Hydrocarbons in water, suspended matter, and bottom sediments of the White Sea

Data are presented on concentration and composition of aliphatic and polycyclic aromatic hydrocarbons (HC) in water, suspended matter (collected with a Juday net and by a separator), and in bottom sediments of the White Sea. It was found that during the last years the level of aliphatic HC concentrations in waters of the White Sea (aver. 18 µg/l) practically did not change and was comparable with average concentrations in shelf areas of the World Ocean. In water and bottom sediments distribution of HC is determined by discharge of river marginal filters. Here sedimentation of the bulk of anthropogenic HC occurs. That is why a grain-size controlling factor is not active in the zone of the river depocenter (in particular, of the North Dvina River). The same reasons most probably may explain differences in degree of geochemical relationships between contents of TOC and HC in suspended matter and bottom sediments. After passing through marginal filters natural HC are dominant in all migration forms.

本数据集收录了白海水体、悬浮物（采用裘迪网（Juday net）与分流器采集）及底沉积物中脂肪烃与多环芳烃（HC）的浓度与组成数据。研究表明，近年间白海水体中脂肪烃的浓度水平（平均18 µg/L）基本保持稳定，且与全球海洋陆架区的平均浓度水平相当。水体与底沉积物中烃类的分布格局受河流边缘滤层的径流输入过程调控，在此区域绝大多数人为源烃类发生沉降富集。正因如此，粒度控制因子在河流沉积中心（尤其是北德维纳河沉积中心）区域并未发挥调控作用。上述成因或可解释悬浮物与底沉积物中总有机碳（Total Organic Carbon, TOC）与烃类含量间地球化学关联程度的差异。经河流边缘滤层后，自然源烃类在所有迁移形态中占据主导地位。