Simultaneous measurements of OClO and NO2 by night above Kiruna

Details Simultaneous measurements of OClO and NO2 by night above Kiruna Simultaneous measurements of OClO and NO2 by night above Kiruna

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....5177p&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #5177

Computer Science

Scientific paper

Simultaneous measurements of OClO and NO2 profiles by night above Kiruna have been made during the last 3 years by the SALOMON remote sensing instruments. This instrument ia a UV-visible spectrometer which is operating by lunar occultation method. OClO is formed at sunset by one of the three channel of the reaction BrO + ClO. In the lower stratosphere, model calculations show that the formation of OClO in relatively large amount is possible only if NO2 mixing ratio is lower than a few tens of pptv at sunset. If NO2 mixing ratio is higher the reaction BrO + NO2 reduces BrO too much before OClO is formed. If we assume the known photochemistry a close relationship between OClO and NO2 must therefore exist by night. OClO and NO2 profiles retrieved by inversion of the measured slant columns by SALOMON compared with model calculations by the lagrangian model MiPLaSMO and the 3D CTM REPROBUS show that this relationship could not be observed in winter at high latitude in the vortex and at the edge of the vortex. Relatively large amount of OClO are indeed retrieved in the lower stratosphere when relatively large amount of NO2 are also retrieved. It has been argued that this disagreement could be only apparent, since these relatively large amount of both OClO and NO2 could be in the same slant column but not at the same altitude as it is retrieved from the inversion. Such bias in the inversion procedure could be indeed possible if the species concentrations are not horizontally homogeneous. To check such an hypothesis we have computed the slant columns in using output of the 3D CTM Reprobus up to 60 km in the conditions of 4 flights of the SALOMON instrument in January 2000, February 2000, December 2000 and January 2002. In the four cases, desagreements are also observed between measured and computed slant columns. We show that this means that OClO and NO2 are really both in a relative large amount, at least, in the same altitude range.

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