Recommendations for the interpretation of "black carbon" measurements

1 Forschungszentrum Julich GmbH, Institut fur Energieund Klimaforschung IEK-8, 52425 Julich, Germany 2 NOAA/ESRL Global Monitoring Division, Boulder, CO 80305, USA 3 Norwegian Institute for Air Research (NILU), N-2027 Kjeller, Norway 4 Laboratoire de Glaciologie et Geophysique de l'Environnement, Universite de Grenoble I CNRS, 38402 Saint Martin d'Heres cedex, France 5 Environment Canada, Processes Research Section, Toronto, ON M3H 5T4, Canada 6 Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland 7 Deutsches Fernerkundungsdatenzentrum, DLR, 82234 Oberpfaffenhofen, Germany 8 Max Planck Institute for Meteorology, Bundesstrasse 53, 20146 Hamburg, Germany 9 Istituto di Metodologie per l'Analisi Ambientale (CNR-IMAA), Potenza, I-85050, Italy 10 National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan 11 Physikalisch-Meteorologisches Observatorium Davos (PMOD/WRC), 7260 Davos, Switzerland 12 Leibniz Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany 13 Chinese Academy of Meteorological Sciences, 46 Zhong-Guan-Cun S. Av., Beijing 100081, China