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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Water sampling using a drone at Yugama crater lake, Kusatsu-Shirane volcano, Japan

Fig. 4

Temporal changes in water chemistry in Yugama crater lake. Temporal changes in the chemical concentrations and stable isotope ratios of Yugama lake water sampled by drone at site B on October 18, 2017 (red closed circles), and regularly sampled by hand at site U1 from September to November in 2017 (black circles). a Cl ions and daily precipitation observed at Yugama crater, b δ18O, c SO4/Cl, and d Mg/Cl

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