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dc.contributor.authorHallar, A. G.
dc.contributor.authorStrawa, A. W.
dc.contributor.authorSchmid, B.
dc.contributor.authorAndrews, E.
dc.contributor.authorOgren, J.
dc.contributor.authorSheridan, P.
dc.contributor.authorFerrare, R.
dc.contributor.authorCovert, D.
dc.contributor.authorElleman, R.
dc.contributor.authorJonsson, H.
dc.contributor.authorBokarius, K.
dc.contributor.authorLuu, A.
dc.date2006
dc.date.accessioned2014-06-11T23:18:32Z
dc.date.available2014-06-11T23:18:32Z
dc.date.issued2006
dc.identifier.urihttp://hdl.handle.net/10945/42220
dc.descriptionJournal of Geophyshysical Research, Vol. 111, No. D5, D05S09en_US
dc.descriptionThe article of record as published may be located at http://dx.doi.org/10.1029/2005JD006250en_US
dc.description.abstractIn May 2003, a Twin Otter airplane, equipped with instruments for making in situ measurements of aerosol optical properties, was deployed during the Atmospheric Radiation Measurements (ARM) Program’s Aerosol Intensive Operational Period in Oklahoma. Several of the Twin Otter flights were flown in formation with an instrumented light aircraft (Cessna 172XP) that makes routine in situ aerosol profile flights over the site. This paper presents comparisons of measured scattering coefficients at 467 nm, 530 nm, and 675 nm between identical commercial nephelometers aboard each aircraft. Overall, the agreement between the two nephelometers decreases with longer wavelength. During the majority of the flights, the Twin Otter flew with a diffuser inlet while the Cessna had a 1 mm impactor, allowing for an estimation of the fine mode fraction aloft. The fine mode fraction aloft was then compared to the results of a ground-based nephelometer. Comparisons are also provided in which both nephelometers operated with identical 1 mm impactors. These scattering coefficient comparisons are favorable at the longer wavelengths (i.e., 530 nm and 675 nm), yet differed by approximately 30% at 467 nm. Mie scattering calculations were performed using size distribution measurements, made during the level flight legs. Results are also presented from Cadenza, a new continuous wave cavity ring-down (CW-CRD) instrument, which compared favorably (i.e., agreed within 2%) with data from other instruments aboard the Twin Otter. With this paper, we highlight the significant implications of coarse mode (larger than 1 mm) aerosol aloft with respect to aerosol optical properties.en_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, may not be copyrighted.en_US
dc.titleAtmospheric Radiation Measurements Aerosol Intensive Operating Period: Comparison of aerosol scattering during coordinated flightsen_US
dc.contributor.departmentCenter for Interdisciplinary Remotely Piloted Aircraft Studies (CIRPAS)


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