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The majority of airborne aerosol measurements employ forward-facing inlets with near-isokinetic sampling; these inlets have known artifacts when sampling in clouds such that data taken in cloud must typically be discarded. Here we report first results from a perpendicular inlet for sampling interstitial submicron black-carbon (BC) containing aerosol. The inlet, consisting of a flat plate to stabilize flow prior to perpendicular sampling, was evaluated using a single particle soot photometer (SP2) aboard the NASA WB-57F aircraft during the Midlatitude Airborne Cirrus Properties Experiment (MACPEX) of 2011. The new inlet rejects large particles and is free of aerosol artifacts when sampling in ice clouds while allowing sampling of submicron BC-containing aerosol with the same unit efficiency as a validated isokinetic inlet, thus allowing for airborne sampling of interstitial BC aerosol. Copyright 2013 American Association for Aerosol Research [ABSTRACT FROM AUTHOR]

The article presents a study that evaluates the performance of the Single Particle Soot Photometer (SP2) and the Integrating Sphere/Integrating Sandwich Spectrophotometer (ISSW) in measuring the concentration of refractory black carbon (BC) in snow. It found that the SP2 can be used to measure the size distribution and mass concentration of BC in the snow. It suggests that estimates of BC mass concentration may be associated with significant underestimates of uncertainty.

The article focuses on the design and use of the new ultraviolet (UV) photometer for in situ measurement of atmospheric ozone (O 3) from research aircraft. It says that a polarization optical-isolator configuration is used to fold the UV-beam within the absorption cells. It also mentions that the photometer has high accuracy, fast sampling rate, and excellent precision.

The article presents a study which assesses the measurement techniques in quantifying the concentration of refractory black carbon (BC) in snow samples. The comparison of the Single Particle Soot Photometer (SP2) and the Integrating Sphere/Integrating Sandwich Spectrophotometer (ISSW) in the quantification of BC concentration is outlined. Underestimates of uncertainty in the measurement of BC concentration using SP2 or ISSW are investigated.

The article presents a study which describes the design of an ultraviolet (UV) photometer instrument for the measurement of atmospheric ozone. The accuracy, sampling rate and precision of the instrument for research aircraft platforms are outlined. The inlet and exhaust configurations of the instrument for unmanned aircraft systems (UASs) are examined.