Alkane data in the SZY18 peat core
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Exploring the seasonal atmospheric processes involved with hydroclimate changes of the East Asian Summer Monsoon (EASM) during the Mystery Interval (MI, 17.5-14.5 ka BP) will enhance understanding of the EASM climate system. Here the δ<sup>2</sup>H values of leaf wax <em>n</em>-alkanes (δ<sup>2</sup>H<sub>alk</sub>) in a wetland core retrieved from southern China are relatively negative during the MI, contrasting to positive excursion recorded by stalagmite δ<sup>18</sup>O. Considering the overlap of the primary synthesis time of leaf waxes in deciduous woody plants and periods of precipitation δ<sup>2</sup>H alteration in the EASM (late spring to early summer), we interpret the relatively negative signal of δ<sup>2</sup>H<sub>alk</sub> in the wetland core as the early onset of summer rainfall during the MI. The early onset of summer rainfall was likely due to the early northeastward shifting of the Western Pacific subtropical high due to the low land-sea thermogradient between the Qinghai-Tibet Plateau and the West Pacific Ocean.
