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| Titel |
Validation of FORMOSAT-3/COSMIC level 2 "atmPrf" global temperature data in the stratosphere |
| VerfasserIn |
U. Das, C. J. Pan |
| 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. 3 ; Nr. 7, no. 3 (2014-03-12), S.731-742 |
| Datensatznummer |
250115644
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| Publikation (Nr.) |
 copernicus.org/amt-7-731-2014.pdf |
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| Zusammenfassung |
| GPS radio occultations by Formosa Satellite mission-3/Constellation Observing
System for Meteorology, Ionosphere, and Climate (FORMOSAT-3/COSMIC) provide
bending angle profiles, which are further processed to give profiles of
temperature and water vapour in the lower atmosphere and electron density in
the upper atmosphere. The level 2 "atmPrf" (atmospheric profile) product of
version 2010.2640 gives temperature from surface to 0.2 hPa
(~ 60 km). This is a dry temperature data product that does not
include relative humidity in the inversion process and hence is reliable at
altitudes < 100 hPa and erroneous at lower altitudes. In the current
study we compare the COSMIC "atmPrf" data from December 2010 to November
2011 with other satellite (SABER/TIMED and MLS/Aura) temperatures from 50 to
0.2 hPa, COSMIC "wetPrf" data and reanalysis (NCEP, ERA-Interim and UKMO)
outputs at 100, 10, 1 and 0.5 hPa pressure levels. The satellite comparisons
show that below 1 hPa the observed median differences are most likely
produced due to the biases in the retrievals of SABER and MLS. "atmPrf" and
"wetPrf" temperatures compare extremely well in the common altitudes with
differences being absolute zero between 200 and 10 hPa. When compared to
reanalysis outputs, COSMIC seasonal means match NCEP and ECMWF seasonal mean
temperatures very well, especially at 100 and 10 hPa. We conclude from this
study that with the COSMIC dry temperature retrievals obtained from radio
occultations of GPS, there is a 20 km extension of reliable data in the
middle atmosphere. "atmPrf" data are of good quality and provide reliable
and unprecedentedly large number of profiles at greater temporal and spatial
resolutions for further studies and investigations of the middle atmosphere
up to 1 hPa, i.e., approximately up to the stratopause at around 50 km. |
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