Study Finds Wildfire Smoke Turns Rain into Nutrient-Rich Fertilizer Across Utah
Researchers discovered that when rain mixes with wildfire smoke in Utah, it deposits significant amounts of nitrogen, phosphorus and potassium, effectively fertilizing ecosystems.
Scientists from the University of Utah, Utah State University and the Cary Institute of Ecosystem Studies analyzed climate-site data and satellite observations to assess how rain interacting with wildfire smoke delivers nutrients to land and water. Their findings, published in Global Change Biology, show that smoky rain episodes, while comprising roughly 5% of days, account for 20% to 30% of the yearly input of nitrogen, phosphorus and potassium via rain.
The frequency of these events rose in 2022 compared with earlier years, a trend the authors associate with the growing scale of global wildfires. Regional hotspots shifted over time, with the Upper Midwest remaining a consistent source of smoke-affected deposition. The researchers caution that the ecological impact—whether it boosts growth in nutrient-poor areas or fuels problems like algal blooms—remains uncertain and warrants further investigation.
Why it matters
Understanding smoke-laden rain helps predict how increasing wildfires may alter nutrient cycles and ecosystem health.
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