静穏晴天夜間に裸地面直上で観測された大気の放射加熱について

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タイトル別名
  • Radiative Warming of the Air Observed near a Bare-Soil Surface On Calm Clear Nights.
  • セイオン セイテン ヤカン ニ ラ ジメン チョクジョウ デ カンソク サレタ タイキ ノ ホウシャ カネツ ニ ツイテ

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説明

The radiative flux in the lowest three meters above a bare-soil surface was directly measured on calm nights with little cloud cover. Although divergence of upward radiative flux occurred above 1m, convergence was often observed between 0.2m and 1m all through the night. Almost the same results were obtained for the net flux except that the transitional height between divergence and convergence was some tens of centimeters, which means that radiative warming occurred just above the bare-soil surface during the night. This phenomenon can be explained by postulating that cold air is produced by conduction at the surface of small heat-insulated projections (HIPs) such as soil grains on the ground surface, while the ground releases the heat stored during the day by radiation through the pores between HIPs and warms the air immediately above the surface at night. This “HIP hypothesis” can also account for the so-called “raised minimum (RM)” phenomenon.

収録刊行物

  • 農業気象

    農業気象 55 (2), 137-143, 1999

    日本農業気象学会

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