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Title: Absorption/transmission measurements of PSAP particle-laden filters from the Biomass Burning Observation Project (BBOP) field campaign

Journal Article · · Aerosol Science and Technology
 [1];  [1];  [1];  [2];  [3];  [4]
  1. National Institute of Standards and Technology, Gaithersburg, MD (United States)
  2. National Institute of Standards and Technology, Gaithersburg, MD (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
+ Show Author Affiliations

Absorptivity measurements with a laser-heating approach, referred to as the laser-driven thermal reactor (LDTR), were carried out in the infrared and applied at ambient (laboratory) non-reacting conditions to particle-laden filters from a three-wavelength (visible) particle/soot absorption photometer (PSAP). The particles were obtained during the Biomass Burning Observation Project (BBOP) field campaign. The focus of this study was to determine the particle absorption coefficient from field-campaign filter samples using the LDTR approach, and compare results with other commercially available instrumentation (in this case with the PSAP, which has been compared with numerous other optical techniques). Advantages of the LDTR approach include 1) direct determination of material absorption, 2) information on the filter optical properties, and 3) identification of the filter material effects on particle absorption (e.g., leading to particle absorption enhancement or shadowing). For measurements carried out under ambient conditions, the particle absorptivity is obtained with a thermocouple placed flush with the filter back surface and the laser probe beam impinging normal to the filter particle-laden surface. Thus, in principle one can employ a simple experimental arrangement to measure simultaneously both the transmissivity and absorptivity (at different discrete wavelengths) and ascertain the particle absorption coefficient. For this investigation, LDTR measurements were carried out with PSAP filters (pairs with both blank and exposed filters) from eight different days during the campaign, having relatively light but different particle loadings. The observed particles coating the filters were found to be carbonaceous (having broadband absorption characteristics). The LDTR absorbance compared well with results from both the PSAP. The analysis was also expanded to account for the filter fiber scattering on particle absorption in assessing particle absorption enhancement and shadowing effects. The results indicated that absorption enhancement effects were significant, and diminished with increased filter particle loading.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0012704; AC05-76RL01830
OSTI ID:
1337650
Alternate ID(s):
OSTI ID: 1353330
Report Number(s):
BNL-113301-2016-JA; PNNL-SA-120853; R&D Project: 2016-BNL-EE630EECA-Budg; KP1701000
Journal Information:
Aerosol Science and Technology, Vol. 51, Issue 4; ISSN 0278-6826
Publisher:
American Association for Aerosol ResearchCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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Cited By (6)

Volume changes upon heating of aerosol particles from biomass burning using transmission electron microscopy journal September 2017
Simultaneous transmission and absorption photometry of carbon-black absorption from drop-cast particle-laden filters journal March 2019
An intercomparison of aerosol absorption measurements conducted during the SEAC4RS campaign text January 2018
An intercomparison of aerosol absorption measurements conducted during the SEAC 4 RS campaign journal August 2018
Simultaneous Transmission and Absorption Photometry of Carbon-Black Absorption from Drop-Cast Particle-Laden Filters text January 2019
Simultaneous transmission and absorption photometry of carbon-black absorption from drop-cast particle-laden filters text January 2020

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54 ENVIRONMENTAL SCIENCES
absorption coeffcient
Biomass Burning Observation Project
laser-driven thermal reactor
particle/soot absorption photometer
particle absorption
particle-laden filters