<div>As shown in Fig. 4, the formula for the local meteoric water line (LMWL)
established based on the data of precipitation isotopes obtained from
1986 to 2013 is δ<sup>2</sup>H = 8.29δ<sup>18</sup>O +
7.44, and the correlation coefficient is 0.93. Compared with the global
meteoric water line (GMWL) formula proposed by the IAEA-World
Meteorological Organization and Craig (δ<sup>2</sup>H =
8δ<sup>18</sup>O + 10), the collected 115 samples of
precipitation isotopes are all located near the GMWL, and the majority
of the samples are found to be on the upper left of the GMWL. In
addition, the slope of the LMWL is 8.29, which is higher than the slope
of the GMWL of 8. The shift in slope reflects a different degree of
non-equilibrium fractionation in Wuhan than the global average during
the experiment (Chen <i>et al.</i> , 2016).</div>