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Title: Evolution of Multispectral Aerosol Absorption Properties in a Biogenically-Influenced Urban Environment during the CARES Campaign

Abstract

We present the evolution of multispectral optical properties through urban aerosols that have aged and interacted with biogenic emissions, resulting in stronger short wavelength absorption and the formation of moderately brown secondary organic aerosols. Ground-based aerosol measurements were made in June 2010 within the Sacramento urban area (site T0) and at a 40-km downwind location (site T1) in the forested Sierra Nevada foothills area. Data on black carbon (BC) and non-refractory aerosol mass and composition were collected at both sites. In addition, photoacoustic (PA) instruments with integrating nephelometers were used to measure spectral absorption and scattering coefficients for wavelengths ranging from 355 to 870 nm. The daytime absorption Ångström exponent (AAE) indicated a modest wavelength-dependent enhancement of absorption at both sites throughout the study. From 22 to 28 June 2010, secondary organic aerosol mass increased significantly at both sites, which was due to increased biogenic emissions coupled with intense photochemical activity and air mass recirculation in the area. During this period, the median BC mass-normalized absorption cross-section (MAC) values for 405 nm and 532 nm at T1 increased by ~23% and ~35%, respectively, compared with the relatively less aged urban emissions at the T0 site. In contrast, the average MACmore » values for the 870 nm wavelength were similar for both sites. Furthermore, these results suggest the formation of moderately brown secondary organic aerosols in biogenically-influenced urban air.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11];  [12];  [13]
  1. Univ. of Nevada, Reno, NV (United States). Physics Dept.; Desert Research Inst. (DRI), Reno, NV (United States). Lab. for Aerosol Science, Spectroscopy, and Optics; San Jacinto College, Houston, TX (United States)
  2. Univ. of Nevada, Reno, NV (United States). Physics Dept.
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Atmospheric Sciences & Global Change Division
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Atmospheric Sciences & Global Change Division; RAI Innovations Co., Winston-Salem, NC (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); AECOM, Houston, TX (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  7. Univ. of California, Davis, CA (United States). Dept. of Environmental Toxicology; Lab. for Advanced Analytical Technologies, Dubendorf (Switzerland)
  8. Univ. of California, Davis, CA (United States). Dept. of Environmental Toxicology
  9. Michigan Technological Univ., Houghton, MI (United States). Atmospheric Science Program; Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab.
  10. Michigan Technological Univ., Houghton, MI (United States). Atmospheric Science Program
  11. Michigan Technological Univ., Houghton, MI (United States). Atmospheric Science Program; Carnegie Mellon Univ., Pittsburgh, PA (United States). Center for Atmospheric Particle Studies
  12. Droplet Measurements Technologies, Boulder, CO (United States)
  13. Desert Research Inst. (DRI), Reno, NV (United States). Lab. for Aerosol Science, Spectroscopy, and Optics
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, Davis, CA (United States); Desert Research Inst. (DRI), Reno, NV (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); National Aeronautic and Space Administration (NASA); USDOE Office of Science (SC). Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1430721
Alternate Identifier(s):
OSTI ID: 1463570
Report Number(s):
PNNL-SA-126576; LA-UR-18-26272
Journal ID: ISSN 2073-4433; PII: atmos8110217
Grant/Contract Number:  
AC05-76RL01830; FG02-11ER65293; NNX10AR89A; NNX15AI48G; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Atmosphere (Basel)
Additional Journal Information:
Journal Name: Atmosphere (Basel); Journal Volume: 8; Journal Issue: 11; Journal ID: ISSN 2073-4433
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; aerosol optical properties; photoacoustic instruments; absorption Ångström exponent (AAE); mass absorption cross-section (MAC); secondary organic carbon (SOA); brown carbon (BrC); photochemical ageing; anthropogenic emissions; biogenic emissions; Earth Sciences; aerosols, climate, optical properties, SOA, biogenic, anthropogenic

Citation Formats

Gyawali, Madhu, Arnott, W., Zaveri, Rahul, Song, Chen, Flowers, Bradley, Dubey, Manvendra, Setyan, Ari, Zhang, Qi, China, Swarup, Mazzoleni, Claudio, Gorkowski, Kyle, Subramanian, R., and Moosmuller, Hans. Evolution of Multispectral Aerosol Absorption Properties in a Biogenically-Influenced Urban Environment during the CARES Campaign. United States: N. p., 2017. Web. doi:10.3390/ATMOS8110217.
Gyawali, Madhu, Arnott, W., Zaveri, Rahul, Song, Chen, Flowers, Bradley, Dubey, Manvendra, Setyan, Ari, Zhang, Qi, China, Swarup, Mazzoleni, Claudio, Gorkowski, Kyle, Subramanian, R., & Moosmuller, Hans. Evolution of Multispectral Aerosol Absorption Properties in a Biogenically-Influenced Urban Environment during the CARES Campaign. United States. doi:10.3390/ATMOS8110217.
Gyawali, Madhu, Arnott, W., Zaveri, Rahul, Song, Chen, Flowers, Bradley, Dubey, Manvendra, Setyan, Ari, Zhang, Qi, China, Swarup, Mazzoleni, Claudio, Gorkowski, Kyle, Subramanian, R., and Moosmuller, Hans. Mon . "Evolution of Multispectral Aerosol Absorption Properties in a Biogenically-Influenced Urban Environment during the CARES Campaign". United States. doi:10.3390/ATMOS8110217. https://www.osti.gov/servlets/purl/1430721.
@article{osti_1430721,
title = {Evolution of Multispectral Aerosol Absorption Properties in a Biogenically-Influenced Urban Environment during the CARES Campaign},
author = {Gyawali, Madhu and Arnott, W. and Zaveri, Rahul and Song, Chen and Flowers, Bradley and Dubey, Manvendra and Setyan, Ari and Zhang, Qi and China, Swarup and Mazzoleni, Claudio and Gorkowski, Kyle and Subramanian, R. and Moosmuller, Hans},
abstractNote = {We present the evolution of multispectral optical properties through urban aerosols that have aged and interacted with biogenic emissions, resulting in stronger short wavelength absorption and the formation of moderately brown secondary organic aerosols. Ground-based aerosol measurements were made in June 2010 within the Sacramento urban area (site T0) and at a 40-km downwind location (site T1) in the forested Sierra Nevada foothills area. Data on black carbon (BC) and non-refractory aerosol mass and composition were collected at both sites. In addition, photoacoustic (PA) instruments with integrating nephelometers were used to measure spectral absorption and scattering coefficients for wavelengths ranging from 355 to 870 nm. The daytime absorption Ångström exponent (AAE) indicated a modest wavelength-dependent enhancement of absorption at both sites throughout the study. From 22 to 28 June 2010, secondary organic aerosol mass increased significantly at both sites, which was due to increased biogenic emissions coupled with intense photochemical activity and air mass recirculation in the area. During this period, the median BC mass-normalized absorption cross-section (MAC) values for 405 nm and 532 nm at T1 increased by ~23% and ~35%, respectively, compared with the relatively less aged urban emissions at the T0 site. In contrast, the average MAC values for the 870 nm wavelength were similar for both sites. Furthermore, these results suggest the formation of moderately brown secondary organic aerosols in biogenically-influenced urban air.},
doi = {10.3390/ATMOS8110217},
journal = {Atmosphere (Basel)},
number = 11,
volume = 8,
place = {United States},
year = {2017},
month = {11}
}

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