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Intercomparison of instruments for tropospheric measurements using differential optical absorption spectroscopy |
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| Authors: | C Camy-Peyret B Bergovist B Galle M Carleer C Clerbaux R Colin C Fayt F Goutail M Nunes-Pinharanda J P Pommereau M Hausmann U Platt I Pundt T Rudolph C Hermans P C Simon A C Vandaele J M C Plane N Smith |
| Institution: | (1) Laboratoire de Physique Moléculaire et Atmosphérique, Université Pierre et Marie Curie, Paris, France;(2) Swedish Environmental Research Institute, Göteborg, Sweden;(3) Laboratoire de Chimie Physique Moléculaire, Université Libre de Bruxelles, Brussels, Belgium;(4) Université de Mons-Hainaut, Mons, Belgium;(5) Service d'Aéronomie du CNRS, Verrières-le-Buisson, France;(6) Institut für Umweltphysik, Universität Heidelberg, Heidelberg, Germany;(7) Institut d'Aéronomie Spatiale de Belgique, Brussels, Belgium;(8) School of Environmental Sciences, University of East Anglia, Norwich, England |
| Abstract: | The results of an intercomparison campaign of eight different long path UV-visible DOAS instruments measuring NO2, O3 and SO2 concentrations in a moderately polluted urban site are presented. For effective optical path lengths of 230 and 780 m the overall spread of these measurements (±1 ) are 5×1010, 6×1010 and 1×1010 molec·cm-3 (2.0, 2.4, and 0.4 ppb) for these molecules respectively when all instruments used a common set of absorption cross sections. The remaining differences are not completely random and the systematic differences are attributed to the different retrieval methods used for each instrument. |
| Keywords: | NO2 O3 SO2 intercomparison differential optical absorption spectroscopy (DOAS) troposphere |
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