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    Climatology of High Cloud Dynamics Using Profiling ARM Doppler Radar Observations

    Source: Journal of Climate:;2013:;volume( 026 ):;issue: 017::page 6340
    Author:
    Kalesse, Heike
    ,
    Kollias, Pavlos
    DOI: 10.1175/JCLI-D-12-00695.1
    Publisher: American Meteorological Society
    Abstract: ce cloud properties are influenced by cloud-scale vertical air motion. Dynamical properties of ice clouds can be determined via Doppler measurements from ground-based, profiling cloud radars. Here, the decomposition of the Doppler velocities into reflectivity-weighted particle velocity Vt and vertical air motion w is described. The methodology is applied to high clouds observations from 35-GHz profiling millimeter wavelength radars at the Atmospheric Radiation Measurement Program (ARM) Southern Great Plains (SGP) climate research facility in Oklahoma (January 1997?December 2010) and the ARM Tropical Western Pacific (TWP) site in Manus (July 1999?December 2010). The Doppler velocity measurements are used to detect gravity waves (GW), whose correlation with high cloud macrophysical properties is investigated. Cloud turbulence is studied in the absence and presence of GW. High clouds are less turbulent when GW are observed. Probability density functions of Vt, w, and high cloud macrophysical properties for the two cloud subsets (with and without GW) are presented. Air-density-corrected Vt for high clouds for which GW (no GW) were detected amounted to hourly means and standard deviations of 0.89 ± 0.52 m s?1 (0.8 ± 0.48 m s?1) and 1.03 ± 0.41 m s?1 (0.86 ± 0.49 m s?1) at SGP and Manus, respectively. The error of w at one standard deviation was estimated as 0.15 m s?1. Hourly means of w averaged around 0 m s?1 with standard deviations of ±0.27 (SGP) and ±0.29 m s?1 (Manus) for high clouds without GW and ±0.22 m s?1 (both sites) for high clouds with GW. The midlatitude site showed stronger seasonality in detected high cloud properties.
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      Climatology of High Cloud Dynamics Using Profiling ARM Doppler Radar Observations

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4222630
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    contributor authorKalesse, Heike
    contributor authorKollias, Pavlos
    date accessioned2017-06-09T17:07:44Z
    date available2017-06-09T17:07:44Z
    date copyright2013/09/01
    date issued2013
    identifier issn0894-8755
    identifier otherams-79809.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4222630
    description abstractce cloud properties are influenced by cloud-scale vertical air motion. Dynamical properties of ice clouds can be determined via Doppler measurements from ground-based, profiling cloud radars. Here, the decomposition of the Doppler velocities into reflectivity-weighted particle velocity Vt and vertical air motion w is described. The methodology is applied to high clouds observations from 35-GHz profiling millimeter wavelength radars at the Atmospheric Radiation Measurement Program (ARM) Southern Great Plains (SGP) climate research facility in Oklahoma (January 1997?December 2010) and the ARM Tropical Western Pacific (TWP) site in Manus (July 1999?December 2010). The Doppler velocity measurements are used to detect gravity waves (GW), whose correlation with high cloud macrophysical properties is investigated. Cloud turbulence is studied in the absence and presence of GW. High clouds are less turbulent when GW are observed. Probability density functions of Vt, w, and high cloud macrophysical properties for the two cloud subsets (with and without GW) are presented. Air-density-corrected Vt for high clouds for which GW (no GW) were detected amounted to hourly means and standard deviations of 0.89 ± 0.52 m s?1 (0.8 ± 0.48 m s?1) and 1.03 ± 0.41 m s?1 (0.86 ± 0.49 m s?1) at SGP and Manus, respectively. The error of w at one standard deviation was estimated as 0.15 m s?1. Hourly means of w averaged around 0 m s?1 with standard deviations of ±0.27 (SGP) and ±0.29 m s?1 (Manus) for high clouds without GW and ±0.22 m s?1 (both sites) for high clouds with GW. The midlatitude site showed stronger seasonality in detected high cloud properties.
    publisherAmerican Meteorological Society
    titleClimatology of High Cloud Dynamics Using Profiling ARM Doppler Radar Observations
    typeJournal Paper
    journal volume26
    journal issue17
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-12-00695.1
    journal fristpage6340
    journal lastpage6359
    treeJournal of Climate:;2013:;volume( 026 ):;issue: 017
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian