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| Titel |
Intercomparison of stratospheric gravity wave observations with AIRS and IASI |
| VerfasserIn |
L. Hoffmann, M. J. Alexander, C. Clerbaux, A. W. Grimsdell, C. I. Meyer, T. Rößler, B. Tournier |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 12 ; Nr. 7, no. 12 (2014-12-18), S.4517-4537 |
| Datensatznummer |
250116000
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| Publikation (Nr.) |
 copernicus.org/amt-7-4517-2014.pdf |
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| Zusammenfassung |
| Gravity waves are an important driver for the atmospheric
circulation and have substantial impact on weather and climate.
Satellite instruments offer excellent opportunities to study gravity
waves on a global scale. This study focuses on observations from
the Atmospheric Infrared Sounder (AIRS) onboard the National
Aeronautics and Space Administration Aqua satellite and the
Infrared Atmospheric Sounding Interferometer (IASI) onboard the
European MetOp satellites. The main aim of this study is an
intercomparison of stratospheric gravity wave observations of both
instruments. In particular, we analyzed AIRS and IASI 4.3 μm
brightness temperature measurements, which directly relate to
stratospheric temperature. Three case studies showed that AIRS and
IASI provide a clear and consistent picture of the temporal
development of individual gravity wave events. Statistical
comparisons based on a 5-year period of measurements
(2008–2012) showed similar spatial and temporal patterns of
gravity wave activity. However, the statistical comparisons also
revealed systematic differences of variances between AIRS and IASI
that we attribute to the different spatial measurement
characteristics of both instruments. We also found differences
between day- and nighttime data that are partly due to the local
time variations of the gravity wave sources. While AIRS has been
used successfully in many previous gravity wave studies, IASI data
are applied here for the first time for that purpose. Our study
shows that gravity wave observations from different hyperspectral
infrared sounders such as AIRS and IASI can be directly related to
each other, if instrument-specific characteristics such as different
noise levels and spatial resolution and sampling are carefully
considered. The ability to combine observations from different
satellites provides an opportunity to create a long-term record,
which is an exciting prospect for future climatological studies of
stratospheric gravity wave activity. |
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