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    Academic Journals

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• Laser imaging nephelometer for aircraft deployment.

  Authors:Adam T. Ahern, Frank Erdesz, Nicholas L. Wagner, Charles A. Brock, Ming Lyu, Kyra Slovacek, et al.From:Atmospheric Measurement Techniques (Vol. 15, Issue 5) Peer-Reviewed

  Mar. 4, 2022220 words Brief article Validation of remote sensing retrievals of aerosol microphysical and optical properties requires in situ measurements of the same properties. We present here an improved imaging nephelometer for measuring the...

• Ambient aerosol properties in the remote atmosphere from global-scale in situ measurements.

  Authors:Charles A. Brock, Karl D. Froyd, Maximilian Dollner, Christina J. Williamson, Gregory Schill, Daniel M. Murphy, et al.From:Atmospheric Chemistry and Physics (Vol. 21, Issue 19) Peer-Reviewed

  Oct. 8, 2021488 words Article In situ measurements of aerosol microphysical, chemical, and optical properties were made during global-scale flights from 2016-2018 as part of the Atmospheric Tomography Mission (ATom). The NASA DC-8 aircraft flew from...

• Modification, calibration, and performance of the Ultra-High Sensitivity Aerosol Spectrometer for particle size distribution and volatility measurements during the Atmospheric Tomography Mission (ATom) airborne campaign

  Authors:Agnieszka Kupc, Christina Williamson, Nicholas L. Wagner, Mathews Richardson, and Charles A. BrockFrom:Atmospheric Measurement Techniques (Vol. 11, Issue 1) Peer-Reviewed

  Jan. 17, 2018355 words Author abstract, Bri...

  Atmospheric aerosol is a key component of the chemistry and climate of the Earth's atmosphere. Accurate measurement of the concentration of atmospheric particles as a function of their size is fundamental to...

• Drivers of cloud droplet number variability in the summertime in the southeastern United States.

  Authors:Aikaterini Bougiatioti, Athanasios Nenes, Jack J. Lin, Charles A. Brock, Joost A. de Gouw, Jin Liao, et al.From:Atmospheric Chemistry and Physics (Vol. 20, Issue 20) Peer-Reviewed

  Oct. 27, 2020345 words Brief article Here we analyze regional-scale data collected on board the NOAA WP-3D aircraft during the 2013 Southeast Nexus (SENEX) campaign to study the aerosol-cloud droplet link and quantify the sensitivity of droplet number to...

• Secondary organic aerosol (SOA) yields from NO.sub.3 radical + isoprene based on nighttime aircraft power plant plume transects

  Authors:Juliane L. Fry, Steven S. Brown, Ann M. Middlebrook, Peter M. Edwards, Pedro Campuzano-Jost, Douglas A. Day, et al.From:Atmospheric Chemistry and Physics (Vol. 18, Issue 16) Peer-Reviewed

  Aug. 16, 2018346 words Author abstract, Bri...

  Nighttime reaction of nitrate radicals (NO.sub.3) with biogenic volatile organic compounds (BVOC) has been proposed as a potentially important but also highly uncertain source of secondary organic aerosol (SOA). The...

• A new method to quantify mineral dust and other aerosol species from aircraft platforms using single-particle mass spectrometry.

  Authors:Karl D. Froyd, Daniel M. Murphy, Charles A. Brock, Pedro Campuzano-Jost, Jack E. Dibb, Jose-Luis Jimenez, et al.From:Atmospheric Measurement Techniques (Vol. 12, Issue 11) Peer-Reviewed

  Nov. 27, 2019408 words Article Single-particle mass spectrometry (SPMS) instruments characterize the composition of individual aerosol particles in real time. Their fundamental ability to differentiate the externally mixed particle types that...

• Fast time response measurements of particle size distributions in the 3-60nm size range with the nucleation mode aerosol size spectrometer

  Authors:Christina Williamson, Agnieszka Kupc, James Wilson, David W. Gesler, J. Michael Reeves, Frank Erdesz, et al.From:Atmospheric Measurement Techniques (Vol. 11, Issue 6) Peer-Reviewed

  June 19, 2018375 words Author abstract, Bri...

