4-D comparison method to study the NOy partitioning in summer polar stratosphere – Influence of aerosol burden G. Dufour1, S. Payan1, F. Lefèvre2, M. Eremenko1, A. Butz3, P. Jeseck1, Y. Té1, K. Pfeilsticker3, and C. Camy-Peyret1 1Laboratoire de Physique Moléculaire et Applications, Université P. et M. Curie, Paris, France 2Service d’Aéronomie, Institut Pierre-Simon Laplace, Paris, France 3Institut für Umweltphysik, University of Heidelberg, Germany
Abstract. On 21–22 August 2001, NO, NO2 and HNO3 mixing ratio profiles were
measured at high latitudes during sunset and sunrise using the Limb Profile
Monitor of the Atmosphere (LPMA) and the DOAS experiments under
stratospheric balloon. Photochemical simulations using the chemistry module
of the Reprobus Chemistry Transport Model (CTM) that are constrained by
ozone and total NOy balloon observations reproduce well the
partitioning of NOx and NOy when model results are calculated at
the exact time and location of the measurement for each tangent altitude.
Taking the recently recommended reaction rate coefficients for the NOy
partitioning (JPL-2003) and using realistic aerosol surface area in order to
initialise the model leads to an agreement between calculations and
measurements better than 10% all over the covered altitude range.
Citation: Dufour, G., Payan, S., Lefèvre, F., Eremenko, M., Butz, A., Jeseck, P., Té, Y., Pfeilsticker, K., and Camy-Peyret, C.: 4-D comparison method to study the NOy partitioning in summer polar stratosphere – Influence of aerosol burden, Atmos. Chem. Phys., 5, 919-926, doi:10.5194/acp-5-919-2005, 2005.