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| Titel |
Development and testing of the Active Temperature, Ozone and Moisture Microwave Spectrometer (ATOMMS) cm and mm wavelength occultation instrument |
| VerfasserIn |
E. R. Kursinski, D. Ward, M. Stovern, A. C. Otarola, A. Young, B. Wheelwright, R. Stickney, S. Albanna, B. Duffy, C. Groppi, J. Hainsworth |
| 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. 2 ; Nr. 5, no. 2 (2012-02-27), S.439-456 |
| Datensatznummer |
250002469
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| Publikation (Nr.) |
 copernicus.org/amt-5-439-2012.pdf |
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| Zusammenfassung |
We present initial results from testing a new remote sensing system called
the Active Temperature, Ozone and Moisture Microwave Spectrometer (ATOMMS).
ATOMMS is designed as a satellite-to-satellite occultation system for
monitoring climate. We are developing the prototype instrument for an
aircraft to aircraft occultation demonstration. Here we focus on field
testing of the ATOMMS instrument, in particular the remote sensing of water
by measuring the attenuation caused by the 22 GHz and 183 GHz water absorption
lines.
Our measurements of the 183 GHz line spectrum along an 820 m path revealed
that the AM 6.2 spectroscopic model provdes a much better match to the
observed spectrum than the MPM93 model. These comparisons also indicate that
errors in the ATOMMS amplitude measurements are about 0.3%. Pressure
sensitivity bodes well for ATOMMS as a climate instrument. Comparisons with a
hygrometer revealed consistency at the 0.05 mb level, which is about 1%
of the absolute humidity.
Initial measurements of absorption by the 22 GHz line made along a 5.4 km
path between two mountaintops captured a large increase in water vapor
similar to that measured by several nearby hygrometers. A storm passage
between the two instruments yielded our first measurements of extinction by
rain and cloud droplets. Comparisons of ATOMMS 1.5 mm opacity measurements
with measured visible opacity and backscatter from a weather radar revealed
features simultaneously evident in all three datasets confirming the ATOMMS
measurements. The combined ATOMMS, radar and visible information revealed the
evolution of rain and cloud amounts along the signal path during the passage
of the storm. The derived average cloud water content reached typical
continental cloud amounts. These results demonstrated a significant portion
of the information content of ATOMMS and its ability to penetrate through
clouds and rain which is critical to its all-weather, climate monitoring
capability. |
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