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| Titel |
Stability of temperatures from TIMED/SABER v1.07 (2002–2009) and Aura/MLS v2.2 (2004–2009) compared with OH(6-2) temperatures observed at Davis Station, Antarctica |
| VerfasserIn |
W. J. R. French, F. J. Mulligan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 23 ; Nr. 10, no. 23 (2010-12-03), S.11439-11446 |
| Datensatznummer |
250008931
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| Publikation (Nr.) |
 copernicus.org/acp-10-11439-2010.pdf |
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| Zusammenfassung |
| Temperature profiles from two satellite instruments – TIMED/SABER and
Aura/MLS – have been used to calculate hydroxyl-layer equivalent
temperatures for comparison with values measured from OH(6-2) emission lines
observed by a ground-based spectrometer located at Davis Station, Antarctica
(68° S, 78° E). The profile selection criteria – miss-distance
<500 km from the ground station and solar zenith angles >97° –
yielded a total of 2359 SABER profiles over 8 years (2002–2009) and 7407 MLS
profiles over 5.5 years (2004–2009). The availability of simultaneous OH
volume emission rate (VER) profiles from the SABER (OH-B channel) enabled an
assessment of the impact of several different weighting functions in the
calculation of OH-equivalent temperatures. The maximum difference between
all derived hydroxyl layer equivalent temperatures was less than 3 K.
Restricting the miss-distance and miss-time criteria showed little effect on
the bias, suggesting that the OH layer is relatively uniform over the
spatial and temporal scales considered. However, a significant trend was
found in the bias between SABER and Davis OH of ~0.7 K/year over the
8-year period with SABER becoming warmer compared with the Davis OH
temperatures. In contrast, Aura/MLS exhibited a cold bias of 9.9 ± 0.4 K
compared with Davis OH, but importantly, the bias remained constant over the
2004–2009 year period examined. The difference in bias behaviour of the two
satellites has significant implications for multi-annual and long-term
studies using their data. |
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