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Title: Airborne soil organic particles generated by precipitation

Journal Article · · Nature Geoscience
DOI:https://doi.org/10.1038/ngeo2705· OSTI ID:1251637
 [1];  [2];  [3];  [3];  [1];  [1];  [4];  [1];  [3];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Univ. of Massachusetts, Amherst, MA (United States)

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.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-76RL01830; AC02-05CH11231
OSTI ID:
1251637
Alternate ID(s):
OSTI ID: 1379365
Report Number(s):
PNNL-SA-110735; ngeo2705
Journal Information:
Nature Geoscience, Vol. 151, Issue 2; ISSN 1752-0894
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 58 works
Citation information provided by
Web of Science

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Cited By (15)

Forest Floor Leaf Cover as a Barrier for Dust Accumulation in Tai National Park: Implications for Primate Dental Wear Studies journal August 2018
Climate Feedback on Aerosol Emission and Atmospheric Concentrations journal January 2018
Physical Properties of Aerosol Internally Mixed With Soot Particles in a Biogenically Dominated Environment in California journal October 2018
Bioaerosol generation by raindrops on soil journal March 2017
The viscosity of atmospherically relevant organic particles journal March 2018
Glacially sourced dust as a potentially significant source of ice nucleating particles journal March 2019
Perspective: Aerosol microphysics: From molecules to the chemical physics of aerosols journal December 2017
Spherical tarball particles form through rapid chemical and physical changes of organic matter in biomass-burning smoke journal September 2019
Volume changes upon heating of aerosol particles from biomass burning using transmission electron microscopy journal September 2017
Bioaerosol field measurements: Challenges and perspectives in outdoor studies journal November 2019
Seasonal changes of airborne bacterial communities over Tokyo and influence of local meteorology journal February 2019
Atmospheric fungal nanoparticle bursts journal January 2020
Seasonal Changes of Airborne Bacterial Communities Over Tokyo and Influence of Local Meteorology journal July 2019
Anthropogenic influences on the physical state of submicron particulate matter over a tropical forest journal January 2017
Single-particle characterization of aerosols collected at a remote site in the Amazonian rainforest and an urban site in Manaus, Brazil journal January 2019

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