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| Titel |
Towards the improvement of cloud microphysical retrievals using simultaneous Doppler and polarimetric radar measurements |
| VerfasserIn |
Y. Dufournet, H. W. J. Russchenberg |
| 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 ; 4, no. 10 ; Nr. 4, no. 10 (2011-10-14), S.2163-2178 |
| Datensatznummer |
250002116
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| Publikation (Nr.) |
 copernicus.org/amt-4-2163-2011.pdf |
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| Zusammenfassung |
Radar-based retrievals are often employed to characterize the microphysical
properties of cloud hydrometeors, i.e. their phases, habits, densities as
well as their respective size and orientation distributions. These
techniques are based on a synergetic use of different cloud observation
sensor(s) and microphysical model(s) where the information extracted from
both sensors and models is combined and converted into microphysical cloud
properties. However, the amount of available information is often limited,
which forces current microphysical retrieval techniques to base their
algorithms on several microphysical assumptions which affect the
retrieval accuracy.
By simultaneously combining Doppler and polarimetric measurements obtained
from fully Doppler polarimetric radars, it is possible to create spectral
polarimetric parameters. Although these parameters are easily contaminated
with unwanted echoes, this work shows that, from a correct radar signal
processing based on filtering and averaging techniques, spectral
polarimetric parameters can be correlated to microphysical cloud properties.
In particular, preliminary results suggest that particle orientations and
habits can be determined from the sole use of such spectral polarimetric
parameters. Therefore, such additional spectral polarimetric information
offers an opportunity to improve current microphysical retrievals by
reducing the number of microphysical assumptions in them. |
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