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MIPAS HOCl measurements

Thomas von Clarmann(1), Norbert Glatthor(1), Bernd Funke(2), Udo Grabowski(1), Michael Hoepfner(1), Sylvia Kellmann(1), Michael Kiefer(1), Wolfgang Kouker(1), Andrea Linden(1), Manuel Lopez-Puertas(2), Mathias Milz(1), Thomas Reddmann(1), Roland Ruhnke(1), Tilman Steck(1), Gabriele Stiller(1) and Herbert Fischer(1)

(1) Forschungszentrum Karlsruhe / Universitaet Karlsruhe, POB 3640, 76021 Karlsruhe, Germany
(2) IAA, Apartado Postal 3004, 18080 Granada, Spain

Abstract

From atmospheric signatures at 1215.725 to 1275.550 wavenumbers HOCl volume mixing ratios (VMR) are retrieved at a precision of 25% of the peak volume mixing ratio at an altitude resolution of about 9 km. In general, the expected diurnal changes and latitudinal distribution are found. Beyond this, HOCl formation immediately after the solar proton event 2004 provided evidence of accelerated HOx chemistry, as well as perturbed chlorine chemistry. Measurements in the Southern polar vortex 2002 indicate heterogeneous HOCl formation in the lower stratosphere and a large increase of HOCl VMRs in the upper stratosphere when the vortex air was moved towards lower latitudes during the split vortex event.

 

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry