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| Titel |
Drift-corrected Trends and Periodic Variations in MIPAS IMK/IAA Ozone Measurements |
| VerfasserIn |
Ellen Eckert, Thomas von Clarmann, Gabriele Stiller, Stefan Lossow, Michael Kiefer, Doug Degenstein, Lucien Froidevaux, Wolfgang Steinbrecht, Kaley Walker, Peter Bernath |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250086244
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| Publikation (Nr.) |
 EGU/EGU2014-72.pdf |
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| Zusammenfassung |
| MIPAS was a limb emission mid-infrared spectrometer that was measuring temperature and
atmospheric constituent profiles from June 2002 to April 2012. Drifts, trends and
periodic variations were calculated from monthly zonally averaged ozone profiles. The
ozone profiles, among those of 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 parametric trend model which includes a linear term,
the annual and semi-annual oscillation as well as several subharmonics 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
nonsignificant. Determining these drifts is an important step on the way of providing a
solid basis for the results of the trend analysis. From the drift analyses we derive
that the ozone trends might be slighly more positive/less negative in reality than
those calculated from the MIPAS data, by conceding the possibility of MIPAS
having a very small (approx. within -0.3ppmv/dec) negative drift for ozone. These
findings lead to predominantly near zero or slightly positive ozone trends for the time
period covered by MIPAS Envisat measurements which is in good agreement with
recent literature. Results for the amplitudes of the QBO, AO, and SAO and their
latitude/altitude dependence are also in very good agreement with recent literature. |
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