  Earth's radiation budget is affected by new particle formation (NPF) and the growth of these nanometre-scale particles to larger sizes where they can directly scatter light or act as cloud condensation nuclei (CCN)....

• Radiative and chemical implications of the size and composition of aerosol particles in the existing or modified global stratosphere.

  Authors:Daniel M. Murphy, Karl D. Froyd, Ilann Bourgeois, Charles A. Brock, Agnieszka Kupc, Jeff Peischl, et al.From:Atmospheric Chemistry and Physics (Vol. 21, Issue 11) Peer-Reviewed

  June 11, 2021389 words Brief article The size of aerosol particles has fundamental effects on their chemistry and radiative effects. We explore those effects using aerosol size and composition data in the lowermost stratosphere along with calculations of...

• Single-particle measurements of bouncing particles and in situ collection efficiency from an airborne aerosol mass spectrometer (AMS) with light-scattering detection

  Authors:Jin Liao, Charles A. Brock, Daniel M. Murphy, Donna T. Sueper, Andre Welti, and Ann M. MiddlebrookFrom:Atmospheric Measurement Techniques (Vol. 10, Issue 10) Peer-Reviewed

  Oct. 17, 2017335 words Author abstract, Bri... A light-scattering module was coupled to an airborne, compact time-of-flight aerosol mass spectrometer (LS-AMS) to investigate collection efficiency (CE) while obtaining nonrefractory aerosol chemical...

• Aerosol size distributions during the Atmospheric Tomography Mission (ATom): methods, uncertainties, and data products

  Authors:Charles A. Brock, Christina Williamson, Agnieszka Kupc, Karl D. Froyd, Frank Erdesz, Nicholas Wagner, et al.From:Atmospheric Measurement Techniques (Vol. 12, Issue 6) Peer-Reviewed

  June 6, 2019411 words Author abstract, Bri...

  From 2016 to 2018 a DC-8 aircraft operated by the US National Aeronautics and Space Administration (NASA) made four series of flights, profiling the atmosphere from 180 m to ∼12 km...

• Arctic air pollution: new insights from POLARCAT-IPY: POLARCAT provided a wealth of data on the concentrations and sources of short-lived climate pollutants (aerosols, ozone) and their precursors in the Arctic

  Authors:Katharine S. Law, Andreas Stohl, Patricia K. Quinn, Charles A. Brock, John F. Burkhart, Jean-Daniel Paris, et al.From:Bulletin of the American Meteorological Society (Vol. 95, Issue 12) Peer-Reviewed

  Dec. 201412,327 words Report 1620LABSTRACT Given the rapid nature of climate change occurring in the Arctic and the difficulty climate models have in quantitatively reproducing observed changes such as sea ice loss, it is important to improve...

• The potential role of organics in new particle formation and initial growth in the remote tropical upper troposphere.

  Authors:Agnieszka Kupc, Christina J. Williamson, Anna L. Hodshire, Jan Kazil, Eric Ray, T. Paul Bui, et al.From:Atmospheric Chemistry and Physics (Vol. 20, Issue 23) Peer-Reviewed

  Dec. 4, 2020580 words Article Global observations and model studies indicate that new particle formation (NPF) in the upper troposphere (UT) and subsequent particles supply 40 %-60 % of cloud condensation nuclei (CCN) in the lower troposphere, thus...

• Fast time response measurements of particle size distributions in the 3-60 nm size range with the nucleation mode aerosol size spectrometer

  Authors:Christina Williamson, Agnieszka Kupc, James Wilson, David W. Gesler, J. Michael Reeves, Frank Erdesz, et al.From:Atmospheric Measurement Techniques (Vol. 11, Issue 6) Peer-Reviewed

  June 19, 2018380 words Author abstract, Bri...

  Earth's radiation budget is affected by new particle formation (NPF) and the growth of these nanometre-scale particles to larger sizes where they can directly scatter light or act as cloud condensation nuclei (CCN)....

• Large hemispheric difference in nucleation mode aerosol concentrations in the lowermost stratosphere at mid- and high latitudes.

