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    Quantifying the Roles of Changing Albedo, Emissivity, and Energy Partitioning in the Impact of Irrigation on Atmospheric Heat Content

    Source: Journal of Applied Meteorology and Climatology:;2016:;volume( 055 ):;issue: 008::page 1699
    Author:
    Pryor, S. C.
    ,
    Sullivan, R. C.
    ,
    Wright, T.
    DOI: 10.1175/JAMC-D-15-0291.1
    Publisher: American Meteorological Society
    Abstract: ntroduction of irrigated agriculture changes the partitioning of the surface energy flux between sensible and latent heat (H vs LE) and alters the albedo α and emissivity ε. In the absence of changes in the radiation components of the surface energy balance, the change in the Bowen ratio due to irrigation typically suppresses the local air temperature T but increases the total near-surface atmospheric heat content (as measured using equivalent potential temperature ?e). While the effect of irrigation on surface energy partitioning due to enhanced surface and subsurface water availability has long been acknowledged, the roles of associated changes in ε and α have received less attention, and the scales and magnitudes of these effects remain uncertain. A new methodology designed for application to in situ and remote sensing data is presented and used to demonstrate that the net impact of irrigation on T and ?e is strongly dependent on the regional climate, land cover in surrounding areas, and the amount of irrigation in the upwind fetch. The results suggest that the impact of the radiative forcing terms on net available energy is not negligible and may amplify or offset the impact from changed energy partitioning on T and ?e depending on the specific regional climate and land cover.
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      Quantifying the Roles of Changing Albedo, Emissivity, and Energy Partitioning in the Impact of Irrigation on Atmospheric Heat Content

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4217620
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    contributor authorPryor, S. C.
    contributor authorSullivan, R. C.
    contributor authorWright, T.
    date accessioned2017-06-09T16:51:10Z
    date available2017-06-09T16:51:10Z
    date copyright2016/08/01
    date issued2016
    identifier issn1558-8424
    identifier otherams-75300.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4217620
    description abstractntroduction of irrigated agriculture changes the partitioning of the surface energy flux between sensible and latent heat (H vs LE) and alters the albedo α and emissivity ε. In the absence of changes in the radiation components of the surface energy balance, the change in the Bowen ratio due to irrigation typically suppresses the local air temperature T but increases the total near-surface atmospheric heat content (as measured using equivalent potential temperature ?e). While the effect of irrigation on surface energy partitioning due to enhanced surface and subsurface water availability has long been acknowledged, the roles of associated changes in ε and α have received less attention, and the scales and magnitudes of these effects remain uncertain. A new methodology designed for application to in situ and remote sensing data is presented and used to demonstrate that the net impact of irrigation on T and ?e is strongly dependent on the regional climate, land cover in surrounding areas, and the amount of irrigation in the upwind fetch. The results suggest that the impact of the radiative forcing terms on net available energy is not negligible and may amplify or offset the impact from changed energy partitioning on T and ?e depending on the specific regional climate and land cover.
    publisherAmerican Meteorological Society
    titleQuantifying the Roles of Changing Albedo, Emissivity, and Energy Partitioning in the Impact of Irrigation on Atmospheric Heat Content
    typeJournal Paper
    journal volume55
    journal issue8
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/JAMC-D-15-0291.1
    journal fristpage1699
    journal lastpage1706
    treeJournal of Applied Meteorology and Climatology:;2016:;volume( 055 ):;issue: 008
    contenttypeFulltext
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