Iceberg rafted debris flux on the Sabrina continental slope - for A042_KC14

Ice-rafted debris is characterised by coarse material with typically angular grains, transported within icebergs and deposted in the ocean as the icebergs melt. This iceberg rafted debris (IBRD) flux data submitted here, was calculated by quantifying the coarse sand fraction (CSF) as a percentage of the bulk sample (weight of grains in the 250 micron to 2 mm size fraction), the dry bulk density (DBD) and the linear sedimentation rate (LSR) (following Krissek et al., 1995, Patterson et al., 2014). A method for quantifying the IBRD flux uses the coarse sand fraction (CSF) as a percentage of the bulk sample, dry bulk density (DBD) and the linear sedimentation rate (LSR) (Krissek et al., 1995, Patterson et al., 2014):The CSF (250μm-2mm) was acquired from samples at 10cm intervals along KC14 by wet-sieving approximately 20g of sediment per sample. Authigenic grains and microfossils were removed from the samples under a microscope. The remaining material was weighed on a microbalance and calculated as a percentage of the bulk sample. The DBD was calculated by subsampling approximately 8cm3 of sediment from the same depth intervals and dividing the dry weight of the sediment by the volume of the subsampler. The LSR was approximated by dividing the distance (cm) between the calibrated bulk carbon ages by the difference in time (kyr). The IBRD flux was then quantified using the above equation for each depth interval.

冰筏碎屑（Ice-rafted debris）的特征是通常具有棱角颗粒的粗粒物质，随冰山漂移并在冰山融化时沉积于海洋中。本文提交的冰山筏碎屑（IBRD）通量数据，是通过量化粗砂组分（CSF）占整体样品的百分比（250微米至2毫米粒径范围内颗粒的重量）、干体积密度（DBD）和线性沉积速率（LSR）（遵循Krissek等人，1995；Patterson等人，2014）计算得出的。

量化IBRD通量的方法需使用粗砂组分占整体样品的百分比、干体积密度和线性沉积速率（Krissek等人，1995；Patterson等人，2014）：

CSF（250μm-2mm）通过对KC14钻孔中每10厘米间隔的样品进行湿筛（每份样品约20克沉积物）获得。自生颗粒（authigenic grains）和微体化石（microfossils）在显微镜下从样品中去除。剩余物质用微量天平称重，并计算其占整体样品的百分比。DBD通过从相同深度间隔取约8cm³沉积物子样，将沉积物干重除以取样器体积计算得出。LSR通过将校准后的整体碳年龄之间的距离（厘米）除以时间差（千年）近似得出。随后，利用上述公式对每个深度间隔的IBRD通量进行量化。