The d18O-H2O ratios varied between 10.0‰ and 8.9‰ with a mean value of 9.4‰ over all stations in SC1, and between 13.4‰ and 10.4‰ with a mean value of 12.1‰ over all stations in SC2, respectively. Significant seasonal changes in the isotopic compositions were observed from SC1 (in summer 2012) to SC2 (in spring 2013), with 2.7‰ and 23‰ decreases in the mean over all stations for d18O-H2O and dD, respectively (Table 1, Fig. 4).