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| Titel |
Synergetic use of millimeter- and centimeter-wavelength radars for retrievals of cloud and rainfall parameters |
| VerfasserIn |
S. Y. Matrosov |
| 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 ; 10, no. 7 ; Nr. 10, no. 7 (2010-04-07), S.3321-3331 |
| Datensatznummer |
250008332
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| Publikation (Nr.) |
 copernicus.org/acp-10-3321-2010.pdf |
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| Zusammenfassung |
| A remote sensing approach for simultaneous retrievals of cloud and rainfall
parameters in the vertical column above the US Department of Energy's
(DOE) Climate Research Facility at the Tropical Western Pacific (TWP) Darwin
site in Australia is described. This approach uses vertically pointing
measurements from a DOE Ka-band radar and scanning measurements from a
nearby C-band radar pointing toward the TWP Darwin site. Rainfall retrieval
constraints are provided by data from a surface impact disdrometer. The
approach is applicable to stratiform precipitating cloud systems when a
separation between the liquid hydrometeor layer, which contains rainfall and
liquid water clouds, and the ice hydrometeor layer is provided by the radar
bright band. Absolute C-band reflectivities and Ka-band vertical
reflectivity gradients in the liquid layer are used for retrievals of the
mean layer rain rate and cloud liquid water path (CLWP). C-band radar
reflectivities are also used to estimate ice water path (IWP) in regions
above the melting layer. The retrieval uncertainties of CLWP and IWP for
typical stratiform precipitation systems are about 500–800 g m−2 (for
CLWP) and a factor of 2 (for IWP). The CLWP retrieval uncertainties increase
with rain rate, so retrievals for higher rain rates may be impractical. The
expected uncertainties of layer mean rain rate retrievals are around 20%,
which, in part, is due to constraints available from the disdrometer data.
The applicability of the suggested approach is illustrated for two
characteristic events observed at the TWP Darwin site during the wet season
of 2007. A future deployment of W-band radars at the DOE tropical Climate
Research Facilities can improve CLWP estimation accuracies and provide
retrievals for a wider range of stratiform precipitating cloud events. |
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