globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2705
论文题名:
Airborne soil organic particles generated by precipitation
作者: Wang B.; Harder T.H.; Kelly S.T.; Piens D.S.; China S.; Kovarik L.; Keiluweit M.; Arey B.W.; Gilles M.K.; Laskin A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期:6
起始页码: 433
结束页码: 437
语种: 英语
Scopus关键词: aerosol formation ; airborne survey ; atmospheric particle ; chemical composition ; physicochemical property ; precipitation (climatology) ; raindrop ; soil organic matter ; solar radiation ; Great Plains ; Oklahoma [United States] ; United States
英文摘要: Airborne organic particles play a critical role in Earth's climate, public health, air quality, and hydrological and carbon cycles. However, sources and formation mechanisms for semi-solid and solid organic particles are poorly understood and typically neglected in atmospheric models. Laboratory evidence suggests that fine particles can be formed from impaction of mineral surfaces by droplets. 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 sufficient 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. © 2016 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105991
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, United States; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Department of Chemistry, University of California, Berkeley, CA, United States; Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, United States; State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China; Carl Zeiss X-ray Microscopy Inc., Pleasanton, CA, United States

Recommended Citation:
Wang B.,Harder T.H.,Kelly S.T.,et al. Airborne soil organic particles generated by precipitation[J]. Nature Geoscience,2016-01-01,9(6)
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