Understanding the Origin of Wet Deposition Black Carbon in North America During the Fall Season

Environments, Journal Year: 2025, Volume and Issue: 12(2), P. 58 - 58

Published: Feb. 10, 2025

Black carbon (BC) aerosols emitted from biomass, fossil fuel, and waste combustion contribute to the radiation budget imbalance are transported over extensive distances in Earth’s atmosphere. These undergo physical chemical modifications with co-existing (e.g., nitrate, sulfate, ammonium) through aging processes during long-range transport primarily removed troposphere by wet deposition. Using precipitation samples collected North America between 26 October 1 December 2020 National Atmospheric Deposition Program (NADP), we investigated relationships BC both water-soluble ions organic (WSOC) using Spearman’s rank coefficients. We then attempted identify sources of deposition factor analysis (FA) satellite data fire smoke. showed a very strong correlation nitrate (ρ = 0.83). Strong correlations were also found WSOC, ammonium, calcium, sulfate 0.78, 0.74, 0.67, respectively). FA that was same as indicating could originate secondary aerosol formation biomass burning. Supported smoke, other correlated pollutants believed be associated wildfire outbreaks several states United States (US) November 2020.

Language: Английский

Seasonal and Climatic Drivers of Wet Deposition Organic Matter at the Continental Scale

Journal of Geophysical Research Biogeosciences, Journal Year: 2024, Volume and Issue: 129(11)

Published: Oct. 29, 2024

Abstract Dissolved organic matter (DOM) concentrations and composition within wet deposition are rarely monitored despite contributing a large input of bioavailable dissolved carbon (DOC) nitrogen (DON) to the Earth's surface. Lacking from literature spatially comprehensive assessments simultaneous measurements DOC DON chemistry their dependencies on metrics climate environmental factors. Here, we use archived precipitation samples US National Atmospheric Deposition Program collected in 2017 2018 17 sites across six ecoregions investigate variability concentration depositional DOM. We hypothesize DOM vary with ecoregion, season, large‐scale drivers, geographic source. Findings indicate differences loads among ecoregions. The highest Northern Forests lowest Marine West Coast Forests. Summer autumn contained that were consistently above detection limit, corresponding seasonality peak air temperatures phenology growing season northern hemisphere. Compositional trends suggest lighter molecules winter heavier spring summer. Climate drivers explain 51% variation chemistry, revealing differing versus deposition. This study highlights necessity incorporating into national monitoring networks understand spatial temporal feedbacks between change, atmospheric landscape biogeochemistry.

Language: Английский