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@ARTICLE{PerimdeFaria:890236,
      author       = {Perim de Faria, Julia and Bundke, Ulrich and Freedman,
                      Andrew and Onasch, Timothy B. and Petzold, Andreas},
      title        = {{L}aboratory {V}alidation and {F}ield {D}eployment of a
                      {C}ompact {S}ingle-{S}cattering {A}lbedo ({SSA}) {M}onitor},
      journal      = {Atmospheric measurement techniques discussions},
      volume       = {146},
      issn         = {1867-8610},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {FZJ-2021-00823},
      pages        = {},
      year         = {2019},
      abstract     = {Abstract. An evaluation of the performance and accuracy of
                      a Cavity Attenuated Phase-Shift Single Scattering Albedo
                      Monitor (CAPS PMssa, Aerodyne Res. Inc.) was conducted in an
                      optical closure study with proven technologies: Cavity
                      Attenuated Phase-Shift Particle Extinction Monitor (CAPS
                      PMex, Aerodyne Res. Inc.); 3-wavelengh Integrating
                      Nephelometer (TSI Model 3563); and 3-wavelength filter-based
                      Particle Soot Absorption Photometer (PSAP, Radiance
                      Research). The evaluation was conducted by connecting the
                      instruments to a controlled aerosol generation system and
                      comparing the measured scattering, extinction, and
                      absorption coefficients measured by the CAPS PMssa with the
                      independent measurements. Three different particle types
                      were used to generate aerosol samples with single-scattering
                      albedos (SSA) ranging from 0.4 to 1.0 at 630 nm wavelength.
                      The CAPS PMssa measurements compared well with the proven
                      technologies. Extinction measurement comparisons exhibited a
                      slope of the linear regression line for the full data set of
                      0.96 $(−0.02/\+0.06),$ an intercept near zero, and a
                      regression coefficient R2 > 0.99; whereas, scattering
                      measurements had a slope of 1.01 $(−0.07/\+0.06),$ an
                      intercept of less than $\+/−2$ × 10−6 m−1
                      (Mm−1), and a coefficient R2 ∼ 1.0. The derived CAPS
                      PMssa absorption compared well to the PSAP measurements at
                      low levels (< 70 Mm−1) for the small particle sizes and
                      modest (0.4 to 0.6) SSA values tested, with a linear
                      regression slope of 1.0, an intercept of −4 Mm−1, and a
                      coefficient R2 = 0.97. Comparisons at higher particle
                      loadings were compromised by loading effects on the PSAP
                      filters. For the SSA measurements, agreement was highest
                      (regression slopes within $1\%$ ) for SSA = 1.0 particles,
                      though the difference between the measured values increased
                      to 9 $\%$ for extinction coefficients lower than 55 Mm−1.
                      SSA measurements for absorbing particles exhibited absolute
                      differences up to 18 $\%,$ though it is not clear which
                      measurement had the lowest accuracy. For a given particle
                      type, the CAPS PMssa instrument exhibited the lowest scatter
                      around the average. This study demonstrates that the CAPS
                      PMssa is a robust and reliable instrument for the direct
                      measurement of the scattering and extinction coefficients
                      and thus SSA. This conclusion also holds as well for the
                      indirect measurement of the absorption coefficient with the
                      constraint that the accuracy of this particular measurement
                      degrades as the SSA and particle size increases.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243)},
      pid          = {G:(DE-HGF)POF3-243},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/amt-2019-146},
      url          = {https://juser.fz-juelich.de/record/890236},
}