List of flags used in ebas

All flags are grouped in four categories: V (valid measurement), I (invalid measurement), M (missing measurement) or H (hidden and invalid measurements).

 
Flag V/I/H Description
Group 9: Missing flags
999 M Missing measurement, unspecified reason
990 M Precipitation not measured due to snow-fall. Needed for historic data, should not be needed for new data
980 M Missing due to calibration or zero/span check
900 H Hidden and invalidated by data originator
Group 8: Flags for undefined data elements
899 M Measurement undefined, unspecified reason
890 M Concentration in precipitation undefined, no precipitation
Group 7: Flags used when the value is unknown
799 I Measurement missing (unspecified reason), data element contains estimated value
798 V Measurement missing (unspecified reason), data element contains estimated value. Considered valid.
797 V Data element taken from co-located instrument
784 I Low precipitation, concentration estimated
783 M Low precipitation, concentration unknown
782 V Low precipitation, concentration estimated
781 V Value below detection limit, data element contains detection limit
780 V Value below detection or quantification limit, data element contains estimated or measured value. Use of flag 147 is encouraged.
771 V Value above range, data element contains upper range limit
770 V Value above range, data element contains estimated value
760 V Value estimated by summing up the constituents measured
750 M H+ not measured in alkaline sample
741 V Non refractory AMS concentrations. Don't include compounds that volatalises above 600 deg C
740 V Probably biased gas/particle ratio
701 I Less accurate than usual, unspecified reason. (Used only with old data, for new data see groups 6 and 5)
Group 6: Mechanical or instrumental problem
699 I Mechanical problem, unspecified reason
685 I Invalid due to secondary standard gas measurement. Used for Level 0.
684 I Invalid due to zero/span check. Used for Level 0.
683 I Invalid due to calibration. Used for Level 0.
682 I Invalid due to calibration or zero/span check. Used for Level 0.
681 I Low data capture
680 V Undefined wind direction
679 V Unspecified meteorological condition
678 V Hurricane
677 I Icing or hoar frost in the intake
676 V station inside cloud (visibility < 1000 m)
675 V no visibility data available
674 V Icing or hoar frost in the intake, considered valid
670 I Incomplete data acquisition for multi-component data sets
669 I Moist or wet filter, invalid
668 V Moist or wet filter, valid
666 I Filter damaged, invalid
665 V Filter damaged, valid
664 I Instrument flow(s) too far off target value, considered invalid
663 I Too high sampling flow, data considered invalid
662 V Too high sampling flow, data considered valid
660 V Unspecified sampling anomaly, considered valid
659 I Unspecified sampling anomaly
658 I Too small air volume
657 V Precipitation collector overflow. Heavy snowfall/rain shower (squall)
656 V Wet-only collector failure, operated as bulk collector
655 V Estimated value created by averaging or splitting samples
654 V Sampling period longer than normal, considered representative. Observed values reported
653 V Sampling period shorter than normal, considered representative. Observed values reported
652 V Construction/acitivity nearby
651 V Agricultural activity nearby
650 V Precipitation collector failure
649 V Temporary power fail has affected sampler operation
648 V Snow sampler
647 V Fire/wood burning nearby
646 I Exceptional traffic nearby
645 V Exceptional traffic nearby
644 V Low instrument precision and/or calibration issues
641 I Aerosol filters installed incorrectly
640 V Instrument internal relative humidity above 40%
635 I Internal temperatures too far off target value, considered invalid
632 V Lid of polyurethane foam (PUF) sampler not closed
630 V POP concentration from the polyurethane foam (PUF) only
620 I Too high filter breakthrough, considered invalid
Group 5: Chemical problem
599 I Unspecified contamination or local influence
593 I Industrial contamination, considered invalid
591 I Agricultural contamination, considered invalid
578 I Large sea salt contribution (ratio between marine and excess sulphate is larger than 2.0). Used for old data only. For newer data use 451/450.
568 I Dust contamination, considered invalid
567 I Insect contamination, considered invalid
566 I Bird droppings, considered invalid
565 I Pollen and/or leaf contamination, considered invalid
559 V Unspecified contamination or local influence, but considered valid
558 V Dust contamination, but considered valid
557 V Insect contamination, but considered valid
556 V Bird droppings, but considered valid
555 V Pollen and/or leaf contamination, but considered valid
549 I Impure chemicals
541 I Gold trap passiviated by unknown compound
540 I Spectral interference in laboratory analysis
