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| Titel |
Long-term trends observed in the middle atmosphere temperatures using ground based LIDARs and satellite borne measurements |
| VerfasserIn |
P. Kishore, M. Venkat Ratnam, I. Velicogna, V. Sivakumar, H. Bencherif, B. R. Clemesha, D. M. Simonich, P. P. Batista, G. Beig |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 3 ; Nr. 32, no. 3 (2014-03-31), S.301-317 |
| Datensatznummer |
250121043
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| Publikation (Nr.) |
 copernicus.org/angeo-32-301-2014.pdf |
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| Zusammenfassung |
| Long-term data available from Lidar systems located at three different
locations namely São José dos Campos, Brazil (23.2° S,
45.8° W), Gadanki (13.5° N, 79.2° E) and Reunion (20.8° S,
55.5° E) have been used to investigate the long-term variations like
Annual, Semi-annual, Quasi-biennial, El Nino Southern Oscillation and solar
cycle. These oscillations are also extracted from simultaneous satellite
borne measurements of HALogen Occultation Experiment (HALOE) instrument
onboard UARS and SABER onboard TIMED over these stations making largest time
series covering the entire middle atmosphere. A good agreement is found
between the LIDAR and satellite-derived amplitudes and phases between 30 and
65 km altitude, which suggests that satellite measurements can be used to
investigate the long-term trends globally. Latter measurements are extended
to 80 km in order to further investigate these oscillations. Large
difference in the amplitudes between the eastern pacific and western pacific
is noticed in these oscillations. Changing from cooling trends in the
stratosphere to warming trends in the mesosphere occurs more or less at
altitude around 70 km altitude and this result agrees well with that
observed by satellite measurements reported in the literature. The peak in
the cooling trend does not occur at a fixed altitude in the stratosphere however
maximum warming trend is observed around 75 km at all the stations. The
observed long-term trends including various oscillations are compared with
that reported with various techniques. |
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