An Evaluation of the Community Aerosol Inlet for the NCAR C-130 Research Aircraft

Blomquist, Byron; Huebert, B. J.; Howell, S. G.; Litchy, M.; Twohy, Cynthia H.; Schanot, Allen; Baumgardner, D.; Lafleur, B. G.; Seebaugh, R.; Laucks, M.L.

doi:10.1175/1520-0426(2001)018<1387:aeotca>2.0.co;2

Cited by 32 publications

(33 citation statements)

References 17 publications

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“…Sample air from the NCAR C-130 Community Aerosol Inlet (CAI) (Blomquist et al, 2001) was pulled at a rate of 180 l min À1 through a 1:06 mm cutoff impactor and then through the 3SPC. Efficiency curves for both the 1:06 mm cutoff impactor and the 3SPC are shown in Fig.…”

Section: Particle Concentratormentioning

confidence: 99%

“…For the sea-salt sample, the concentration factor drops to 50% of the mass-average concentration factor at 0.2 and 1:3 mm diameter, compared to 50% cutoff diameters of 0.3 and 1:2 mm for the dust sample. Uncertainties in the CAI inlet efficiency and PCASP size distributions (Blomquist et al, 2001;Collins et al, 2000;Liu and Daum, 2000) add an approximately 15% error to all calculated mass-average concentration factors.…”

Section: Particle Concentratormentioning

confidence: 99%

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FTIR measurements of functional groups and organic mass in aerosol samples over the Caribbean

Maria

Russell

Turpin

et al. 2002

Atmospheric Environment

206

199

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Section: Particle Concentratormentioning

confidence: 99%

Section: Particle Concentratormentioning

confidence: 99%

FTIR measurements of functional groups and organic mass in aerosol samples over the Caribbean

Maria

Russell

Turpin

et al. 2002

Atmospheric Environment

206

199

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“…The CAl was used by most aerosol instruments on the C-130 during both ACE-1 (Bates et al 1998) and INDOEX (Clarke et al 2002). An evaluation of the CAl efficiency in the Community Aerosol Inlet Evaluation Experiment (CAINE-2) showed that the CAl worked well for submicron particles, but its efficiency dropped rapidly above that, with a 50% cut size in the 2-3 JLm range (Blomquist et al 2001).…”

Section: Introductionmentioning

confidence: 99%

“…This technique has been applied to maintain laminar flow over airfoil surfaces (Lachman 1961). Suction through holes was effective in preventing separation but did not markedly reduce turbulence intensities (RMS speed/mean speed) in conical diffusers (Seebaugh et al 1996(Seebaugh et al , 1997Lafleur 1998;Blomquist 2001). However, diffusers manufactured entirely from sintered porous plastic reduced the turbulence intensity at the diffuser exits from the 50-60% range typical of solid diffusers to just a few percent (Seebaugh and Lafleur 1996;Lafleur 1998).…”

Section: Introductionmentioning

confidence: 99%

PELTI: Measuring the Passing Efficiency of an Airborne Low Turbulence Aerosol Inlet

Huebert

Howell

Covert

et al. 2004

Aerosol Science and Technology

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In an effort to improve the accuracy of airborne aerosol studies, we compared a new porous-diffuser low-turbulence inlet (LTI) with three other inlets on the NSF/NCAR C-130, using both dust and sea salt as test aerosols. Analysis of bulk filters behind the LTI and an external reference total aerosol sampler (TAS) found no significant differences, while both the NASA shrouded solid diffuser inlet (SD) and NCAR community aerosol inlet (CAl) passed smaller amounts. However, scanning electron microscopic analyses of particles behind the LTI and TAS confirmed the model prediction that the LTI porous diffuser (PD) enhanced 7 J.Lm particle concentrations by about 60%. Aerodynamic particle size distributions behind the other inlets began to diverge from enhancement-corrected LTI values above 2 J.Lm, with mass concentrations of larger particles lower by as much as a factor of ten behind the CAl and a factor of 2 behind the SD. We conclude that the corrected LTI distributions were closer to ambient values than those from either the CAl or the SD. Since tubing losses contributed the most uncertainty when deducing ambient supermicron size distributions from LTI data, minimizing them should be a high priority for future experiments. Measured transfer tubing losses were larger than model estimates, in part because of some complex pieces for which no suitable model exists. The LTI represents a significant advance in our ability to It is always a pleasure to work with the staff of NCAR's RAF, who provided us with support well above and beyond the call of duty. Krista Laursen and Alan Schanot were instrumental in getting the equipment installed and the experiment into the field successfully. Darrel Baumgardner worked with the FSSPs and their data. We are particularly grateful to the National Science Foundation for a series of grants that made the LTI and PELTI a reality, including ATM-9813515 and ATM-0002698 to UH. This is SOEST contribution No. 6206.

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“…They affect the radiation budget of the earth directly through absorption and scattering of radiation, and indirectly through their role in cloud formation (Charlson et al 1992;Haywood and Boucher 2000;Ramanathan et al 2001); also, aerosols also have important ramifications for human health (Lighty et al 2000). Many studies in recent decades have made use of airborne observations of aerosol and much work has been done to develop and characterize inlets for the sampling of aerosols of a wide range of sizes from aircraft (Hangal and Willeke 1990;Huebert et al 1990;Blomquist et al 2001;Hermann et al 2001;Hegg et al 2005;Bahreini et al 2008;von der Weiden et al 2009). Airborne sampling of aerosol is complicated by typically high velocities of aircraft and non-negligible inertia of the particles, which leads to sampling efficiencies that depend on particle mass and size, and sampling pressure (and therefore altitude).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a Perpendicular Inlet for Airborne Sampling of Interstitial Submicron Black-Carbon Aerosol

Perring

Schwarz

Gao

et al. 2013

Aerosol Science and Technology

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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.

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An Evaluation of the Community Aerosol Inlet for the NCAR C-130 Research Aircraft

Cited by 32 publications

References 17 publications

FTIR measurements of functional groups and organic mass in aerosol samples over the Caribbean

FTIR measurements of functional groups and organic mass in aerosol samples over the Caribbean

PELTI: Measuring the Passing Efficiency of an Airborne Low Turbulence Aerosol Inlet

Evaluation of a Perpendicular Inlet for Airborne Sampling of Interstitial Submicron Black-Carbon Aerosol

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