534 I Wrong coated denuder used
533 I Filters mixed up; incorrect analysis
532 V Data less accurate than normal due to high field blank value
531 V Low recovery, analysis inaccurate
530 I Invalid due to too low or too high recovery
521 V Bactericide was added to sample for storage under warm climate. Considered valid
Group 4: Extreme or inconsistent values
499 V Inconsistent with another unspecified measurement
498 V Gold trap inconsistency in mercury monitor
478 I Invalid due to inconsistency discovered through ion balance calculations
477 I Invalid due to inconsistency between measured and estimated conductivity
476 V Inconsistency discovered through ion balance calculations, but considerd valid
475 V Inconsistency between measured and estimated conductivity, but considerd valid
472 V Less accurate than normal due to high concentration(s)
471 I Particulate 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.
470 V Particulate mass concentration higher than parallell mass concentration measurement with higher cut off 
i.e PM1_mass > PM25_mass and PM25_mass > PM10_mass
460 I Contamination suspected
459 I Extreme value, unspecified error
458 V Extremely high value, outside four times standard deviation in a lognormal distribution
457 V Extremely low value, outside four times standard deviation in a lognormal distribution
456 I Invalidated by data originator
452 I Invalid due to large uncertainty
451 I Invalid due to large sea salt contribution
450 V Considerable sea salt contribution, but considered valid
440 V Reconstructed or recalculated data
420 V Preliminary data
410 V Sahara dust event
Group 3: Flags for aggregated datasets
395 I Data completeness less than 90%
394 V Data completeness less than 90%
393 I Data completeness less than 75%
392 V Data completeness less than 75%
391 I Data completeness less than 50%
390 V Data completeness less than 50%
389 I Data completeness less than 66%
388 V Data completeness less than 66%
382 V More than 75% of the measurements are below detection limit
380 V More than 50% of the measurements are below detection limit
370 V For monthly averages with samples partly in two months, the number of days in each month is used for weighing the sample
Group 2: Exception flags assigned by the database co-ordinator
299 V Inconsistent with another unspecified measurement
298 V Gold trap inconsistency in mercury monitor
278 I Invalid due to inconsistency discovered through ion balance calculations
277 I Invalid due to inconsistency between measured and estimated conductivity
276 V Inconsistency discovered through ion balance calculations, but considered valid
275 V Inconsistency between measured and estimated conductivity, but considered valid
260 I Contamination suspected
259 I Unspecified error expected
258 V Extremely high value, outside four times standard deviation in a log-normal distribution
257 V Extremely low value, outside four times standard deviation in a log-normal distribution
256 I Invalidated by database co-ordinator
251 I Invalid due to large sea salt contribution
250 V Considerable sea salt contribution, but considered valid
249 V Apparent typing error corrected. Valid measurement
248 V Illegal flag was removed by the database co-ordinator. Lost flag information (used for historic data only).
247 V Overlapping sample interval was corrected by the database co-ordinator. Possible wrong sample time (used for historic data only)
220 V Preliminary data
211 V Irregular data checked and accepted by database co-ordinator. Valid measurement
210 V Episode data checked and accepted by database co-ordinator. Valid measurement
Group 1: Exception flags for accepted, irregular data
191 V Data not truncation corrected - Valid measurement
190 V Not corrected for cross-sensitivity to particle scattering
189 V Possible local contamination indicated by wind from contaminated sector (auto)
188 V Possible local contamination indicated by low wind speed (auto)
187 V Possible local contamination indicated by occurence of new particles (auto)
186 V Possible local contamination indicated by single scattering albedo (auto)
185 V Possible local contamination indicated by wind direction or velocity
147 V Below theoretical detection limit or formal Q/A limit, but a value has been measured and reported and is considered valid
120 V Sample reanalysed with similar results. Valid measurement
111 V Irregular data checked and accepted by data originator. Valid measurement
110 V Episode data checked and accepted by data originator. Valid measurement
103 V CV of replicate ALPHA samplers > 15 %;. Valid measurement
102 V CV of replicate diffusion tubes > 30 %. Valid measurement
101 V Denuder capture efficiency < 75%. Valid measurement
100 V Checked by data originator. Valid measurement, overrides any invalid flags
Group 0: Valid data
000 V Valid measurement


Last updated: August 2016 by Anne Hjellbrekke