  Authors:Christina J. Williamson, Agnieszka Kupc, Andrew Rollins, Jan Kazil, Karl D. Froyd, Eric A. Ray, et al.From:Atmospheric Chemistry and Physics (Vol. 21, Issue 11) Peer-Reviewed

  June 15, 2021322 words Brief article The details of aerosol processes and size distributions in the stratosphere are important for both heterogeneous chemistry and aerosol-radiation interactions. Using in situ, global-scale measurements of the size...

• Complex refractive indices in the ultraviolet and visible spectral region for highly absorbing non-spherical biomass burning aerosol.

  Authors:Caroline C. Womack, Katherine M. Manfred, Nicholas L. Wagner, Gabriela Adler, Alessandro Franchin, Kara D. Lamb, et al.From:Atmospheric Chemistry and Physics (Vol. 21, Issue 9) Peer-Reviewed

  May 12, 2021271 words Brief article Biomass burning aerosol is a major source of PM.sub.2.5, and significantly affects Earth's radiative budget. The magnitude of its radiative effect is poorly quantified due to uncertainty in the optical properties of...

• Global airborne sampling reveals a previously unobserved dimethyl sulfide oxidation mechanism in the marine atmosphere.

  Authors:Patrick R. Veres, J. Andrew Neuman, Timothy H. Bertram, Emmanuel Assaf, Glenn M. Wolfe, Christina J. Williamson, et al.From:Proceedings of the National Academy of Sciences of the United States (Vol. 117, Issue 9) Peer-Reviewed

  Mar. 3, 20205,097 words Article 1590L

   Abstract Only

• Modification, calibration, and performance of the Ultra-High Sensitivity Aerosol Spectrometer for particle size distribution and volatility measurements during the Atmospheric Tomography Mission (ATom) airborne campaign

  Authors:Agnieszka Kupc, Christina Williamson, Nicholas L. Wagner, Mathews Richardson, and Charles A. BrockFrom:Atmospheric Measurement Techniques (Vol. 11, Issue 1) Peer-Reviewed

  Jan. 17, 201846 words Author abstract, Bri... Byline: Agnieszka Kupc, Christina Williamson, Nicholas L. Wagner, Mathews Richardson, Charles A. Brock To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link:...

• Evaluation of the accuracy of thermal dissociation CRDS and LIF techniques for atmospheric measurement of reactive nitrogen species

  Authors:Caroline C. Womack, J. Andrew Neuman, Patrick R. Veres, Scott J. Eilerman, Charles A. Brock, Zachary C. J. Decker, et al.From:Atmospheric Measurement Techniques (Vol. 10, Issue 5) Peer-Reviewed

  May 31, 2017397 words Author abstract, Bri... The sum of all reactive nitrogen species (NO.sub.y) includes NO.sub.x (NO.sub.2 + NO) and all of its oxidized forms, and the accurate detection of NO.sub.y is critical to understanding atmospheric nitrogen chemistry....

• The distribution of sea-salt aerosol in the global troposphere

  Authors:Daniel M. Murphy, Karl D. Froyd, Huisheng Bian, Charles A. Brock, Jack E. Dibb, Joshua P. DiGangi, et al.From:Atmospheric Chemistry and Physics (Vol. 19, Issue 6) Peer-Reviewed

  Apr. 2, 201970 words Author abstract, Bri... Byline: Daniel M. Murphy, Karl D. Froyd, Huisheng Bian, Charles A. Brock, Jack E. Dibb, Joshua P. DiGangi, Glenn Diskin, Maximillian Dollner, Agnieszka Kupc, Eric M. Scheuer, Gregory P. Schill, Bernadett Weinzierl,...

• Sizing response of the Ultra-High Sensitivity Aerosol Spectrometer (UHSAS) and Laser Aerosol Spectrometer (LAS) to changes in submicron aerosol composition and refractive index.

  Authors:Richard H. Moore, Elizabeth B. Wiggins, Adam T. Ahern, Stephen Zimmerman, Lauren Montgomery, Pedro Campuzano Jost, et al.From:Atmospheric Measurement Techniques (Vol. 14, Issue 6) Peer-Reviewed

  June 18, 2021507 words Article We evaluate the sensitivity of the size calibrations of two commercially available, high-resolution optical particle sizers to changes in aerosol composition and complex refractive index (RI). The Droplet Measurement...