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Global distributions of HO2NO2 as observed by MIPAS

Gabriele P. Stiller(1), Thomas von Clarmann(2), Herbert Fischer(2), Bernd Funke(3), Gizaw Mengistu Tsidu(2,4), Norbert Glatthor(2), Udo Grabowski(2), Michael Höpfner(2), Sylvia Kellmann(2), Michael Kiefer(2), Andrea Linden(2), Mathias Milz(2), Tilman Steck(2), Ding-Yi Yang(2,6), Manuel López-Puertas(3) and J. Steinwagner(5)

(1) Forschungszentrum / University Karlsruhe, P.O. Box 3640, 76021 Karlsruhe, Germany
(2) Forschungszentrum / University Karlsruhe, P.O. Box 3640, 76021 Karlsruhe, Germany
(3) Instituto de Astrofísica de Andalucía, Apartado Postal 3004, 18080 Granada, Spain
(4) University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany
(5) Max-Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg, Germany
(6) SAIC/GSO, 7501 Forbes Blvd, Seabrook, Maryland 20706, United States

Abstract

HO2NO2 is a minor constituent of the stratosphere with a concentration of about an order of magnitude smaller than other compounds of the NOy family. Nevertheless, it is important for the understanding the polar stratospheric ozone depletion as it couples the NOx and HOx catalytic cycles of ozone destruction. Its stratospheric and upper tropospheric distributions have be retrieved from limb infrared spectral measurements of MIPAS on board of ENVISAT from the Q branch of the nu6 band at 802.7 cm-1 by constrained multi-parameter non-linear least squares fitting. A single profile precision in the order of 6 to 20 pptv in the altitude range 6 to 17 km, and 15.0 to 34 pptv in the altitude range 20 to 34 km was achieved. The vertical resolution of the retrievals is 5 km in the altitude range of the upper tropospheric and stratospheric maxima. The mean global distributions at equinox conditions have their maxima in terms of volume mixing ratios (vmr) in the subtropics to mid-latitudes at about 28 km with values up to 200 pptv, with a nearly perfect symmetry for the two hemispheres, while mean vmrs reach 80 pptv over the spring pole at 25 km and 50 pptv over the autumn pole at 22 km altitude. At solstice conditions (December and July) the maxima are shifted towards the summer pole reaching 215 pptv in December in Southern midlatitudes at 27 km at night, while day-time values over the summer pole reach 125 pptv at 22 km, and maximum night-time values over the winter pole are as low as 30 pptv at 27 km. In June, the Northern midlatitude night-time maximum even is as high as 225 pptv, while summer pole day-time volume mixing ratios are about 135 pptv. A second maximum in the upper troposphere and lower stratosphere appears from spring to the end of summer with maximum values of 50 pptv between 7 and 11 km, which, however, is more pronounced in the Northern hemisphere. Absolute day-time/night-time differences are most pronounced in December near 60oN, with night-time vmrs being up to 70 pptv higher than day time values. A quantitative comparison with published balloon-borne HO2NO2 measurements has been performed showing good consistency.

The IMK/IAA MIPAS-ENVISAT TEAM is: T. von Clarmann (1), H. Fischer (1), B. Funke (2), Gizaw Mengistu Tsidu (1,3), N. Glatthor (1), U. Grabowski (1), M. Höpfner (1), S. Kellmann (1), M. Kiefer (1), A. Linden (1), M. López-Puertas (2), M. Milz (1), T. Steck (1), G.P. Stiller (1)

(1) Forschungszentrum Karlsruhe/University of Karlsruhe, Institut fuer Meteorologie und Klimaforschung, Karlsruhe, Germany; (2) Instituto de Astrofisica de Andalucia, CSIC, Granada, Spain; (3) now with: Institute of Environmental Physics, University of Bremen, Bremen, Germany

 

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