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    The Impact of High-Resolution SALLJEX Data on Global NCEP Analyses

    Source: Journal of Climate:;2007:;volume( 020 ):;issue: 023::page 5765
    Author:
    Herdies, Dirceu L.
    ,
    Kousky, Vernon E.
    ,
    Ebisuzaki, Wesley
    DOI: 10.1175/2007JCLI1375.1
    Publisher: American Meteorological Society
    Abstract: A data assimilation study was performed to assess the impact of observations from the South American Low-Level Jet Experiment (SALLJEX) on analyses in the region east of the Andes Mountains from western Brazil to central Argentina. The Climate Data Assimilation Systems (CDAS)-1 and -2 and the Global Data Assimilation System (GDAS) were run with and without the additional SALLJEX rawinsondes and pilot balloon observations. The experiments for each data assimilation system revealed similar features, with a stronger low-level flow east of the Andes when SALLJEX data were included. GDAS had the strongest low-level jet (LLJ) when compared with observations. In the experiments that used additional rawinsonde and pilot balloon data, the LLJ was displaced westward in comparison to the analyses run without the SALLJEX data. The vertical structure of the meridional wind in the analyses was much closer to observed rawinsonde profiles in the experiments that included SALLJEX data than in the control experiments, and the results show that, although there are more pilot balloon observations than rawinsonde observations in the SALLJEX dataset, most of the improvements in the analyses can be obtained by only including rawinsonde observations. This was especially true for GDAS. The results of this study can serve as a benchmark for similar data impact studies using higher-resolution data assimilation systems.
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      The Impact of High-Resolution SALLJEX Data on Global NCEP Analyses

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    contributor authorHerdies, Dirceu L.
    contributor authorKousky, Vernon E.
    contributor authorEbisuzaki, Wesley
    date accessioned2017-06-09T16:19:03Z
    date available2017-06-09T16:19:03Z
    date copyright2007/12/01
    date issued2007
    identifier issn0894-8755
    identifier otherams-65639.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4206886
    description abstractA data assimilation study was performed to assess the impact of observations from the South American Low-Level Jet Experiment (SALLJEX) on analyses in the region east of the Andes Mountains from western Brazil to central Argentina. The Climate Data Assimilation Systems (CDAS)-1 and -2 and the Global Data Assimilation System (GDAS) were run with and without the additional SALLJEX rawinsondes and pilot balloon observations. The experiments for each data assimilation system revealed similar features, with a stronger low-level flow east of the Andes when SALLJEX data were included. GDAS had the strongest low-level jet (LLJ) when compared with observations. In the experiments that used additional rawinsonde and pilot balloon data, the LLJ was displaced westward in comparison to the analyses run without the SALLJEX data. The vertical structure of the meridional wind in the analyses was much closer to observed rawinsonde profiles in the experiments that included SALLJEX data than in the control experiments, and the results show that, although there are more pilot balloon observations than rawinsonde observations in the SALLJEX dataset, most of the improvements in the analyses can be obtained by only including rawinsonde observations. This was especially true for GDAS. The results of this study can serve as a benchmark for similar data impact studies using higher-resolution data assimilation systems.
    publisherAmerican Meteorological Society
    titleThe Impact of High-Resolution SALLJEX Data on Global NCEP Analyses
    typeJournal Paper
    journal volume20
    journal issue23
    journal titleJournal of Climate
    identifier doi10.1175/2007JCLI1375.1
    journal fristpage5765
    journal lastpage5783
    treeJournal of Climate:;2007:;volume( 020 ):;issue: 023
    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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