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| Titel |
Performance assessment of a triple-frequency spaceborne cloud–precipitation radar concept using a global cloud-resolving model |
| VerfasserIn |
J. Leinonen, M. D. Lebsock, S. Tanelli, K. Suzuki, H. Yashiro, Y. Miyamoto |
| 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 ; 8, no. 8 ; Nr. 8, no. 8 (2015-08-26), S.3493-3517 |
| Datensatznummer |
250116545
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| Publikation (Nr.) |
 copernicus.org/amt-8-3493-2015.pdf |
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| Zusammenfassung |
| Multi-frequency radars offer enhanced detection of clouds and precipitation
compared to single-frequency systems, and are able to make more accurate
retrievals when several frequencies are available simultaneously. An
evaluation of a spaceborne three-frequency Ku-/Ka-/W-band radar system is
presented in this study, based on modeling radar reflectivities from the
results of a global cloud-resolving model with a 875 m grid spacing.
To produce the reflectivities, a scattering model has been developed for each
of the hydrometeor types produced by the model, as well as for melting snow.
The effects of attenuation and multiple scattering on the radar signal are
modeled using a radiative transfer model, while nonuniform beam filling is
reproduced with spatial averaging. The combined effects of these are then
quantified both globally and in six localized case studies. Two different
orbital scenarios using the same radar are compared. Overall, based on the
results, it is expected that the proposed radar would detect a high-quality
signal in most clouds and precipitation. The main exceptions are the thinnest
clouds that are below the detection threshold of the W-band channel, and at
the opposite end of the scale, heavy convective rainfall where a combination
of attenuation, multiple scattering and nonuniform beam filling commonly
cause significant deterioration of the signal; thus, while the latter can be
generally detected, the quality of the retrievals is likely to be degraded. |
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