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| Titel |
Evaluation of gridded scanning ARM cloud radar reflectivity observations and vertical doppler velocity retrievals |
| VerfasserIn |
K. Lamer, A. Tatarevic, I. Jo, P. Kollias |
| 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 ; 7, no. 4 ; Nr. 7, no. 4 (2014-04-29), S.1089-1103 |
| Datensatznummer |
250115703
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| Publikation (Nr.) |
 copernicus.org/amt-7-1089-2014.pdf |
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| Zusammenfassung |
| The scanning Atmospheric Radiation Measurement (ARM) cloud radars (SACRs)
provide continuous atmospheric observations aspiring to capture the 3-D
cloud-scale structure. Sampling clouds in 3-D is challenging due to their
temporal–spatial scales, the need to sample the sky at high elevations and
cloud radar limitations. Thus, a suggested scan strategy is to repetitively
slice the atmosphere from horizon to horizon as clouds advect over the radar
(Cross-Wind Range-Height Indicator – CW-RHI). Here, the processing and
gridding of the SACR CW-RHI scans are presented. First, the SACR sample
observations from the ARM Southern Great Plains and Cape Cod sites are
post-processed (detection mask, gaseous attenuation correction, insect
filtering and velocity de-aliasing). The resulting radial Doppler moment
fields are then mapped to Cartesian coordinates with time as one of the
dimensions. Next the Cartesian-gridded Doppler velocity fields are decomposed
into the horizontal wind velocity contribution and the vertical Doppler
velocity component. For validation purposes, all gridded and retrieved fields
are compared to collocated zenith-pointing ARM cloud radar measurements. We
consider that the SACR sensitivity loss with range, the cloud type observed
and the research purpose should be considered in determining the gridded
domain size. Our results also demonstrate that the gridded SACR observations
resolve the main features of low and high stratiform clouds. It is
established that the CW-RHI observations complemented with processing
techniques could lead to robust 3-D cloud dynamical representations up to
25–30 degrees off zenith. The proposed gridded products are expected to
advance our understanding of 3-D cloud morphology, dynamics and anisotropy
and lead to more realistic 3-D radiative transfer calculations. |
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