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Title: Airborne Aerosol in Situ Measurements during TCAP: A Closure Study of Total Scattering

Journal Article · · Atmosphere (Basel)
DOI:https://doi.org/10.3390/atmos6081069· OSTI ID:1209863
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. University of Nevada, Reno, NV (United States)
  3. Brookhaven National Laboratory, Upton, NY (United States)
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We present here a framework for calculating the total scattering of both non-absorbing and absorbing aerosol at ambient conditions from aircraft data. The synergistically employed aircraft data involve aerosol microphysical, chemical, and optical components and ambient relative humidity measurements. Our framework is developed emphasizing the explicit use of the complementary chemical composition data for estimating the complex refractive index (RI) of particles, and thus obtaining improved ambient size spectra derived from Optical Particle Counter (OPC) measurements. The feasibility of our framework for improved calculations of total aerosol scattering is demonstrated for different ambient conditions with a wide range of relative humidities (from 5 to 80%) using three types of data collected by the U.S. Department of Energy (DOE) G-1 aircraft during the recent Two-Column Aerosol Project (TCAP). Namely, these three types of data employed are: (1) size distributions measured by an Ultra High Sensitivity Aerosol Spectrometer (UHSAS; 0.06-1 µm), a Passive Cavity Aerosol Spectrometer (PCASP; 0.1-3 µm) and a Cloud and Aerosol Spectrometer (CAS; 0.6- >10 µm), (2) chemical composition data measured by an Aerosol Mass Spectrometer (AMS; 0.06-0.6 µm) and a Single Particle Soot Photometer (SP2; 0.06-0.6 µm), and (3) the dry total scattering coefficient measured by a TSI integrating nephelometer at three wavelengths (0.45, 0.55, 0.7 µm) and scattering enhancement factor measured with a humidification system at three RHs (near 45%, 65% and 90%) at a single wavelength (0.525 µm). We demonstrate that good agreement (~10% on average) between the observed and calculated scattering at these three wavelengths can be obtained using the best available chemical composition data for the RI-based correction of the OPC-derived size spectra. We also demonstrate that ignoring the RI-based correction and using non-representative RI values can cause a substantial underestimation (~40% on average) and overestimation (~35% on average) of the calculated total scattering, respectively.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Secretary of Energy (S)
Grant/Contract Number:
AC05-76RL01830; SC00112704
OSTI ID:
1209863
Alternate ID(s):
OSTI ID: 1213372
Report Number(s):
PNNL-SA-110601; BNL-108230-2015-JA; ATMOCZ; KP1701000
Journal Information:
Atmosphere (Basel), Vol. 6, Issue 8; ISSN 2073-4433
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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Cited By (6)

A practical set of miniaturized instruments for vertical profiling of aerosol physical properties journal March 2017
The influence of local oil exploration and regional wildfires on summer 2015 aerosol over the North Slope of Alaska journal January 2018
Modification, calibration, and performance of the Ultra-High Sensitivity Aerosol Spectrometer for particle size distribution and volatility measurements during the Atmospheric Tomography Mission (ATom) airborne campaign journal January 2018
A Closure Study of Total Scattering Using Airborne In Situ Measurements from the Winter Phase of TCAP journal June 2018
The observed influence of local anthropogenic pollution on northern Alaskan cloud properties journal January 2017
The CU 2D-MAX-DOAS instrument - part 2: Raman Scattering Probability Measurements and Retrieval of Aerosol Optical Properties posted_content January 2016

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Related Subjects

54 ENVIRONMENTAL SCIENCES
14 SOLAR ENERGY
aircraft measurements of aerosol microphysical, chemical, and optical components and ambient relative humidity
Ultra-High Sensitivity Aerosol Spectrometer (UHSAS)
Passive Cavity Aerosol Spectrometer (PCASP)
Cloud and Aerosol Spectrometer (CAS)
Aerosol Mass Spectrometer (AMS)
Single Particle Soot Photometer (SP2)
integrating nephelometer
humidification system
Two-Column Aerosol Project (TCAP)