1. Meteorology and Air Quality; Wageningen University; Wageningen Netherlands
2. Institute for Marine and Atmospheric Research Utrecht; Utrecht University; Utrecht Netherlands
3. SRON Netherlands Institute for Space Research; Utrecht Netherlands
4. Instituto de Pesquisas Energéticas e Nucleares (IPEN); Centro de Química Ambiental; São Paulo Brazil
5. Global Monitoring Division, Earth System Research Laboratory; National Oceanic and Atmospheric Administration (NOAA); Boulder Colorado USA
6. Cooperative Institute for Research in Environmental Sciences (CIRES); University of Colorado; Boulder Colorado USA
7. School of Geography; University of Leeds; Leeds UK
8. Faculty of Earth and Life Sciences; VU University Amsterdam; Amsterdam Netherlands
9. Max Planck Institute for Chemistry; Mainz Germany
10. National Center for Atmospheric Research (NCAR); Boulder Colorado USA
11. LATMOS-IPSL; UPMC University Paris 06, Université de Versailles Saint-Quentin-en-Yvelines, CNRS/INSU; Paris France
12. Centre for Isotope Research; University of Groningen; Groningen Netherlands