(Table 3) Comparison of the relative contribution of diatom groups built with PCA in the trap site JAM at five surface sediment locations (GeoB: 10041-3, 10037-2, 10036-3, 10039-3, and 10038-3) and at Site GeoB10038-4

b: Sample at 2 cm depth (ca. 230 years).c: Average for the entire sampling period (0-130 ka).Surface sediments: only the uppermost centimeter (0-1 cm) of undisturbed surface sediment has been used.

b: 样本采集深度为2厘米（约230年前）。c: 整个采样期间（0-130千年前）的平均值。表层沉积物：仅使用未受扰动的表层沉积物最上层的1厘米（0-1厘米）。