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| Titel |
Assessment of GPS radiosonde descent data |
| VerfasserIn |
M. Venkat Ratnam, N. Pravallika, S. Ravindra Babu, G. Basha, M. Pramitha, B. V. Krishna Murthy |
| 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. 4 ; Nr. 7, no. 4 (2014-04-16), S.1011-1025 |
| Datensatznummer |
250115697
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| Publikation (Nr.) |
 copernicus.org/amt-7-1011-2014.pdf |
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| Zusammenfassung |
| Radiosondes are widely used to obtain basic meteorological parameters such
as pressure (P), temperature (T), relative humidity (RH) and horizontal
winds during the balloon ascent up to the altitude of balloon burst, usually
~ 32–35 km. Data from the radiosondes released from Gadanki
(13.5° N, 79.2° E), a tropical station in India, have been collected
during the ascent and during the descent as well without attaching any
parachute or its equivalent since the year 2008. In the present study an
attempt has been made to characterize the radiosonde descent data with the
main objective of exploring its usefulness and reliability for scientific
purposes. We compared the data obtained during ascent and descent phases of
the same sounding. The mean differences in T, RH and horizontal winds
between ascent and descent data are found to be small and are sometimes even
within the uncertainty of the measurements and/or expected diurnal variation
itself. The very good consistency observed between the ascent and the
descent data shows that one more profile of the meteorological parameters
can be constructed within 3 h of time of balloon launch practically at no
additional cost. Further checks are done by utilizing the 3-hourly
radiosonde observations collected during the Tropical Tropopause Dynamics
campaigns conducted at Gadanki. In the process of checking the consistency
between the radiosonde ascent and descent data, several new findings are
arrived at and are reported in this study. In general, it has taken more
than half an hour for the balloon to reach the ground from the burst
altitude. It is also observed that the fall velocity is close to 10 m s−1 near
the surface. Finally, it is suggested to record the observations also when
the balloon is descending as this information is useful for scientific
purposes. |
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