期刊
NATURE GEOSCIENCE
卷 9, 期 6, 页码 433-+出版社
NATURE PORTFOLIO
DOI: 10.1038/NGEO2705
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资金
- Chemical Imaging Initiative of the Laboratory Directed Research and Development Program at PNNL
- US Department of Energy's Atmospheric System Research Program, an Office of Science, Office of Biological and Environmental Research (OBER)
- OBER at PNNL
- US Department of Energy [DE-AC06-76RL0]
- Office of Science, Office of Basic Energy Sciences of the US Department of Energy [DE-AC02-05CH11231]
- Office of Basic Energy Sciences Division of Chemical Sciences, Geosciences, and Biosciences by the Condensed Phase and Interfacial Molecular Sciences Program of the US Department of Energy
- Canada Foundation for Innovation
- Natural Sciences and Engineering Research Council of Canada
- Government of Saskatchewan
- Western Economic Diversification Canada
- National Research Council Canada
- Canadian Institutes of Health Research
- University of Saskatchewan
Airborne organic particles play a critical role in Earth's climate(1), public health(2), air quality(3), and hydrological and carbon cycles(4). However, sources and formation mechanisms for semi-solid and solid organic particles(5) are poorly understood and typically neglected in atmospheric models(6). Laboratory evidence suggests that fine particles can be formed from impaction of mineral surfaces by droplets(7). Here, we use chemical imaging of particles collected following rain events in the Southern Great Plains, Oklahoma, USA and after experimental irrigation to show that raindrop impaction of soils generates solid organic particles. We find that after rain events, sub-micrometre solid particles, with a chemical composition consistent with soil organic matter, contributed up to 60% of atmospheric particles. Our irrigation experiments indicate that intensive water impaction is suffcient to cause ejection of airborne soil organic particles from the soil surface. Chemical imaging and micro-spectroscopy analysis of particle physico-chemical properties suggest that these particles may have important impacts on cloud formation and efficiently absorb solar radiation. We suggest that raindrop induced formation of solid organic particles from soils may be a widespread phenomenon in ecosystems such as agricultural systems and grasslands where soils are exposed to strong, episodic precipitation events(8).
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