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- W2058903389 abstract "Airborne measurements of aerosol light scattering (using nephelometers) and absorption (using particle/soot absorption photometers; PSAPs) in the Asian outflow region are presented. Aerosol particles were sampled through a new low turbulence inlet that proved very effective at transmitting coarse‐mode particles. Noise and artifacts are characterized using in‐flight measurements of particle‐free air and measurements with identical instruments operated in parallel. For example, the sensitivities of PSAP noise to changing altitude, changing relative humidity (RH), and particle‐loading on the internal filter are quantified. On the basis of these and previous instrument characterizations, we report averages, variations, and uncertainties of optical properties, focusing on data from approximately 300 level‐leg samples obtained during 19 research flights in the spring of 2001. Several broad patterns emerge from this analysis. Two dominant components, fine‐mode pollution and coarse‐mode mineral dust, were observed to vary independently when separated using a cut point of 1 μm aerodynamic diameter at low RH. Fine‐mode pollution was found to be moderately absorbing (single scatter albedo at low RH and 550 nm, ω = 0.88 ± 0.03; mean and 95% confidence uncertainty) and moderately hygroscopic (relative increase in scattering from 40% to 85% RH, f RH = 1.7 ± 0.2), while coarse‐mode dust was found to have very low absorption (ω = 0.96 ± 0.01) and to be almost nonhygroscopic (f RH = 1.1 ± 0.1). These and other optical properties are intended to serve as constraints on optical models of the Asian aerosol for the purpose of satellite retrievals and calculations of direct radiative effects." @default.
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- W2058903389 date "2003-08-19" @default.
- W2058903389 modified "2023-10-15" @default.
- W2058903389 title "Variability of aerosol optical properties derived from in situ aircraft measurements during ACE-Asia" @default.
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- W2058903389 doi "https://doi.org/10.1029/2002jd003247" @default.
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