Median grain size of North Sea surface sediments

purpose: The map shows the median grain size (or d50) of surface sediments in the North Sea predicted by interpolation of legacy grain size distribution...研究目的：该地图展示了通过对既往沉积物粒度分布数据进行插值预测得到的北海表层沉积物中值粒径（median grain size，即d50）……