Weatherwatch: Saharan dust drops microorganisms into European soil

Saharan dust events, which are intensifying and depositing thousands of tonnes of sand across Europe, are carrying a significant load of microorganisms into European soils. Scientists are investigating the potential impact of these imported microbes on soil health, agricultural fertility, and crop yields, with a particular focus on vineyards in southern Portugal, a region situated along a primary Saharan dust deposition route. A research team from the University of Lisbon conducted genomic mapping of microbes found in dust samples collected during Storm Celia in March 2022. This research aims to understand how these non-native microorganisms might alter the existing soil microbiome. The phenomenon of "blood rain," characterized by visible red streaks caused by the dust, highlights the substantial quantities of material being transported. While generally considered harmless, the biological component of this dust is a growing area of scientific concern for agricultural sustainability.