(Table 1) Age determination of sediment core SONK_11_D

Sediment depth is given in composite depth (mcd). Conventional 14C ages were calibrated using OxCal 4.1 (Ramsey, 1995, 2001, 2009) with the IntCal09 calibration data set (Reimer et al., 2009). Conventional 14C ages obtained from aquatic material and bulk sediment OM were corrected by -150 years before calibration to consider the hardwater effect. Samples down to 0.215 mcd were not considered for age modeling.

沉积物深度以复合深度（meters composite depth，mcd）表示。常规¹⁴C年龄采用OxCal 4.1软件（Ramsey, 1995, 2001, 2009）结合IntCal09校准数据集（Reimer等, 2009）进行校正。从水生物质及沉积物全有机质中获取的常规¹⁴C年龄，在校准前需先减去150年，以抵消硬水效应（hardwater effect）的影响。深度不超过0.215 mcd的沉积物样品未被纳入年龄模型构建。