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Title: Atmospheric fungal nanoparticle bursts

Abstract

Aerosol nanoparticles play an important role in the climate system by affecting cloud formation and properties, as well as in human health because of their deep reach into lungs and the circulatory system. Determining nanoparticle sources and composition is a major challenge in assessing their impacts in these areas. The sudden appearance of large numbers of atmospheric nanoparticles is commonly attributed to secondary formation from gas-phase precursors, but in many cases, the evidence for this is equivocal. We report the detection of a mode of fungal fragments with a mobility diameter of roughly 30 nm released in episodic bursts in ambient air over an agricultural area in northern Oklahoma. These events reached concentrations orders of magnitude higher than other reports of biological particles and show similarities to unclarified events reported previously in the Amazon. These particles potentially represent a large source of both cloud-forming ice nuclei and respirable allergens in a variety of ecosystems.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]
+ Show Author Affiliations
  1. Univ. of California, Irvine, CA (United States). Dept. of Chemistry
Publication Date:
Research Org.:
Univ. of California, Irvine, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1626032
Grant/Contract Number:  
SC0014469; SC0019000
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 3; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Science & Technology - Other Topics

Citation Formats

Lawler, Michael J., Draper, Danielle C., and Smith, James N. Atmospheric fungal nanoparticle bursts. United States: N. p., 2020. Web. doi:10.1126/sciadv.aax9051.
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Lawler, Michael J., Draper, Danielle C., & Smith, James N. Atmospheric fungal nanoparticle bursts. United States. https://doi.org/10.1126/sciadv.aax9051
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Lawler, Michael J., Draper, Danielle C., and Smith, James N. Wed . "Atmospheric fungal nanoparticle bursts". United States. https://doi.org/10.1126/sciadv.aax9051. https://www.osti.gov/servlets/purl/1626032.
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@article{osti_1626032,
title = {Atmospheric fungal nanoparticle bursts},
author = {Lawler, Michael J. and Draper, Danielle C. and Smith, James N.},
abstractNote = {Aerosol nanoparticles play an important role in the climate system by affecting cloud formation and properties, as well as in human health because of their deep reach into lungs and the circulatory system. Determining nanoparticle sources and composition is a major challenge in assessing their impacts in these areas. The sudden appearance of large numbers of atmospheric nanoparticles is commonly attributed to secondary formation from gas-phase precursors, but in many cases, the evidence for this is equivocal. We report the detection of a mode of fungal fragments with a mobility diameter of roughly 30 nm released in episodic bursts in ambient air over an agricultural area in northern Oklahoma. These events reached concentrations orders of magnitude higher than other reports of biological particles and show similarities to unclarified events reported previously in the Amazon. These particles potentially represent a large source of both cloud-forming ice nuclei and respirable allergens in a variety of ecosystems.},
doi = {10.1126/sciadv.aax9051},
journal = {Science Advances},
number = 3,
volume = 6,
place = {United States},
year = {2020},
month = {1}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1126/sciadv.aax9051
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Figures / Tables:

Fig. 1 Fig. 1: Aerosol size distributions and nanoparticle composition for a characteristic fungal nanoparticle event. (A) Scanning mobility particle sizer (SMPS) number distribution time series of 10- to 500-nm aerosol on 15 September 2016. The time and particle size over two consecutive positive mode TDCIMS nanoparticle collections are indicated by roundedmore » rectangles. The second collection encompassed a fungal nanoparticle event. Rain rate is indicated by black crosses. (B) Averaged SMPS size distributions over these two periods. (C) Positive ion mode mass spectrum of the composition of particles collected during the event period from (A) and (B). Only detectable peaks are plotted. None of the plotted peaks were detectable during the non-event period. Colors indicate the timing of the peaks during the filament temperature ramp. Orange and red colors indicate the products of the pyrolytic breakdown of larger molecules, including polymers such as chitin. Cooler colors (blue) indicate molecules, which likely desorbed intact. Molecular formulas consistent with chitin pyrolysis products and desorbed sugars are indicated.« less
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