Sorption experiments with dissolved organic carbon and characterized dust samples from ephemeral rivers in Namibia

Sorption experiments were conducted to investigate the effect of dust deposition in the ocean on the concentration of dissolved organic carbon (DOC). This dataset includes the characterization of dust samples collected from the dry riverbeds of the ephemeral rivers Kuiseb and Omaruru in Namibia in April 2023, as well as the results of the sorption experiments. Dust samples were collected in the form of silt crust from two locations along the Kuiseb River, near the Gobabeb research station and Rooibank, and from one location along the Omaruru River. The samples were gently loosened and sieved through a 63 µm mesh sieve, and only the <63 µm fraction was used for dust characterization and sorption experiments. Two types of sorption experiments were performed. To analyse the release of OC, dust was added to artificial seawater. In addition, time series were performed in which dust was added to a solution of artificial seawater and 13C-labeled Spirulina extract.

本研究通过吸附实验，旨在探讨海洋中尘埃沉积对溶解有机碳（DOC）浓度的影响。本数据集收录了2023年4月在纳米比亚间歇性河流库伊塞布和奥玛鲁鲁河的干河床中采集的尘埃样本的表征，以及吸附实验的结果。尘埃样本以泥浆皮的形式从库伊塞布河沿岸的两个地点（戈巴贝研究站和罗伊班克）以及奥玛鲁鲁河沿岸的一个地点收集。样本被轻轻松动并通过63微米网孔筛筛选，仅使用<63微米的尘埃部分进行尘埃表征和吸附实验。进行了两种类型的吸附实验。为了分析有机碳（OC）的释放，将尘埃添加到人工海水中。此外，还进行了时间序列实验，其中将尘埃添加到人工海水和13C标记的螺旋藻提取物溶液中。