DEW POINT ELEVATION AND OXYGEN AND HYDROGEN ISOTOPIC RATIOS FOR PRECIPITATION SAMPLED AT OSAKA AND MATSUE, JAPAN

Authors

  • Tetsuya Fukano
  • Hiroyuki Ii

Keywords:

Isotopic ratio, Altitude effect, Dew point elevation, Evaporation, Precipitation

Abstract

Dew point elevation was clarified to be an important factor determining stable isotope values
of precipitation. When dew point elevation is high, stable isotope values for precipitation were clarified to
increase due to the evaporation process which occurred during dropping from dew point elevation to the ground.
In winter wet air from the Japan Sea passes over mountains in the center of Japan and dry air after precipitated
at the mountains reaches at the Inland Sea. Subsequently, it is thought that when dew point elevation increases,
stable isotope values for precipitation increase with the distance from dew point elevation to the ground then
high dew point elevation raises the average isotope value of precipitation. Therefore, the elevation of the
precipitation point decreases with an increase of the isotope value. Consequently, altitude effect is thought to
be caused by precipitation with high dew point elevation. High dew point elevation and high stable isotope
values for precipitation in winter were observed at Osaka in the Inland Sea. On the other hand, these high
values at Matsue on the Japan Sea side in winter were rarely observed because of low dew point elevation with
wet air.

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Published

2021-11-12

How to Cite

Tetsuya Fukano, & Hiroyuki Ii. (2021). DEW POINT ELEVATION AND OXYGEN AND HYDROGEN ISOTOPIC RATIOS FOR PRECIPITATION SAMPLED AT OSAKA AND MATSUE, JAPAN. GEOMATE Journal, 11(27), 2712–2716. Retrieved from https://geomatejournal.com/geomate/article/view/2759

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