Bottom water chemistry during in-situ incubation experiments on enhanced benthic calcite weathering in July 2025

The data was produced during a 16 day in-situ incubation experiment in the Baltic Sea. In order to assess the potential for enhanced benthic calcite weathering as a ocean alkalinisation and thus negative emissions strategy, a Biogeochemical Observatory (BIGO, Sommer et al., 2009) was deployed at 54° 34.432 N, 10° 10.776 E, at 22 m water depth between 2025-07-12 and 2025-07-29. The BIGO is equipped with two benthic chambers that were lowerd to the sea floor. In chamber two, 29 g of fine calcite powder were added to the bottom water. 7 Samples were taken via an automatted glassyringe sampler from each chamber and the ambient bottom water.本数据集源自波罗的海海域开展的为期16天的原位培养实验。为评估强化底栖方解石风化作为海洋碱化（进而作为负排放策略）的可行性，研究团队于2025年7月12日至2025年7月29日期间，在水深22米的54° 34.432 N、10° 10.776 E海域部署了生物地球化学观测站（Biogeochemical Observatory，缩写BIGO，源自Sommer等2009年的研究）。该观测站搭载两套沉降至海底的底栖培养舱；其中二号培养舱内被添加了29克细颗粒方解石粉末至底层海水中。研究人员通过自动化玻璃注射器采样器，从每个培养舱以及周围的底层海水中采集了7份样本。