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Title: Two-Column Aerosol Project: Aerosol Light Extinction Measurements Field Campaign Report

Abstract

We deployed Aerodyne Research Inc.’s first Cavity Attenuated Phase Shift extinction (CAPS PMex) monitor (built by Aerodyne) that measures light extinction by using a visible-light-emitting diode (LED) as a light source, a sample cell incorporating two high-reflectivity mirrors centered at the wavelength of the LED, and a vacuum photodiode detector in Cape Cod in 2012/13 for the U.S. Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Climate Research Facility’s Two-Column Aerosol Project (TCAP). The efficacy of this instrument is based on the fact that aerosols are broadband scatterers and absorbers of light. The input LED is square-wave modulated and passed through the sample cell that distorts it due to exponential decay by aerosol light absorption and scattering; this is measured at the detector. The amount of phase shift of the light at the detector is used to determine the light extinction. This extinction measurement provides an absolute value, requiring no calibration. The goal was to compare the CAPS performance with direct measurements of absorption with ARM’s baseline photoacoustic soot spectrometer (PASS-3) and nephelometer instruments to evaluate its performance.

Authors:
 [1];  [1];  [2];  [3];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Aerodyne Research, Inc., Billerica, MA (United States)
Publication Date:
Research Org.:
DOE Office of Science Atmospheric Radiation Measurement (ARM) Program (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1324987
Report Number(s):
DOE/SC-ARM-16-047
DOE Contract Number:
AC05-7601830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Two-Column Aerosol Project, aerosols, photoacoustic soot spectrometer

Citation Formats

Dubey, Manvendra, Aiken, Allison, Berg, Larry, Freedman, Andrew, and Gorkowski, Kyle. Two-Column Aerosol Project: Aerosol Light Extinction Measurements Field Campaign Report. United States: N. p., 2016. Web. doi:10.2172/1324987.
Dubey, Manvendra, Aiken, Allison, Berg, Larry, Freedman, Andrew, & Gorkowski, Kyle. Two-Column Aerosol Project: Aerosol Light Extinction Measurements Field Campaign Report. United States. doi:10.2172/1324987.
Dubey, Manvendra, Aiken, Allison, Berg, Larry, Freedman, Andrew, and Gorkowski, Kyle. Thu . "Two-Column Aerosol Project: Aerosol Light Extinction Measurements Field Campaign Report". United States. doi:10.2172/1324987. https://www.osti.gov/servlets/purl/1324987.
@article{osti_1324987,
title = {Two-Column Aerosol Project: Aerosol Light Extinction Measurements Field Campaign Report},
author = {Dubey, Manvendra and Aiken, Allison and Berg, Larry and Freedman, Andrew and Gorkowski, Kyle},
abstractNote = {We deployed Aerodyne Research Inc.’s first Cavity Attenuated Phase Shift extinction (CAPS PMex) monitor (built by Aerodyne) that measures light extinction by using a visible-light-emitting diode (LED) as a light source, a sample cell incorporating two high-reflectivity mirrors centered at the wavelength of the LED, and a vacuum photodiode detector in Cape Cod in 2012/13 for the U.S. Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Climate Research Facility’s Two-Column Aerosol Project (TCAP). The efficacy of this instrument is based on the fact that aerosols are broadband scatterers and absorbers of light. The input LED is square-wave modulated and passed through the sample cell that distorts it due to exponential decay by aerosol light absorption and scattering; this is measured at the detector. The amount of phase shift of the light at the detector is used to determine the light extinction. This extinction measurement provides an absolute value, requiring no calibration. The goal was to compare the CAPS performance with direct measurements of absorption with ARM’s baseline photoacoustic soot spectrometer (PASS-3) and nephelometer instruments to evaluate its performance.},
doi = {10.2172/1324987},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 2016},
month = {Thu Sep 01 00:00:00 EDT 2016}
}

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