Coccosphere-units of sediment trap OG4

Coccosphere-unit: Conversion of coccoliths to hypothetical coccospheres by taking an average number of coccoliths per coccosphere.颗石球单元（Coccosphere-unit）：通过计算单颗颗石球（coccosphere）平均包含的颗石粒（coccoliths）数量，将颗石粒转换为假想颗石球的处理方法。