International comparison CCQM-P41 Greenhouse gases. 1. Measurement Capability Final Report Adriaan M.H. van der Veen 1 , Freek N.C. Brinkmann 1 , Mile Arnautovic 2 , Laurie Besley 2 , Hans-Joachim Heine 3 , Teresa Lopez Esteban 4 , Michela Sega 5 , Kenji Kato 6 , Jin Seog Kim 7 , Alejandro Perez Castorena 8 , Agata Rakowska 9 , Martin J.T. Milton 10 , Frank R. Guenther 11 , R. Francey 12 , E. Dlugokencky 13 1 NMi Van Swinden Laboratorium B.V. (NMi VSL), Thijsseweg 11, 2629 JA Delft, the Nether- lands 2 National Measurement Institute, Australia (NMIA), Bradfield Road, West Lindfield, Lind- field, NSW 2070, Australia 3 Bundesanstalt für Materialforschung und –prüfung (BAM), Abteilung I, Unter den Eichen 87, D-12205 Berlin, Germany 4 Centro Espanol de Metrologia (CEM), C/ del Alfar, 2, 28760 Tres Cantos (Madrid), Spain 5 Istituto di Metrologia "G. Colonnetti"(IMGC), Strada delle Cacce 73, I-10135 Torino, Italy 6 National Metrology Institute of Japan (NMIJ), 305-8565 Umezono 1-1-1, Tsukuba Ibaraki, Japan 7 Korea Research Institute of Standards and Science (KRISS), Division of Chemical Metrol- ogy and Materials Evaluation, P.O.Box 102, Yusong, Taejon, Republic of Korea 8 CENAM, Km. 4,5 Carretera a los Cues, Municipio del Marques C.P. 76900, Queretaro, Mexico 9 Central Office of Measures, Physical Chemistry Division (GUM), 2 Elektoralna St., 00-950 Warsaw, Poland 10 National Physical Laboratory (NPL), Teddington, Middlesex, TW11 0LW, UK 11 Nat ional Inst it ut e of St andards and Technology (NIST), Chemical Science and Technology Laboratory, 100 Bureau Drive, Gaithersburg MD, USA 12 CSIRO At mospheric Research (CSIRO-AR), 107-121 St at ion St reet , Aspendale VIC 3195, Australia 13 NOAA R/ CMDL1 (NOAA), 325 Broadway, Boulder CO, USA Field Amount-of-substance Subject Greenhouse gases (methane and carbon dioxide in air) Participants NMIA 1 (AU), BAM (DE), CEM (ES), IMGC (IT), NMIJ (JP), KRISS (KR), CENAM (MX), NMi VSL (NL), GUM (PO), NPL (UK), NIST (US) Laboratories of the WMO 2 : CSIRO-AR (AU), NOAA (US) 1 At the time of participation, NMIA was known as CSIRO-National Metrology Laboratory 2 WMO = World Meteorological Organisation of