Drift-corrected trends and periodic variations in MIPAS IMK/IAA ozone measurements

Author:

Eckert E.ORCID,von Clarmann T.,Kiefer M.,Stiller G. P.ORCID,Lossow S.ORCID,Glatthor N.,Degenstein D. A.,Froidevaux L.,Godin-Beekmann S.,Leblanc T.,McDermid S.,Pastel M.,Steinbrecht W.ORCID,Swart D. P. J.,Walker K. A.ORCID,Bernath P. F.

Abstract

Abstract. Drifts, trends and periodic variations were calculated from monthly zonally averaged ozone profiles. The ozone profiles, among many other species, were derived from level-1b data of the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) by means of the scientific level-2 processor run by Karlsruhe Institute of Technology (KIT), Institute for Meteorlogy and Climate Research (IMK). All trend and drift analyses were performed using a multilinear parametric trend model which includes a linear term, several harmonics with period lengths from three to twenty four months and the quasi-biennial oscillation (QBO). Drifts at 2-sigma significance level were mainly negative for ozone relative to Aura MLS and Odin OSIRIS and negative or near zero for most of the comparisons to Lidar measurements. Lidar stations used here include those at Hohenpeissenberg (47.8° N, 11.0° E), Lauder (45.0° S, 169.7° E), Mauna Loa (19.5° N, 155.6° W), Observatoire Haute Provence (43.9° N, 5.7° E) and Table Mountain (34.4° N, 117.7° W). Drifts against ACE-FTS were found to be mostly insignificant. The assessed MIPAS ozone trends cover the time period of July 2002 to April 2012 and range from -0.5 ppmv decade-1 to +0.5 ppmv decade-1 depending on altitude and latitude. From the drift analyses we derive that the real ozone trends might be slighly more positive/less negative than those calculated from the MIPAS data, by conceding the possibility of MIPAS having a very small (approx. within -0.3 ppmv decade-1) negative drift for ozone. This leads to drift-corrected trends of -0.4 ppmv decade-1 to +0.55 ppmv decade-1 for the time period covered by MIPAS Envisat measurements with very few negative and large areas of positive trends, which is in good agreement with recent literature. Differences of the trends compared with recent literature could be explained by a possible shift of the subtropical mixing barriers. Results for the altitude-latitude distribution of amplitudes of the quasi-biennial, annual and the semi-annual oscillation are also in very good agreement with recent findings.

Publisher

Copernicus GmbH

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