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 Annual data reports Data base mirrored on the web

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

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

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

Estonia Corrections received September 2001 EMEP data base updated 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

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)

France Data checking in progress Incorrect flagging of 1999 data corrected

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

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

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

Latvia Corrections sent October 2001 EMEP data base updated 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

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

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

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

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

Slovakia Data have been checked Waiting for corrections to be submitted

Slovenia All data checked by January 2002 No discrepancies found

Sweden Corrections received February 2002 EMEP data base updated 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

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

Status No corrections In progress EMEP data base updated 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

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

Belgium No corrections received

Denmark No corrections received

Germany No corrections received

Greece No corrections received

Iceland No corrections received

Ireland (ESB) No corrections received

JRC Ispra (IT04) No corrections received

Poland No corrections received

Russia No corrections received

Switzerland No corrections received

Turkey No corrections received

United Kingdom No corrections received