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    An Examination of Precipitation in Observations and Model Forecasts during NAME with Emphasis on the Diurnal Cycle

    Source: Journal of Climate:;2007:;volume( 020 ):;issue: 009::page 1680
    Author:
    Janowiak, John E.
    ,
    Dagostaro, Valery J.
    ,
    Kousky, Vernon E.
    ,
    Joyce, Robert J.
    DOI: 10.1175/JCLI4084.1
    Publisher: American Meteorological Society
    Abstract: Summertime rainfall over the United States and Mexico is examined and is compared with forecasts from operational numerical prediction models. In particular, the distribution of rainfall amounts is examined and the diurnal cycle of rainfall is investigated and compared with the model forecasts. This study focuses on a 35-day period (12 July?15 August 2004) that occurred amid the North American Monsoon Experiment (NAME) field campaign. Three-hour precipitation forecasts from the numerical models were validated against satellite-derived estimates of rainfall that were adjusted by daily rain gauge data to remove bias from the remotely sensed estimates. The model forecasts that are evaluated are for the 36?60-h period after the model initial run time so that the effects of updated observational data are reduced substantially and a more direct evaluation of the model precipitation parameterization can be accomplished. The main findings of this study show that the effective spatial resolution of the model-generated precipitation is considerably more coarse than the native model resolution. On a national scale, the models overforecast the frequency of rainfall events in the 1?75 mm day?1 range and underforecast heavy events (>85 mm day?1). The models also have a diurnal cycle that peaks 3?6 h earlier than is observed over portions of the eastern United States and the NAME tier-1 region. Time series and harmonic analysis are used to identify where the models perform well and poorly in characterizing the amplitude and phase of the diurnal cycle of precipitation.
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      An Examination of Precipitation in Observations and Model Forecasts during NAME with Emphasis on the Diurnal Cycle

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4221228
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    contributor authorJanowiak, John E.
    contributor authorDagostaro, Valery J.
    contributor authorKousky, Vernon E.
    contributor authorJoyce, Robert J.
    date accessioned2017-06-09T17:02:59Z
    date available2017-06-09T17:02:59Z
    date copyright2007/05/01
    date issued2007
    identifier issn0894-8755
    identifier otherams-78547.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4221228
    description abstractSummertime rainfall over the United States and Mexico is examined and is compared with forecasts from operational numerical prediction models. In particular, the distribution of rainfall amounts is examined and the diurnal cycle of rainfall is investigated and compared with the model forecasts. This study focuses on a 35-day period (12 July?15 August 2004) that occurred amid the North American Monsoon Experiment (NAME) field campaign. Three-hour precipitation forecasts from the numerical models were validated against satellite-derived estimates of rainfall that were adjusted by daily rain gauge data to remove bias from the remotely sensed estimates. The model forecasts that are evaluated are for the 36?60-h period after the model initial run time so that the effects of updated observational data are reduced substantially and a more direct evaluation of the model precipitation parameterization can be accomplished. The main findings of this study show that the effective spatial resolution of the model-generated precipitation is considerably more coarse than the native model resolution. On a national scale, the models overforecast the frequency of rainfall events in the 1?75 mm day?1 range and underforecast heavy events (>85 mm day?1). The models also have a diurnal cycle that peaks 3?6 h earlier than is observed over portions of the eastern United States and the NAME tier-1 region. Time series and harmonic analysis are used to identify where the models perform well and poorly in characterizing the amplitude and phase of the diurnal cycle of precipitation.
    publisherAmerican Meteorological Society
    titleAn Examination of Precipitation in Observations and Model Forecasts during NAME with Emphasis on the Diurnal Cycle
    typeJournal Paper
    journal volume20
    journal issue9
    journal titleJournal of Climate
    identifier doi10.1175/JCLI4084.1
    journal fristpage1680
    journal lastpage1692
    treeJournal of Climate:;2007:;volume( 020 ):;issue: 009
    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
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