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    Diurnal Covariation in Soil Heat Flux and Net Radiation

    Source: Journal of Applied Meteorology:;2003:;volume( 042 ):;issue: 006::page 851
    Author:
    Santanello, Joseph A.
    ,
    Friedl, Mark A.
    DOI: 10.1175/1520-0450(2003)042<0851:DCISHF>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Diurnal variation in soil heat flux is a key constraint on the amount of energy available for sensible and latent heating of the lower troposphere. Many studies have demonstrated that soil heat flux G is strongly correlated with net radiation Rn. However, methods to parameterize G based on this relationship typically do not account for the dependency of G on soil properties and ignore asymmetry in the diurnal variation of G relative to Rn. In this paper, the diurnal behavior of G as a function of Rn is examined for sparse cover and bare soil conditions, focusing on patterns of diurnal variation as well as on the effects of soil moisture and soil type. To this end, information from field data is combined with simulations from a multilayer, diffusion-based soil model over a range of soil conditions and vegetation densities. The results show that a relatively simple function can be used to capture the first-order diurnal covariation between G and Rn. Within this framework, soil moisture exerts an important control on this relationship. When soils make the transition from stage-1 (atmosphere limited) to stage-2 (soil limited) evaporation, the ratio of G to Rn tends to increase. Further, soils in stage-2 evaporation exhibit positive G later in the day relative to moist soils. Data from several field experiments show that the amplitude of diurnal surface temperature can be used to predict the magnitude and behavior of G/Rn by integrating the effects of soil type and moisture. Based on these results, a method to estimate G/Rn is proposed that provides a robust representation of G/Rn on hourly timescales for varying soil conditions. This method provides improvement over previous semiempirical treatments for G for which diurnal energy balance closure is required.
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      Diurnal Covariation in Soil Heat Flux and Net Radiation

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    contributor authorSantanello, Joseph A.
    contributor authorFriedl, Mark A.
    date accessioned2017-06-09T14:08:47Z
    date available2017-06-09T14:08:47Z
    date copyright2003/06/01
    date issued2003
    identifier issn0894-8763
    identifier otherams-13252.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4148682
    description abstractDiurnal variation in soil heat flux is a key constraint on the amount of energy available for sensible and latent heating of the lower troposphere. Many studies have demonstrated that soil heat flux G is strongly correlated with net radiation Rn. However, methods to parameterize G based on this relationship typically do not account for the dependency of G on soil properties and ignore asymmetry in the diurnal variation of G relative to Rn. In this paper, the diurnal behavior of G as a function of Rn is examined for sparse cover and bare soil conditions, focusing on patterns of diurnal variation as well as on the effects of soil moisture and soil type. To this end, information from field data is combined with simulations from a multilayer, diffusion-based soil model over a range of soil conditions and vegetation densities. The results show that a relatively simple function can be used to capture the first-order diurnal covariation between G and Rn. Within this framework, soil moisture exerts an important control on this relationship. When soils make the transition from stage-1 (atmosphere limited) to stage-2 (soil limited) evaporation, the ratio of G to Rn tends to increase. Further, soils in stage-2 evaporation exhibit positive G later in the day relative to moist soils. Data from several field experiments show that the amplitude of diurnal surface temperature can be used to predict the magnitude and behavior of G/Rn by integrating the effects of soil type and moisture. Based on these results, a method to estimate G/Rn is proposed that provides a robust representation of G/Rn on hourly timescales for varying soil conditions. This method provides improvement over previous semiempirical treatments for G for which diurnal energy balance closure is required.
    publisherAmerican Meteorological Society
    titleDiurnal Covariation in Soil Heat Flux and Net Radiation
    typeJournal Paper
    journal volume42
    journal issue6
    journal titleJournal of Applied Meteorology
    identifier doi10.1175/1520-0450(2003)042<0851:DCISHF>2.0.CO;2
    journal fristpage851
    journal lastpage862
    treeJournal of Applied Meteorology:;2003:;volume( 042 ):;issue: 006
    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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