Aerosol size distributions during the Atmospheric Tomography Mission (ATom): methods, uncertainties, and data products
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Published:2019-06-06
Issue:6
Volume:12
Page:3081-3099
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Brock Charles A.ORCID, Williamson Christina, Kupc AgnieszkaORCID, Froyd Karl D., Erdesz Frank, Wagner Nicholas, Richardson Matthews, Schwarz Joshua P.ORCID, Gao Ru-Shan, Katich Joseph M., Campuzano-Jost PedroORCID, Nault Benjamin A.ORCID, Schroder Jason C., Jimenez Jose L.ORCID, Weinzierl BernadettORCID, Dollner MaximilianORCID, Bui ThaoPaul, Murphy Daniel M.
Abstract
Abstract. From 2016 to 2018 a DC-8 aircraft operated by the US National
Aeronautics and Space Administration (NASA) made four series of flights,
profiling the atmosphere from 180 m to ∼12 km above sea level (km a.s.l.)
from the Arctic to the Antarctic over both the Pacific and Atlantic oceans.
This program, the Atmospheric Tomography Mission (ATom), sought to sample
the troposphere in a representative manner, making measurements of
atmospheric composition in each season. This paper describes the
aerosol microphysical measurements and derived quantities obtained during
this mission. Dry size distributions from 2.7 nm to 4.8 µm in
diameter were measured in situ at 1 Hz using a battery of instruments: 10
condensation particle counters with different nucleation diameters, two
ultra-high-sensitivity aerosol size spectrometers (UHSASs), one of which
measured particles surviving heating to 300 ∘C, and a laser
aerosol spectrometer (LAS). The dry aerosol measurements were complemented
by size distribution measurements from 0.5 to 930 µm diameter at
near-ambient conditions using a cloud, aerosol, and precipitation
spectrometer (CAPS) mounted under the wing of the DC-8. Dry aerosol number,
surface area, and volume, and optical scattering and asymmetry parameters at
several wavelengths from the near-UV to the near-IR ranges were calculated from the
measured dry size distributions (2.7 nm to 4.8 µm). Dry aerosol mass
was estimated by combining the size distribution data with particle density
estimated from independent measurements of aerosol composition with a
high-resolution aerosol mass spectrometer and a single-particle soot
photometer. We describe the instrumentation and fully document the aircraft
inlet and flow distribution system, the derivation of uncertainties, and the
calculation of data products from combined size distributions. Comparisons
between the instruments and direct measurements of some aerosol properties
confirm that in-flight performance was consistent with calibrations and
within stated uncertainties for the two deployments analyzed. The unique
ATom dataset contains accurate, precise, high-resolution in situ
measurements of dry aerosol size distributions, and integral parameters, and
estimates and measurements of optical properties, for particles < 4.8 µm in diameter that can be used to evaluate aerosol abundance and
processes in global models.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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