Physicochemical Forms of Biogenic Elements in Atmospheric Precipitations
摘要
Atmospheric precipitation is a significant external source of biogenic elements (nitrogen, phosphorus, iron, silicon) for marine areas, especially for those remote from continental runoff. These elements play a vital role in maintaining biological productivity and the functioning of marine natural systems. They enter marine ecosystems with atmospheric precipitation in various physicochemical forms, which determines bioavailability, reactivity, and potential environmental impact. It was revealed that the nature of the entry of biogenic elements correlates with their physicochemical form and depends on the source and properties of the compounds of biogenic elements. Easily soluble nitrogen compounds (in the form of nitrates and ammonium) enter with atmospheric precipitation more uniformly throughout the year; the changes in the volume of their entry are associated with the uneven action of pollution sources that supply nitrogen in the form of nitrogen oxides and ammonia. The entry of phosphorus and silicon (in the form of phosphates and silicates) is mostly due to dust transport and therefore has a more uneven, peak-like character.