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| Titel |
Ground-based millimeter-wave observation of stratospheric ClO over Atacama, Chile in the mid-latitude Southern Hemisphere |
| VerfasserIn |
T. Kuwahara, T. Nagahama, H. Maezawa, Y. Kojima, H. Yamamoto, T. Okuda, N. Mizuno, H. Nakane, Y. Fukui, A. Mizuno |
| 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 ; 5, no. 11 ; Nr. 5, no. 11 (2012-11-01), S.2601-2611 |
| Datensatznummer |
250003161
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| Publikation (Nr.) |
 copernicus.org/amt-5-2601-2012.pdf |
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| Zusammenfassung |
| We have performed ground-based measurements of stratospheric chlorine
monoxide (ClO) during the summer in 2009 over the Atacama highland, Chile, a
new observing site in the mid-latitude region in the Southern Hemisphere, by
using a millimeter-wave spectroscopic radiometer. The radiometer, equipped
with a superconducting receiver and a digital Fourier spectrometer, was
developed by Nagoya University, and the new observing system provides us high
sensitivity and stable performance to measure the very weak ClO lines. The
receiver noise temperature of the superconducting receiver is 170 K in DSB.
To reveal the diurnal variation of ClO, we retrieved the vertical mixing
ratio profiles by the weighted-damped least-squares algorithm applied for the
spectral data at 203 GHz obtained between 5 and 16 December 2009. The total
error on the retrieval is estimated to be 20% to 30% in an altitude
range from 40 km to 50 km. The amplitude of the diurnal variation is
estimated as 33% of the daytime average at 40 km. The observed time
variation shows a pattern similar to that of the previous works observed in
the northern mid-latitude region. |
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