Temporal and spatial variability of nocturnal cooling in a complex of small valleys in the Kanto Plain during the winter

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We investigated the temporal and spatial variability of nighttime temperatures in a complex of small valleys in the western Kanto Plain, Saitama Prefecture, Japan, by conducting horizontal and vertical temperature measurements throughout one winter season. The magnitude of nocturnal cooling in the valley was greater in March than during the mid-winter period. The horizontal distribution of mean nighttime temperatures and nocturnal cooling under clear and calm conditions indicated that temperatures in the middle or lower areas of the valleys tended to be lower than those in the upper areas even though the elevation differences were small. Vertical profiles of air temperature measured by a kytoon system on clear nights revealed the development of a temperature inversion above the valley floor at night; the top of the inversion exceeded the height of the ridge adjacent to the valley. Under these conditions, down-valley flows of cold air were a significant phenomenon below the inversion layer. Our results suggest that local nocturnal drainage flow below the temperature inversion could contribute to nocturnal cooling in these valleys.

収録刊行物

  • 農業気象

    農業気象 69(3), 191-200, 2013

    日本農業気象学会

各種コード

  • NII論文ID(NAID)
    130004878297
  • NII書誌ID(NCID)
    AA11530034
  • 本文言語コード
    ENG
  • ISSN
    0021-8588
  • NDL 記事登録ID
    024904245
  • NDL 請求記号
    Z18-388
  • データ提供元
    NDL  J-STAGE 
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