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| Titel |
Radio occultation bending angle anomalies during tropical cyclones |
| VerfasserIn |
R. Biondi, T. Neubert, S. Syndergaard, J. K. Nielsen |
| 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. 6 ; Nr. 4, no. 6 (2011-06-15), S.1053-1060 |
| Datensatznummer |
250002008
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| Publikation (Nr.) |
 copernicus.org/amt-4-1053-2011.pdf |
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| Zusammenfassung |
| The tropical deep convection affects the radiation balance of the atmosphere
changing the water vapor mixing ratio and the temperature of the upper
troposphere lower stratosphere. The aim of this work is to better understand
these processes and to investigate if severe storms leave a significant
signature in radio occultation profiles in the tropical tropopause layer.
Using tropical cyclone best track database and data from different GPS radio
occultation missions (COSMIC, GRACE, CHAMP, SACC and GPSMET), we selected
1194 profiles in a time window of 3 h and a space window of 300 km from
the eye of the cyclone. We show that the bending angle anomaly of a GPS
radio occultation signal is typically larger than the climatology in the
upper troposphere and lower stratosphere and that a double tropopause during
deep convection can easily be detected using this technique. Comparisons
with co-located radiosondes, climatology of tropopause altitudes and GOES
analyses are also shown to support the hypothesis that the bending angle
anomaly can be used as an indicator of convective towers. The results are
discussed in connection to the GPS radio occultation receiver which will be
part of the Atomic Clock Ensemble in Space (ACES) payload on the
International Space Station. |
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