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Title: Measuring mass-based hygroscopicity of atmospheric particles through in situ imaging

Journal Article · · Environmental Science and Technology
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [7];  [8];  [9]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Stanford Univ., Stanford, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Carl Zeiss X-ray Microscopy, Inc., Pleasanton, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  4. North Carolina State Univ., Raleigh, NC (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  6. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Xiamen Univ., Xiamen (China)
  7. Atmospheric Radiation Monitoring (Southern Great Plains Climate Research Facility), Billings, OK (United States)
  8. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  9. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

© 2016 American Chemical Society. Quantifying how atmospheric particles interact with water vapor is critical for understanding the effects of aerosols on climate. We present a novel method to measure the mass-based hygroscopicity of particles while characterizing their elemental and carbon functional group compositions. Since mass-based hygroscopicity is insensitive to particle geometry, it is advantageous for probing the hygroscopic behavior of atmospheric particles, which can have irregular morphologies. Combining scanning electron microscopy with energy dispersive X-ray analysis (SEM/EDX), scanning transmission X-ray microscopy (STXM) analysis, and in situ STXM humidification experiments, this method was validated using laboratory-generated, atmospherically relevant particles. Then, the hygroscopicity and elemental composition of 15 complex atmospheric particles were analyzed by leveraging quantification of C, N, and O from STXM, and complementary elemental quantification from SEM/EDX. We found three types of hygroscopic responses, and correlated high hygroscopicity with Na and Cl content. The mixing state of 158 other particles from the sample broadly agreed with those of the humidified particles, indicating the potential to infer atmospheric hygroscopic behavior from a selected subset of particles. These methods offer unique quantitative capabilities to characterize and correlate the hygroscopicity and chemistry of individual submicrometer atmospheric particles.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; AC06-76RL01830
OSTI ID:
1311629
Alternate ID(s):
OSTI ID: 1379343
Report Number(s):
LBNL-1005926; ir:1005926
Journal Information:
Environmental Science and Technology, Vol. 50, Issue 10; ISSN 0013-936X
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (5)

Quantitative capabilities of STXM to measure spatially resolved organic volume fractions of mixed organic ∕ inorganic particles journal January 2019
The effect of hydrophobic glassy organic material on the cloud condensation nuclei activity of particles with different morphologies journal January 2019
Anthropogenic influences on the physical state of submicron particulate matter over a tropical forest journal January 2017
A review of experimental techniques for aerosol hygroscopicity studies journal January 2019
Fungal spores as a source of sodium salt particles in the Amazon basin journal November 2018