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| Titel |
An investigation of atmospheric temperature profiles in the Australian region using collocated GPS radio occultation and radiosonde data |
| VerfasserIn |
K. Zhang, E. Fu, D. Silcock, Y. Wang, Y. Kuleshov |
| 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 ; 4, no. 10 ; Nr. 4, no. 10 (2011-10-05), S.2087-2092 |
| Datensatznummer |
250002110
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| Publikation (Nr.) |
 copernicus.org/amt-4-2087-2011.pdf |
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| Zusammenfassung |
| GPS radio occultation (RO) has been recognised as an alternative atmospheric
upper air observation technique due to its distinct features and
technological merits. The CHAllenging Minisatellite Payload (CHAMP) RO
satellite and FORMOSAT-3/COSMIC (Constellation Observing System for
Meteorology, Ionosphere and Climate) RO constellation together have provided
about ten years of high quality global coverage RO atmospheric profiles.
This technique is best used for meteorological studies in the
difficult-to-access areas such as deserts and oceans. To better understand
and use RO data, effective quality assessment using independent radiosonde
data and its associated collocation criteria used in tempo-spatial domain
are important. This study compares GPS RO retrieved temperature profiles
from both CHAMP (between May 2001 and October 2008) and FORMOSAT-3/COSMIC
(between July 2006 and December 2009) with radiosonde data from 38
Australian radiosonde stations. The overall results show a good agreement
between the two data sets. Different collocation criteria within 3 h and
300 km between the profile pairs have been applied and the impact of these
different collocation criteria on the evaluation results is found
statistically insignificantly. The CHAMP and FORMOSAT-3/COSMIC temperature
profiles have been evaluated at 16 different pressure levels and the
differences between GPS RO and radiosonde at different levels of the
atmosphere have been studied. The result shows that the mean temperature
difference between radiosonde and CHAMP is 0.39 °C (with a standard
deviation of 1.20 °C) and the one between radiosonde and
FORMOSAT-3/COSMIC is 0.37 °C (with a standard deviation of 1.24 °C).
Different collocation criteria have been applied and insignificant
differences were identified amongst the results. |
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