GAW Patnership with BIPM (International Metrology)
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1 GAW Patnership with BIPM (Internatinal Metrlgy) J. Vialln, BIPM GAW Sympsium April 2017, WMO, Geneva
2 The BIPM / Internatinal Metrlgy The BIPM is an intergvernmental rganizatin established by the Metre Cnventin, thrugh which Member States act tgether n matters related t measurement science and measurement standards. The Internatinal Bureau f Weights and Measures has the mandate t prvide the basis fr a single, cherent system f measurements thrughut the wrld, traceable t the SI (Internatinal System f Units). 2
3 BIPM & WMO 2010 WMO has signed the CIPM-Mutual Recgnitin Arrangement Measurements within GECOS are challenging fr the metrlgy cmmunity: Small variatins in space/time => lw uncertainty (GHGs) Satellite based bservatins => pre-launch calibratin/pst-launch validatin Lng term measurements => availability/stability f reference materials/standard instruments 3
4 BIPM & GAW cmmn areas f interest BIPM/NMIs Air Quality NO, NO 2, O 3, VOCs, PM Envirnment GHGs, PM Energy Natural Gas, Hydrgen, liquefied energy gases Reactive gases at trace levels CO 2, CH 4, N 2 O, Black Carbn CO 2 istpes GAW Greenhuse Gases CO2 and its istpes, CH4 and its istpes, N2/O2 rati, N2O, SF6, CFCs and substitutes Reactive Gases (O3, CO, VOCs, NOx, SO2) UV Radiatin GAW Urban Meterlgy GURME Precipitatin Chemistry Aersls chemical and physical prperties, AOD 4
5 BIPM & GAW WMO/GAW an imprtant stakehlder fr BIPM / NMIs (Natinal Metrlgy Institutes) GAW fcal areas BIPM/NMIs activities Stratspheric Ozne and vertical zne distributin Greenhuse Gases (CO 2 and its istpes, CH 4 and its istpes, N 2 /O 2 rati, N 2 O, SF 6, CFCs and substitutes) Reactive Gases (O 3, CO, VOCs, NO x, SO 2 ) Aersls (chemical and physical prperties, AOD) PMOD & NMIs cperate in ATMOZ (traceability fr atmspheric ttal clumn zne). Fcus n Brewer & Dbsn instruments. Key cmparisns f natinal standards fr CO 2, CH 4, N 2 O, SF 6 include WMO designated institute NOAA/ESRL NMIs act as CCL (O 3, NMHC, Oxy-VOCs, DMS,.. mre in future?) TROPOS in cmparisn with NMIs n Airbrne particle number cncentratin and Airbrne particle charge cncentratin 5
6 BIPM/NMIs are partners in GAW QA/QC system The principles f the GAW QA system Infrmatin sharing n vcabulary and cncepts in metrlgy (traceability, surces f uncertainties, ) Invitatin f CCL in internatinal cmparisns t help demnstrating quality and stability CCLs in sme metrlgy institutes WMO representatives invited t metrlgy cmmunity meetings (Cnsultative Cmmittees in Chemistry and in Radimetry) 6
7 Grund level zne The WCC (EMPA) is a regular participant f BIPM.QM-K1 cmparisn calibratin Natinal standard Reference Instrument (BIPM- SRP27) WMO/GAW Wrld Calibratin Centre (EMPA) Reginal netwrks calibratin centre Lcal statins WMO/GAW statins Reginal statins + Cntributin t Guidelines fr Cntinuus Measurements f Ozne in the Trpsphere (GAW reprt 209) 7
8 Greenhuse Gases CH 4 : CCL (NOAA/ESRL) participant f key cmparisns in 2003 and 2013 u(x) > u(x scale ) Change f scale in between the tw cmparisns 8
9 Greenhuse Gases CO 2 : CCL (NOAA/ESRL) participant in 2003 and 2016 N 2 O : CCL (NOAA/ESRL) participant in 2008 and Effrts t reduce uncertainties f the standards t reach negligible cntributins t the final measurement uncertainty / Data Quality Objective 9
10 Reactive Gases VOCs : NMIs tk respnsibility fr sme f the CCLs + demnstratin f equivalence in cmparisns CCQM-K121 Terpenes in air (pilt NIST) CCQM-K90 Frmaldehyde in nitrgen (pilt BIPM) future cmparisns n BTEX & DMS Schultz MG, Akimt H, Bttenheim J, Buchmann B, Galbally IE, Gilge S, et al.. The Glbal Atmsphere Watch reactive gases measurement netwrk. Elem Sci Anth. 2015;3:67. DOI: 10
11 Aersls Wrking n SI traceability Future key cmparisn (CCQM-K150) n Airbrne particle number cncentratin and Airbrne particle charge cncentratin hsted by TROPOS. 11
12 Cnclusins Usage f GAW prducts & services? Nt really. Partners fr GAW QA/QC. Value derived frm GAW data & services? Awarness f BIPM member states that measurements fr atmspheric mnitring are challenging. What shuld GAW d? Increased patnership within Memrandum f Understanding: Mre inclusin f metrlgy cncepts in measurement guidelines Designatin f additinal CCL and/r WCC in the CIPM-MRA when services cvered (particulates, NOx, ) 12
13 Acknwledgements Thank yu The metrlgy cmmunity! The CCQM / Gas Analysis Wrking Grup
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