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Status of the measurement data checking process

Status of the measurement data checking process. Anne Hjellbrekke, NILU. EMEP data flow . Data submitted should be quality controlled and in correct format Format check/conversion Quality control; corrections/flagging in cooperation with data submitters Storage in EMEP data base

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Status of the measurement data checking process

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  1. Status of the measurement data checking process Anne Hjellbrekke, NILU

  2. EMEP data flow • Data submitted should be quality controlled and in correct format • Format check/conversion • Quality control; corrections/flagging in cooperation with data submitters • Storage in EMEP data base • Annual data reports • Data base mirrored on the web

  3. Austria • NO2 and SO2 data deleted due to instrumental problems (DOAS): • AT02 Nov 1995 – Mar 1999 • AT04 Jul 1993 – Apr 1999 • EMEP and national data base compared and equal • EMEP data base updated

  4. Croatia • All precipitation data from Nov 1980 to Dec 2001 resubmitted in excel August 2002 • 1997-2000 have never been reported to EMEP • Data from the two stations swapped in 1994 • Data missing mid Oct-Dec 1991 and Oct-Dec 1993 (HR02) • Ca and Cl 1996 stored with one decimal • A few samples shifted one day • Single values corrected (amount) • SO2/NO2 data are of questionable quality and flagged as invalid • BDL values not reported • EMEP data base updated for 1980-1996

  5. Czech Republic • Corrections sent Feb/Aug/Oct 2002 • Ozone data 1989-1991 deleted • Ozone data 1993-1997 realculated by CHMI • Ammonia in air at CZ01 1990-1992 flagged as invalid • Corrected air data sets (SO2 1991, HNO3 1993, NH4 1992) • One day shift in daily data 1998 and 1999 • NH4 (p) stored as mg NH4/l • Single values corrected for precip data 1977-1999, mainly precipitation amount • EMEP data base updated

  6. Estonia • Corrections received September 2001 • Missing SO4 (a) at EE09 1996 submmitted • NO2 at EE09 1.1.1999 – 26.10.1999 missing on the web (bug in file conversion routines) • EMEP data base updated

  7. Finland • Corrections received January 2002 • FI04 Apr – Dec 1986: NH4+ (p) and NO3- (p) swapped • FI37 1997: All daily data shifted 6 months (bug in file conversion) • Wrong unit for conductivity (FI04/FI07 1986, FI09 1986-1988) • Different reference temperature for NO2: 0º C 1990-1993, 20º C from 1994 • Daily means for NO2 calculated from 0 – 0 UTC, while daily measurements are 6 – 6 UTC. • EMEP data base mostly updated (waiting for resubmission of hourly NO2 data)

  8. France • Data checking in progress • Incorrect flagging of 1999 data corrected

  9. Hungary • No corrections received • Measurements are routinely compared with EMEP data base

  10. Ireland (Met Eireann) • Corrections received October 2002 • Conductivity missing February 1992 • Detection limit for NH4 and NO3 1986-1992 corrected from 0.02 to 0.01 • A few single corrections for most components • One sample missing the Met Eireann data base • EMEP data base not yet updated

  11. Italy (IT01) • Corrections sent August 2002 • NH3 1998 stored as ug NH3/m3 • SO2 1999 stored as ug SO2/m3 • Monthly mean values corrected for SO2, NO3 and SO4 1994; waiting for resubmission of raw data

  12. Latvia • Corrections sent October 2001 • Ca 1993 • NH4 1993, K/SO2/SO4 (a) 1994 (BDL flags) • sNO3 1994, sNH4 1994 • New data set for NO2 Jan 1990 – May 1991 (stored as ug NO2/m3) • EMEP data base updated

  13. Lithuania • Corrections received February 2002 • NH3 and HNO3 data from 1992 swapped • A few single values corrected, mainly NO2 1992 and SO2 1996 • EMEP data base updated

  14. Netherlands • Have been in contact regarding format for submitting corrections • No corrections received

  15. Norway • Comparison of EMEP data base with national data base did not reveal any significant discrepancies • NH3+NH4 at NO55 flagged as invalid

  16. Portugal • Precipitation data from 1998 and 1999 resubmitted • precipitation amount from 1998 are official gauge • lots of data missing, mainly small precipitation amounts • EMEP data base updated

  17. Slovakia • Data have been checked • Waiting for corrections to be submitted

  18. Slovenia • All data checked by January 2002 • No discrepancies found

  19. Sweden • Corrections received February 2002 • A few data sets resubmitted: • NO2 SE02/SE05/SE08 1981-1982 • NH3+NH4 and HNO3+NO3 SE02 1996 • SO2 SE02 1988 • NH3+NH4 SE05 1999 • Single values • Precipitation amount flagged with 599 (invalid) • Acidity / pH • Aggregates on web when data capture is low • EMEP data base updated

  20. Yugoslavia • Corrections for sulphur compounds in air and precipiation received on paper (June 2001) • All compounds should be checked and submitted electronically • EMEP data base not updated

  21. Status • No corrections • Belgium, Denmark, Germany, Greece, Iceland, Ireland (ESB), JRC Ispra, Poland, Russia, Switzerland, Turkey, UK • In progress • France, Netherlands, Slovakia • EMEP data base updated • except Croatia 1997-2000, Ireland

  22. Common problems • Data checking not complete • Most corrections are on single values • Early data not in defined electronic format • Lack of control of published values • Errors when mirroring data on web • Poor documentation in countries • Documentation of metadata

  23. Belgium • No corrections received

  24. Denmark • No corrections received

  25. Germany • No corrections received

  26. Greece • No corrections received

  27. Iceland • No corrections received

  28. Ireland (ESB) • No corrections received

  29. JRC Ispra (IT04) • No corrections received

  30. Poland • No corrections received

  31. Russia • No corrections received

  32. Switzerland • No corrections received

  33. Turkey • No corrections received

  34. United Kingdom • No corrections received

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