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    Estimation of Spatial Degrees of Freedom of a Climate Field

    Source: Journal of Climate:;1999:;volume( 012 ):;issue: 005::page 1280
    Author:
    Wang, Xiaochun
    ,
    Shen, Samuel S.
    DOI: 10.1175/1520-0442(1999)012<1280:EOSDOF>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: This paper analyzes four methods for estimating the spatial degrees of freedom (dof) of a climate field: the ?2 method, the Z method, the S method, and the B method. The results show that the B method provides the most accurate estimate of the dof. The ?2 method, S method, and Z method yield underestimates when the number of realizations of the field is not sufficiently large or the field?s mean and variance vary with respect to spatial location. The dof of the monthly surface temperature field is studied numerically. The B method shows that the dof of the Northern Hemisphere (NH) has an obvious annual cycle, which is around 60 in the winter months and 90 in the summer months. The dof for the Southern Hemisphere (SH) varies between 35 and 50, with large values during its winter months and small ones during its summer months. The dof of the global temperature field demonstrates a similar annual cycle to that of the NH. The dof estimated from the observational data is smaller than that from the GFDL GCM model output of the surface air temperature. In addition, the model output for the SH shows the opposite phase of the seasonal cycle of the dof: large dof in summer and small ones in winter.
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      Estimation of Spatial Degrees of Freedom of a Climate Field

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4191667
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    contributor authorWang, Xiaochun
    contributor authorShen, Samuel S.
    date accessioned2017-06-09T15:43:51Z
    date available2017-06-09T15:43:51Z
    date copyright1999/05/01
    date issued1999
    identifier issn0894-8755
    identifier otherams-5194.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4191667
    description abstractThis paper analyzes four methods for estimating the spatial degrees of freedom (dof) of a climate field: the ?2 method, the Z method, the S method, and the B method. The results show that the B method provides the most accurate estimate of the dof. The ?2 method, S method, and Z method yield underestimates when the number of realizations of the field is not sufficiently large or the field?s mean and variance vary with respect to spatial location. The dof of the monthly surface temperature field is studied numerically. The B method shows that the dof of the Northern Hemisphere (NH) has an obvious annual cycle, which is around 60 in the winter months and 90 in the summer months. The dof for the Southern Hemisphere (SH) varies between 35 and 50, with large values during its winter months and small ones during its summer months. The dof of the global temperature field demonstrates a similar annual cycle to that of the NH. The dof estimated from the observational data is smaller than that from the GFDL GCM model output of the surface air temperature. In addition, the model output for the SH shows the opposite phase of the seasonal cycle of the dof: large dof in summer and small ones in winter.
    publisherAmerican Meteorological Society
    titleEstimation of Spatial Degrees of Freedom of a Climate Field
    typeJournal Paper
    journal volume12
    journal issue5
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(1999)012<1280:EOSDOF>2.0.CO;2
    journal fristpage1280
    journal lastpage1291
    treeJournal of Climate:;1999:;volume( 012 ):;issue: 005
    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