in %)
variability = arithmetic mean of the distance of all values from the residual regression line
 
<LAB_CODE>_reference_calibration_<DateYYYYMMDD>  Generic QA measure, in cases where a laboratory standard (traceable to a national or international standard) is used to calibrate the filed instrument. More information can be found at the QA metadata description page for the ozone submission template. ozone
bias = slope of the residual regression line (in %)
variability = arithmetic mean of the distance of all values from the residual regression line

 
ACTRIS NO round robin 2012 ACTRIS WP4- NA4: Trace gases networking: Volatile organic carbon and nitrogen oxides
Deliverable D4.4: Results of Round Robin exercise of NO
 NOx   Example:
QA measure ID:   ACTRIS NO round robin 2012
QA date:         20121231
QA document URL: "http://fp7.actris.eu/Portals/97/deliverables/PU/WP4_D4.4_M24.pdf"
ACTRIS NOx s-b-s 2012 ACTRIS WP4- NA4: Trace gases networking: Volatile organic carbon and nitrogen oxides
Deliverable D4.6: Results of NOx side-by-side inter-comparison exercise of ambient air and test gases
 NOx   Example:
QA measure ID:   ACTRIS NOx s-b-s 2012
QA date:         20121116
QA document URL: "http://fp7.actris.eu/Portals/97/deliverables/PU/WP4_D4.6_M24_final_v2.pdf"
EMEP_AMAP_POP_2010 AMAP/EMEP/NCP inter-laboratory study for POP analysis 2010  Persistent organic pollutants   Example:
QA1 measure ID:   EMEP_AMAP_POP_2010
QA date:         20100701
QA document URL: "https://www.nilu.no/projects/ccc/reports/cccr7-2011.pdf"
WCCAP-CPC-<year>-<number> Calibration workshops and laboratory intercomparisons of Condensation Particle Counter  Condensation Particle Counter   Example:
QA measure ID:   WCCAP-CPC-2016-5
QA date:         20160927
QA document URL: "http://www.actris-ecac.eu/files/ECAC-report-CPC-2016-5-1.pdf"


A list of reports could be found here:
http://www.actris-ecac.eu/condensation-particle-counter.html
WCCAP-MPSS-<year>-<number> Calibration workshops and laboratory intercomparisons of Mobility Particle Size Spectrometers Mobility Particle Size Spectrometer   Example:
QA measure ID:   WCCAP-MPSS-2016-5
QA date:         20160912
QA document URL: "http://www.actris-ecac.eu/files/ECAC-report-MPSS-2016-5-7.pdf"


A list of reports could be found here:
http://www.actris-ecac.eu/mobility-particle-size-spectrometer.html
WCCAP-AP-<year>-<number> Calibration workshops and laboratory intercomparisons of Absorption Photometers  Absorption Photometer    Example:
QA measure ID:   WCCAP-AP-2015-1
QA date:         20150925
QA document URL: "http://www.actris-ecac.eu/files/ECAC-report-AP-2015-1-1_ISSeP_AE22-1083.pdf"


A list of reports could be found here:
http://www.actris-ecac.eu/absorption-photometer.html
WCCAP-IN-<year>-<number> Calibration workshops and laboratory intercomparisons of Integrating Nephelometers
Integrating Nephelometer    Example:
QA measure ID:   WCCAP-IN-2016-1
QA date:         20160618
QA document URL: "http://www.actris-ecac.eu/files/ECAC_report_IN-2016-1-3_PSI_TSI3563-1043.pdf"


A list of reports could be found here:
http://www.actris-ecac.eu/integrating-nepehlometer.html
WCCAP-CCNC-<year>-<number>  Calibration workshops and laboratory intercomparisons of Cloud Condensation Nuclei Counter Cloud Condensation Nuclei Counter     
WCCAP-ACSM-<year>-<number>
Calibration workshops and laboratory intercomparisons of Aerosol Chemical Speciation Monitors
Aerosol Chemical Speciation Monitor    Example:
QA measure ID:   WCCAP-ACSM-2016-1
QA date:         20160314
QA document URL: "http://www.actris-ecac.eu/files/ECAC-report-ACSM-2016-1-4.pdf"


A list of reports could be found here:
http://www.actris-ecac.eu/aerosol-chemical-speciation-monitor.html

If you perform a QA measure which is not listed here, but you want to refer to, please write an email to ebas@nilu.no.

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