酸素同位体比を利用した低湿度環境における表層水の蒸発率測定法の提案

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タイトル別名
  • PROPOSAL OF MEASUREMENT METHOD FOR EVAPORATION RATE FOR SURFACE WATER USING OXYGEN ISOTOPE IN DRY AREA
  • サンソ ドウイタイヒ オ リヨウ シタ テイシツド カンキョウ ニ オケル ヒョウソウスイ ノ ジョウハツリツ ソクテイホウ ノ テイアン

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抄録

The purpose of this study is to develop a simple method for estimating evaporation rates of water using oxygen isotopic ratio. The proposed method is just to use only δ18Oliq of water and δ18Ovap of vapor and humidity. Under low humidity condition such as less than 60% humidity, variation of the change in δ18Oliq per unit change of the evaporation rate was small. Therefore evaporation rate can be calculated from the change in δ18Oliq per unit change of the evaporation rate and δ18Oliq of evaporated water without measuring of daily temperature and humidity. However, under more than 60% humidity, the change in δ18Oliq per unit change of the evaporation rate was variable and then evaporation rate cannot be calculated.

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