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Evaluation of Gridded Scanning Arm Cloud Radar Reflectivity Observations and Vertical Doppler Velocity Retrievals : Volume 6, Issue 6 (08/11/2013)

By Lamer, K.

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Book Id: WPLBN0004000014
Format Type: PDF Article :
File Size: Pages 43
Reproduction Date: 2015

Title: Evaluation of Gridded Scanning Arm Cloud Radar Reflectivity Observations and Vertical Doppler Velocity Retrievals : Volume 6, Issue 6 (08/11/2013)  
Author: Lamer, K.
Volume: Vol. 6, Issue 6
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Kollias, P., Tatarevic, A., Jo, I., & Lamer, K. (2013). Evaluation of Gridded Scanning Arm Cloud Radar Reflectivity Observations and Vertical Doppler Velocity Retrievals : Volume 6, Issue 6 (08/11/2013). Retrieved from http://www.ebooklibrary.org/


Description
Description: Department of Atmospheric and Oceanic Sciences McGill University, Montreal, Canada. The Scanning ARM Cloud Radars (SACR's) 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 common scan strategy is to repetitively slice the atmosphere from horizon to horizon as clouds advect over the radar (Cross-Wind Range Height Indicator – CWRHI). Here, the processing and gridding of the SACR CW-RHI scans are presented. First, the SACR sample observations from the ARM Oklahoma (SGP) and Cape-Cod (PVC) sites are post-processed (detection mask, velocity de-aliasing and gaseous attenuation correction). The resulting radial Doppler moment fields are then mapped to Cartesian coordinates with time as one of the dimension. The Cartesian-gridded Doppler velocity fields are next 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 clouds dynamical representations up to 25–30° off zenith. The proposed gridded products are expected to advance our understanding of 3-D cloud morphology, dynamics, anisotropy and lead to more realistic 3-D radiative transfer calculations.

Summary
Evaluation of gridded Scanning ARM Cloud Radar reflectivity observations and vertical Doppler velocity retrievals

Excerpt
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