Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 4 2009 10.5194/acp-9-1191-2009 http://www.atmos-chem-phys.net/9/1191/2009/ http://www.atmos-chem-phys.net/9/1191/2009/acp-9-1191-2009.html http://www.atmos-chem-phys.net/9/1191/2009/acp-9-1191-2009.pdf 1191 1207 2009-02-17 Technical Note: Measurement of the tropical UTLS composition in presence of clouds using millimetre-wave heterodyne spectroscopy B. M. Dinelli BM.Dinelli@isac.cnr.it E. Castelli B. Carli S. Del Bianco M. Gai L. Santurri B. P. Moyna M. Oldfield R. Siddans D. Gerber W. J. Reburn B. J. Kerridge C. Keim Istituto di Scienze dell'Atmosfera e del Clima – CNR, Bologna, Italy Istituto di Fisica Applicata "N. Carrara" – CNR, Florence, Italy "Millimetre-wave Technology Group" RAL, UK "Remote Sensing Group" RAL, UK Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, Germany now at: Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA) CNRS/ Univ. Paris 12 et 7, France The MARSCHALS (Millimetre-wave Airborne Receiver for Spectroscopic CHaracterisation of Atmospheric Limb-Sounding) project has the general objectives of demonstrating the measurement capabilities of a limb viewing instrument working in the millimetre and sub-millimetre spectral regions (from 294 to 349 GHz) for the study of the Upper Troposphere – Lower Stratosphere (UTLS). MARSCHALS has flown on board the M-55 stratospheric aircraft (Geophysica) in two measurements campaigns. Here we report the results of the analysis of MARSCHALS measurements during the SCOUT-O3 campaign held in Darwin (Australia) in December 2005 obtained with MARC (Millimetre-wave Atmospheric-Retrieval Code). MARSCHALS measured vertical distributions of temperature, water vapour, ozone and nitric acid in the altitude range from 10 to 20 km in presence of clouds that obscure measurements in the middle infrared spectroscopic region. 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