Silicon Isotope Signatures from a Mesocosm Experiment off Peru (2017, SFB754)

The table includes a complete list of nutrient data (Nitrate, Silicate, Phosphate), particulate data (PON, POP, bSi). All units are in μmol/L-1. Phytoplankton data (Diatom and silicoflagellate abundances) in cell counts (cell x 10^6 and %) as well as the as the dissolved and particulate silicon isotope data (‰) from selected Mesocosms (M1, M2, M7) obtained during a KOSMOS Experiment off the Peruvian coast close to San Lorenzo Island (12.0555°S, 77.2348°W) in 2017 (Start: 25th of February, Duration 50 days) . The Project was part of the SFB754. Seawater and particulate samples were taken with a CTD sampler. Every 2nd day, subsamples for nutrients and natural Si isotopes were sampled from the surface layer. For δ30SidSi and δ30SibSi, 115 to 2000 ml of seawater was filtered through a 0.65 μm Polycarbonate filter (Whatman®, 0.65 μm pore size, 47 mm). Immediately after filtration, the seawater filtrate for δ30SidSi was acidified to pH 2 and stored in the dark. Filters for δ30SibSi were dried at 40°C. Dissolved and particulate Si samples were later processed at GEOMAR, Helmholtz Centre for Ocean Research, Kiel, Germany. For details about the sampling see also Bach et al. (2020). The data is published in Biogeosciences Exploring Silicon Isotope Fractionation by Silicoflagellates: Results from a KOSMOS Experiment off Peru.本表格完整收录了营养盐数据（硝酸盐（Nitrate）、硅酸盐（Silicate）、磷酸盐（Phosphate））以及颗粒态数据（颗粒有机氮（PON）、颗粒有机磷（POP）、生物硅（bSi）），所有单位均为μmol/L⁻¹。本数据集同时包含浮游植物（Phytoplankton）数据：硅藻（Diatom）与硅鞭藻（silicoflagellate）的丰度以细胞计数形式呈现（单位：10^6个细胞及占比%）；此外还收录了2017年在秘鲁海岸圣洛伦索岛（San Lorenzo Island，12.0555°S，77.2348°W）附近开展的KOSMOS实验（KOSMOS Experiment）中，从选定的中型实验生态系（Mesocosms，M1、M2、M7）获取的溶解态与颗粒态硅同位素数据（单位：‰）。该实验于2月25日启动，持续时长50天。本项目属于SFB754研究计划的一部分。海水及颗粒态样品通过温盐深采样器（CTD sampler）采集。每间隔2日，从表层水体采集营养盐与天然硅同位素的子样品。针对δ30SidSi与δ30SibSi样品，取115至2000 mL海水通过0.65 μm聚碳酸酯滤膜（Polycarbonate filter，Whatman®，孔径0.65 μm，直径47 mm）进行过滤。过滤完成后，立即将用于δ30SidSi分析的海水滤液酸化至pH=2，并于避光条件下保存；用于δ30SibSi分析的滤膜则置于40℃环境下烘干。溶解态与颗粒态硅样品后续均在德国基尔亥姆霍兹海洋研究中心（GEOMAR, Helmholtz Centre for Ocean Research, Kiel, Germany）完成前处理与分析。有关采样的详细细节可参考Bach等人（2020）的研究成果。本数据集已发表于《生物地球科学（Biogeosciences）》期刊论文"Exploring Silicon Isotope Fractionation by Silicoflagellates: Results from a KOSMOS Experiment off Peru"中。