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    Modeling Seasonal Changes in the Temperature Lapse Rate in a Northern Thailand Mountainous Area

    Source: Journal of Applied Meteorology and Climatology:;2010:;volume( 049 ):;issue: 006::page 1233
    Author:
    Komatsu, Hikaru
    ,
    Hashimoto, Hirofumi
    ,
    Kume, Tomonori
    ,
    Tanaka, Nobuaki
    ,
    Yoshifuji, Natsuko
    ,
    Otsuki, Kyoichi
    ,
    Suzuki, Masakazu
    ,
    Kumagai, Tomo’omi
    DOI: 10.1175/2010JAMC2297.1
    Publisher: American Meteorological Society
    Abstract: Temperature data in the mountain forest regions are often extrapolated from temperature data recorded at base stations at lower elevation. Such extrapolation is often based on elevation differences between target regions and base stations at low elevation assuming a constant temperature lapse rate throughout the year. However, this assumption might be problematic where slope circulation is active and decoupled from the regional circulation. To model the seasonal change in the lapse rate, the authors compared daily maximum (Tmax) and minimum temperatures (Tmin) observed at a mountain forest site (Kog?Ma; 1300-m altitude) with those observed at the bottom of the basin (Chiang?Mai; 314-m altitude) in northern Thailand, where slope circulation is active and decoupled from the regional circulation. The difference in Tmax between Kog?Ma and Chiang?Mai (?Tmax; Kog?Ma minus Chiang?Mai) was relatively unchanged throughout the year. However, the difference in Tmin between Kog?Ma and Chiang?Mai (?Tmin) changed seasonally. Thus, assuming a constant lapse rate throughout the year could cause large errors in extrapolating Tmin data in mountainous areas in northern Thailand. The difference ?Tmin was related to nighttime net radiation (Rn), suggesting that nocturnal drainage flow affects the determination of ?Tmin. This relationship would be useful in formulating seasonal changes in the lapse rate for Tmin. As Rn data are generally unavailable for meteorological stations, an index that relates to the lapse rate for Tmin and is calculated from Tmax and Tmin data is proposed. This index might be useful for accurately estimating Tmin values in mountainous regions in northern Thailand.
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      Modeling Seasonal Changes in the Temperature Lapse Rate in a Northern Thailand Mountainous Area

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4211708
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    contributor authorKomatsu, Hikaru
    contributor authorHashimoto, Hirofumi
    contributor authorKume, Tomonori
    contributor authorTanaka, Nobuaki
    contributor authorYoshifuji, Natsuko
    contributor authorOtsuki, Kyoichi
    contributor authorSuzuki, Masakazu
    contributor authorKumagai, Tomo’omi
    date accessioned2017-06-09T16:33:34Z
    date available2017-06-09T16:33:34Z
    date copyright2010/06/01
    date issued2010
    identifier issn1558-8424
    identifier otherams-69980.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4211708
    description abstractTemperature data in the mountain forest regions are often extrapolated from temperature data recorded at base stations at lower elevation. Such extrapolation is often based on elevation differences between target regions and base stations at low elevation assuming a constant temperature lapse rate throughout the year. However, this assumption might be problematic where slope circulation is active and decoupled from the regional circulation. To model the seasonal change in the lapse rate, the authors compared daily maximum (Tmax) and minimum temperatures (Tmin) observed at a mountain forest site (Kog?Ma; 1300-m altitude) with those observed at the bottom of the basin (Chiang?Mai; 314-m altitude) in northern Thailand, where slope circulation is active and decoupled from the regional circulation. The difference in Tmax between Kog?Ma and Chiang?Mai (?Tmax; Kog?Ma minus Chiang?Mai) was relatively unchanged throughout the year. However, the difference in Tmin between Kog?Ma and Chiang?Mai (?Tmin) changed seasonally. Thus, assuming a constant lapse rate throughout the year could cause large errors in extrapolating Tmin data in mountainous areas in northern Thailand. The difference ?Tmin was related to nighttime net radiation (Rn), suggesting that nocturnal drainage flow affects the determination of ?Tmin. This relationship would be useful in formulating seasonal changes in the lapse rate for Tmin. As Rn data are generally unavailable for meteorological stations, an index that relates to the lapse rate for Tmin and is calculated from Tmax and Tmin data is proposed. This index might be useful for accurately estimating Tmin values in mountainous regions in northern Thailand.
    publisherAmerican Meteorological Society
    titleModeling Seasonal Changes in the Temperature Lapse Rate in a Northern Thailand Mountainous Area
    typeJournal Paper
    journal volume49
    journal issue6
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/2010JAMC2297.1
    journal fristpage1233
    journal lastpage1246
    treeJournal of Applied Meteorology and Climatology:;2010:;volume( 049 ):;issue: 006
    contenttypeFulltext
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