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    Evaluation of Modeled Stratocumulus-Capped Boundary Layer Turbulence with Shipborne Data

    Source: Journal of the Atmospheric Sciences:;2013:;Volume( 070 ):;issue: 012::page 3895
    Author:
    Yamaguchi, Takanobu
    ,
    Brewer, W. Alan
    ,
    Feingold, Graham
    DOI: 10.1175/JAS-D-13-050.1
    Publisher: American Meteorological Society
    Abstract: umerically modeled turbulence simulated by the Advanced Research Weather Research and Forecasting Model (ARW) is evaluated with turbulence measurements from NOAA?s high-resolution Doppler lidar on the NOAA Research Vessel Ronald H. Brown during the Variability of the American Monsoon Systems (VAMOS) Ocean?Cloud?Atmosphere?Land Study?Regional Experiment (VOCALS-Rex) field program. A nonprecipitating nocturnal marine stratocumulus case is examined, and a nudging technique is applied to allow turbulence to spin up and come into a statistically stationary state with the initial observed cloud field. This ?stationary? state is then used as the initial condition for the subsequent free-running simulation. The comparison shows that the modeled turbulence is consistently weaker than that observed. For the same resolution, the turbulence becomes stronger, especially for the horizontal component, as the length of the horizontal domain increases from 6.4 to 25.6 km. Analysis of the power spectral density shows that, even for the largest domain, the horizontal component of the turbulence is limited by the upper limit of the domain size; supporting evidence from past studies is provided. Results suggest that convergence is expected for (i) energy spectra of turbulence with a sufficiently large domain and (ii) liquid water path with an adequately large domain and fine resolution. Additional tests are performed by changing momentum advection and turning off subgrid-scale diffusion. These exhibit more significant changes in turbulence characteristics compared to the sensitivity to domain size and resolution, suggesting that the model behavior is essentially established by the configuration of the model dynamics and physics and that the simulation only gradually improves when domain size and resolution are increased.
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      Evaluation of Modeled Stratocumulus-Capped Boundary Layer Turbulence with Shipborne Data

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4219476
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    • Journal of the Atmospheric Sciences

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    contributor authorYamaguchi, Takanobu
    contributor authorBrewer, W. Alan
    contributor authorFeingold, Graham
    date accessioned2017-06-09T16:57:11Z
    date available2017-06-09T16:57:11Z
    date copyright2013/12/01
    date issued2013
    identifier issn0022-4928
    identifier otherams-76971.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4219476
    description abstractumerically modeled turbulence simulated by the Advanced Research Weather Research and Forecasting Model (ARW) is evaluated with turbulence measurements from NOAA?s high-resolution Doppler lidar on the NOAA Research Vessel Ronald H. Brown during the Variability of the American Monsoon Systems (VAMOS) Ocean?Cloud?Atmosphere?Land Study?Regional Experiment (VOCALS-Rex) field program. A nonprecipitating nocturnal marine stratocumulus case is examined, and a nudging technique is applied to allow turbulence to spin up and come into a statistically stationary state with the initial observed cloud field. This ?stationary? state is then used as the initial condition for the subsequent free-running simulation. The comparison shows that the modeled turbulence is consistently weaker than that observed. For the same resolution, the turbulence becomes stronger, especially for the horizontal component, as the length of the horizontal domain increases from 6.4 to 25.6 km. Analysis of the power spectral density shows that, even for the largest domain, the horizontal component of the turbulence is limited by the upper limit of the domain size; supporting evidence from past studies is provided. Results suggest that convergence is expected for (i) energy spectra of turbulence with a sufficiently large domain and (ii) liquid water path with an adequately large domain and fine resolution. Additional tests are performed by changing momentum advection and turning off subgrid-scale diffusion. These exhibit more significant changes in turbulence characteristics compared to the sensitivity to domain size and resolution, suggesting that the model behavior is essentially established by the configuration of the model dynamics and physics and that the simulation only gradually improves when domain size and resolution are increased.
    publisherAmerican Meteorological Society
    titleEvaluation of Modeled Stratocumulus-Capped Boundary Layer Turbulence with Shipborne Data
    typeJournal Paper
    journal volume70
    journal issue12
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-13-050.1
    journal fristpage3895
    journal lastpage3919
    treeJournal of the Atmospheric Sciences:;2013:;Volume( 070 ):;issue: 012
    contenttypeFulltext
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    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian
     
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian