Limacina helicina shell dissolution due to ocean acidification in the California Current Ecosystem from 2011-08-11 to 2013-08-29 (NCEI Accession 0155173)

Pteropod shell dissolution was determined on shells collected from 16 stations for the 2011 cruise and 20 stations during the 2013 cruise. The samples were stored in 90% buffered ethanol. Between 15 to 30 pteropods of Limacina helicina were picked from samples selected randomly. Following the methods described in Bednarsek et al. (2012), shells were repeatedly washed with distilled water before being subjected to chemical shell dehydration, followed by a plasma etching procedure for periostracum removal. All treated shells were analyzed for shell dissolution using a scanning electron microscope (SEM) and identified for the presence of dissolution patterns and the type of more severe types of shell dissolution (Type II and Type III). Following the categorization scheme outlined in Bednarsek et al. (2012), Type II dissolution indicates deeper penetrating dissolution that precedes Type III, which affects large parts of shell crystalline structure, making shells less compact and more fragile. The data files show the percentage of individuals with Type II or Type III shell dissolution in relation to integrated omega saturation state in the upper100 m for each sampled station. For 2011, we also have data on the abundance of pteropods (ind m-2) in relation to integrated omega saturation state.

本研究对2011年航次16个站位、2013年航次20个站位采集的翼足类（pteropod）壳体，开展了壳体溶解状况的测定。所有样品均保存于90%缓冲乙醇中。从随机选取的样品中挑取15至30枚海蝶螺（Limacina helicina）壳体。参照Bednarsek等人（2012）所报道的实验方法，先用蒸馏水反复冲洗壳体，随后进行化学脱水处理，再通过等离子蚀刻工艺去除壳体的壳皮。所有经上述处理的壳体均通过扫描电子显微镜（SEM）开展溶解特征分析，鉴定其溶解模式，并区分两类重度壳体溶解类型（II型与III型）。参照Bednarsek等人（2012）提出的分类方案，II型溶解指穿透程度更深的溶解过程，其发生早于III型溶解；III型溶解会破坏壳体大面积的晶体结构，导致壳体紧实度下降且脆性提升。本数据集展示了各采样站位上层100米积分文石饱和状态下，出现II型或III型壳体溶解的个体占比情况。此外，2011年航次还附带了翼足类丰度（ind m⁻²）与上层100米积分文石饱和状态的相关数据。