1Université Paris-Est, CEREA, Research and Teaching Centre in Atmospheric Environment, Joint Laboratory École Nationale des Ponts et Chaussées / EDF R&D, 6–8 avenue Blaise Pascal, 77455 Champs sur Marne, France
2INRIA Paris-Rocquencourt Research Center, France
3Department of Atmospheric Environment, National Environmental Research Institute, Aarhus University, Frederiksborgvej 399, P.O. Box 358, DK-4000 Roskilde, Denmark
*currently at: Laboratoire Jean Kuntzmann, University of Grenoble, BP 53X, 38041 Grenoble cedex, France
Abstract. We give here an account on the results of source inversion of the ETEX-II experiment. Inversion has been performed with the maximum entropy method on the basis of non-zero measurements and in conjunction with a transport model Polair3D. The discrepancy scaling factor between the true and the reconstructed mass has been estimated to be equal to 7. The results contrast with the method's performance on the ETEX-I source. In the latter case its mass has been reconstructed with an accuracy exceeding 80%. The large value of the discrepancy factor for ETEX-II could be ascribed to modelling difficulties, possibly linked not to the transport model itself but rather to the quality of the measurements.