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    Trapped Lee Waves Observed during PYREX by Constant Volume Balloons: Comparison with Meso-NH Simulations

    Source: Journal of the Atmospheric Sciences:;2000:;Volume( 057 ):;issue: 013::page 2007
    Author:
    Koffi, Ernest N’Dri
    ,
    Georgelin, Marc
    ,
    Benech, Bruno
    ,
    Richard, Evelyne
    DOI: 10.1175/1520-0469(2000)057<2007:TLWODP>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The main objective of the present paper is the use of a constant volume balloon (CVB) as a tool to (i) study trapped lee waves and (ii) assess the forecasting capability of a nonhydrostatic numerical model. Then, CVB data obtained during the Pyrénées Experiment (PYREX) are compared with nonhydrostatic two-dimensional trapped lee waves simulated by the Meso-NH model. This model is a community research model based on the Lipps?Hemler form of the anelastic system, which has been recently developed by the CNRM of Météo-France and the Laboratoire d?Aérologie of Université Paul Sabatier in France. To analyze how the CVB responds to lee waves, a simple CVB model is first applied to academic atmospheric stationary wave flows, analogous to those encountered during PYREX. This model takes into account the vertical velocity of the surrounding air, geometrical parameters of the balloon, and the atmospheric heating processes. Results show that the CVB reacts well to the atmospheric wave period, with a phase delay of only a few minutes. Three CVB trajectories obtained during the third Intensive Observation Period of PYREX are then computed within Meso-NH 2D simulations from the balloon?s starting point, using the CVB model. The simulated quantities are compared to the experimental CVB data, focusing especially on the lee-wave vertical movements. The simulated lee-wave vertical velocities and amplitude are found to be in good agreement with the observations, as shown by the statistical analysis. The computed CVB heights deviate by less than 13% from the altitude of the measured trajectories. This comparison of the model output to the CVB experimental data demonstrates the good performance of the Meso-NH model in the prediction of the vertical excursions of the lee waves.
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      Trapped Lee Waves Observed during PYREX by Constant Volume Balloons: Comparison with Meso-NH Simulations

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4159106
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    contributor authorKoffi, Ernest N’Dri
    contributor authorGeorgelin, Marc
    contributor authorBenech, Bruno
    contributor authorRichard, Evelyne
    date accessioned2017-06-09T14:36:19Z
    date available2017-06-09T14:36:19Z
    date copyright2000/07/01
    date issued2000
    identifier issn0022-4928
    identifier otherams-22634.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4159106
    description abstractThe main objective of the present paper is the use of a constant volume balloon (CVB) as a tool to (i) study trapped lee waves and (ii) assess the forecasting capability of a nonhydrostatic numerical model. Then, CVB data obtained during the Pyrénées Experiment (PYREX) are compared with nonhydrostatic two-dimensional trapped lee waves simulated by the Meso-NH model. This model is a community research model based on the Lipps?Hemler form of the anelastic system, which has been recently developed by the CNRM of Météo-France and the Laboratoire d?Aérologie of Université Paul Sabatier in France. To analyze how the CVB responds to lee waves, a simple CVB model is first applied to academic atmospheric stationary wave flows, analogous to those encountered during PYREX. This model takes into account the vertical velocity of the surrounding air, geometrical parameters of the balloon, and the atmospheric heating processes. Results show that the CVB reacts well to the atmospheric wave period, with a phase delay of only a few minutes. Three CVB trajectories obtained during the third Intensive Observation Period of PYREX are then computed within Meso-NH 2D simulations from the balloon?s starting point, using the CVB model. The simulated quantities are compared to the experimental CVB data, focusing especially on the lee-wave vertical movements. The simulated lee-wave vertical velocities and amplitude are found to be in good agreement with the observations, as shown by the statistical analysis. The computed CVB heights deviate by less than 13% from the altitude of the measured trajectories. This comparison of the model output to the CVB experimental data demonstrates the good performance of the Meso-NH model in the prediction of the vertical excursions of the lee waves.
    publisherAmerican Meteorological Society
    titleTrapped Lee Waves Observed during PYREX by Constant Volume Balloons: Comparison with Meso-NH Simulations
    typeJournal Paper
    journal volume57
    journal issue13
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(2000)057<2007:TLWODP>2.0.CO;2
    journal fristpage2007
    journal lastpage2021
    treeJournal of the Atmospheric Sciences:;2000:;Volume( 057 ):;issue: 013
    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