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| Titel |
Technical Note: Measurement of the tropical UTLS composition in presence of clouds using millimetre-wave heterodyne spectroscopy |
| VerfasserIn |
B. M. Dinelli, E. Castelli, B. Carli, S. Bianco, M. Gai, L. Santurri, B. P. Moyna, M. Oldfield, R. Siddans, D. Gerber, W. J. Reburn, B. J. Kerridge, C. Keim |
| 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 ; 9, no. 4 ; Nr. 9, no. 4 (2009-02-17), S.1191-1207 |
| Datensatznummer |
250006920
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| Publikation (Nr.) |
 copernicus.org/acp-9-1191-2009.pdf |
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| Zusammenfassung |
| The MARSCHALS (Millimetre-wave Airborne Receiver for Spectroscopic
CHaracterisation of Atmospheric Limb-Sounding) project has the general
objectives of demonstrating the measurement capabilities of a limb viewing
instrument working in the millimetre and sub-millimetre spectral regions
(from 294 to 349 GHz) for the study of the Upper Troposphere – Lower
Stratosphere (UTLS). MARSCHALS has flown on board the M-55 stratospheric
aircraft (Geophysica) in two measurements campaigns. Here we report the
results of the analysis of MARSCHALS measurements during the SCOUT-O3
campaign held in Darwin (Australia) in December 2005 obtained with MARC
(Millimetre-wave Atmospheric-Retrieval Code). MARSCHALS measured vertical
distributions of temperature, water vapour, ozone and nitric acid in the
altitude range from 10 to 20 km in presence of clouds that obscure
measurements in the middle infrared spectroscopic region. The minimum
altitude at which the retrieval has been possible is determined by the high
water concentration typical of the tropical region rather than the extensive
cloud coverage experienced during the flight. Water has been measured from
10 km to flight altitude (~18 km) with a 10% accuracy, ozone from
14 km to flight altitude with accuracy ranging from 10% to 60%, while
the retrieval of nitric acid has been possible with an accuracy not better
than 40% only from 16 km to flight altitude due to the low signal to
noise ratio of its emission in the analysed spectral region. The results
have been validated using measurement made in a less cloudy region by
MIPAS-STR, an infrared limb-viewing instrument on board the M-55, during the
same flight. |
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