Evolution of Multispectral Aerosol Absorption Properties in a Biogenically-Influenced Urban Environment during the CARES Campaign
- 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)
- Univ. of Nevada, Reno, NV (United States). Physics Dept.
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Atmospheric Sciences & Global Change Division
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Atmospheric Sciences & Global Change Division; RAI Innovations Co., Winston-Salem, NC (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); AECOM, Houston, TX (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of California, Davis, CA (United States). Dept. of Environmental Toxicology; Lab. for Advanced Analytical Technologies, Dubendorf (Switzerland)
- Univ. of California, Davis, CA (United States). Dept. of Environmental Toxicology
- Michigan Technological Univ., Houghton, MI (United States). Atmospheric Science Program; Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab.
- Michigan Technological Univ., Houghton, MI (United States). Atmospheric Science Program
- Michigan Technological Univ., Houghton, MI (United States). Atmospheric Science Program; Carnegie Mellon Univ., Pittsburgh, PA (United States). Center for Atmospheric Particle Studies
- Droplet Measurements Technologies, Boulder, CO (United States)
- Desert Research Inst. (DRI), Reno, NV (United States). Lab. for Aerosol Science, Spectroscopy, and Optics
We present the evolution of multispectral optical properties as urban aerosols aged and interacted with biogenic emissions resulting in stronger short wavelength absorption and formation of moderately brown secondary organic aerosols. Ground-based aerosol measurements were made during 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 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 the 22nd to the 28th of June, secondary organic aerosol mass increased significantly at both sites 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 to 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. These results suggest formation of moderately brown secondary organic aerosols in biogenically-influenced urban air.
- Research Organization:
- 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 Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); National Aeronautics and Space Administration (NASA); USDOE Office of Science (SC). Biological and Environmental Research (BER) (SC-23)
- Grant/Contract Number:
- AC05-76RL01830; FG02-11ER65293; NNX10AR89A; NNX15AI48G; AC52-06NA25396
- OSTI ID:
- 1430721
- Alternate ID(s):
- OSTI ID: 1463570; OSTI ID: 1729858
- Report Number(s):
- PNNL-SA-126576; LA-UR-18-26272; PII: atmos8110217
- Journal Information:
- Atmosphere (Basel), Vol. 8, Issue 11; ISSN 2073-4433
- Publisher:
- MDPICopyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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