Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 6 10 2006 10.5194/acp-6-3115-2006 http://www.atmos-chem-phys.net/6/3115/2006/ http://www.atmos-chem-phys.net/6/3115/2006/acp-6-3115-2006.html http://www.atmos-chem-phys.net/6/3115/2006/acp-6-3115-2006.pdf 3115 3129 2006-07-27 Oxalic acid as a heterogeneous ice nucleus in the upper troposphere and its indirect aerosol effect B. Zobrist zobrist@env.ethz.ch C. Marcolli T. Koop B. P. Luo D. M. Murphy U. Lohmann A. A. Zardini U. K. Krieger T. Corti D. J. Cziczo S. Fueglistaler P. K. Hudson D. S. Thomson T. Peter Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland Department of Chemistry, Bielefeld University, Germany Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Colorado, USA Heterogeneous ice freezing points of aqueous solutions containing various immersed solid dicarboxylic acids (oxalic, adipic, succinic, phthalic and fumaric) have been measured with a differential scanning calorimeter. The results show that only the dihydrate of oxalic acid (OAD) acts as a heterogeneous ice nucleus, with an increase in freezing temperature between 2 and 5 K depending on solution composition. In several field campaigns, oxalic acid enriched particles have been detected in the upper troposphere with single particle aerosol mass spectrometry. 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