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    Thermal and Geometric Controls on the Rate of Surface Air Temperature Changes in a Medium-Sized, Midlatitude City

    Source: Journal of Applied Meteorology and Climatology:;2007:;volume( 046 ):;issue: 002::page 241
    Author:
    Tomita, Tomohiko
    ,
    Kusaka, Hiroyuki
    ,
    Akiyoshi, Ryo
    ,
    Imasato, Yoshiyuki
    DOI: 10.1175/JAM2486.1
    Publisher: American Meteorological Society
    Abstract: Gradual cooling in the evening forms a wintertime nocturnal urban heat island. This work, with a mesoscale model involving urban canopy physics, is an examination of how four thermal and geometric controls?anthropogenic heat QF, heat capacity C, thermal conductivity k, and sky-view factor ?s?modify the rate of surface air temperature changes ?T/?t. In particular, the time dependence is diagnosed through numerical experiments. The controls QF and k are major agents in the evening, when QF changes the evening ?T/?t linearly and k is logarithmic. The effects of C and ?s are large in the morning and in the afternoon with those of k. The impact of QF is, however, substantial only in the evening. Because the time dependence of C and k is different, the thermal inertia used as a parameter in the urban climate studies should be divided into two parameters: C and k. To improve the thermal environment in urban areas, the modification of QF and k could be effective.
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      Thermal and Geometric Controls on the Rate of Surface Air Temperature Changes in a Medium-Sized, Midlatitude City

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4216637
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    contributor authorTomita, Tomohiko
    contributor authorKusaka, Hiroyuki
    contributor authorAkiyoshi, Ryo
    contributor authorImasato, Yoshiyuki
    date accessioned2017-06-09T16:48:12Z
    date available2017-06-09T16:48:12Z
    date copyright2007/02/01
    date issued2007
    identifier issn1558-8424
    identifier otherams-74414.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4216637
    description abstractGradual cooling in the evening forms a wintertime nocturnal urban heat island. This work, with a mesoscale model involving urban canopy physics, is an examination of how four thermal and geometric controls?anthropogenic heat QF, heat capacity C, thermal conductivity k, and sky-view factor ?s?modify the rate of surface air temperature changes ?T/?t. In particular, the time dependence is diagnosed through numerical experiments. The controls QF and k are major agents in the evening, when QF changes the evening ?T/?t linearly and k is logarithmic. The effects of C and ?s are large in the morning and in the afternoon with those of k. The impact of QF is, however, substantial only in the evening. Because the time dependence of C and k is different, the thermal inertia used as a parameter in the urban climate studies should be divided into two parameters: C and k. To improve the thermal environment in urban areas, the modification of QF and k could be effective.
    publisherAmerican Meteorological Society
    titleThermal and Geometric Controls on the Rate of Surface Air Temperature Changes in a Medium-Sized, Midlatitude City
    typeJournal Paper
    journal volume46
    journal issue2
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/JAM2486.1
    journal fristpage241
    journal lastpage247
    treeJournal of Applied Meteorology and Climatology:;2007:;volume( 046 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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