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    Academic Journals

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• Identifying chemical aerosol signatures using optical suborbital observations: how much can optical properties tell us about aerosol composition?

  Authors:Meloë S. F. Kacenelenbogen, Qian Tan, Sharon P. Burton, Otto P. Hasekamp, Karl D. Froyd, Yohei Shinozuka, et al.From:Atmospheric Chemistry and Physics (Vol. 22, Issue 6) Peer-Reviewed

  Mar. 21, 2022491 words Article Improvements in air quality and Earth's climate predictions require improvements of the aerosol speciation in chemical transport models, using observational constraints. Aerosol speciation (e.g., organic aerosols, black...

• Inline coupling of simple and complex chemistry modules within the global weather forecast model FIM (FIM-Chem v1).

  Authors:Li Zhang, Georg A. Grell, Stuart A. McKeen, Ravan Ahmadov, Karl D. Froyd, and Daniel MurphyFrom:Geoscientific Model Development (Vol. 15, Issue 2) Peer-Reviewed

  Jan. 20, 2022337 words Brief article The global Flow-following finite-volume Icosahedral Model (FIM), which was developed in the Global Systems Laboratory (GSL) of NOAA, has been coupled inline with aerosol and gas-phase chemistry schemes of different...

• 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...

• Improved identification of primary biological aerosol particles using single-particle mass spectrometry

  Authors:Maria A. Zawadowicz, Karl D. Froyd, Daniel M. Murphy, and Daniel J. CziczoFrom:Atmospheric Chemistry and Physics (Vol. 17, Issue 11) Peer-Reviewed

  June 16, 2017229 words Author abstract, Bri... Measurements of primary biological aerosol particles (PBAP), especially at altitudes relevant to cloud formation, are scarce. Single-particle mass spectrometry (SPMS) has been used to probe aerosol chemical composition...

• Experimental thermodynamics of cluster ions composed of H2SO4 and H2O. 1. positive ions

  Authors:Karl D. Froyd, Edward R. Lovejoy, James F. Wishart, and Yasuyuki ArakiFrom:Journal of Physical Chemistry A (Vol. 107, Issue 46) Peer-Reviewed

  Nov. 20, 200337 words Article

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• Cluster ion thermal decomposition (I): experimental kinetics study and ab initio calculations for HSO (sub)4 (super)- (H (sub)2 SO (sub)4) (sub)x (HNO (sub)3) (sub)y

  Authors:Joachim Curtius, Karl D. Froyd, and Edward R. LovejoyFrom:Journal of Physical Chemistry A (Vol. 105, Issue 48) Peer-Reviewed

  Dec. 6, 2001 Article

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• 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...

• 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...

• 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...

• Clarifying the dominant sources and mechanisms of cirrus cloud formation

  Authors:Daniel J. Cziczo, Karl D. Froyd, Corinna Hoose, Eric J. Jensen, Minghui Diao, Mark A. Zondlo, et al.From:Science (Vol. 340, Issue 6138) Peer-Reviewed

  June 14, 2013119 words Author abstract, Rep...

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• Fine particle pH and gas-particle phase partitioning of inorganic species in Pasadena, California, during the 2010 CalNex campaign

  Authors:Hongyu Guo, Jiumeng Liu, Karl D. Froyd, James M. Roberts, Patrick R. Veres, Patrick L. Hayes, et al.From:Atmospheric Chemistry and Physics (Vol. 17, Issue 9) Peer-Reviewed

  May 8, 2017350 words Author abstract, Bri... pH is a fundamental aerosol property that affects ambient particle concentration and composition, linking pH to all aerosol environmental impacts. Here, PM.sub.1 and PM.sub.2. 5 pH are calculated based on data from...

• 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...

• Experimental thermodynamics of cluster ions composed of H2SO4 and H2O. 2. Measurements and ab initio structures of negative ions

  Authors:Karl D. Froyd, Edward R. Lovejoy, James F. Wishart, and Yasuyuki ArakiFrom:Journal of Physical Chemistry A (Vol. 107, Issue 46) Peer-Reviewed

  Nov. 20, 200345 words Article

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• 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...

• Single-particle time-of-flight mass spectrometry utilizing a femtosecond desorption and ionization laser

  Authors:Maria A. Zawadowicz, Ahmed Abdelmonem, Claudia Mohr, Harald Saathoff, Karl D. Froyd, Daniel M. Murphy, et al.From:Analytical Chemistry (Vol. 87, Issue 24) Peer-Reviewed

  Dec. 15, 201592 words Report

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• Model-measurement consistency and limits of bioaerosol abundance over the continental United States.

  Authors:Maria A. Zawadowicz, Karl D. Froyd, Anne E. Perring, Daniel M. Murphy, Dominick V. Spracklen, Colette L. Heald, et al.From:Atmospheric Chemistry and Physics (Vol. 19, Issue 22) Peer-Reviewed

  Nov. 19, 2019256 words Brief article Due to low concentrations and chemical complexity, in situ observations of bioaerosol are geographically and temporally sparse, and this limits the accuracy of current emissions inventories. In this study, we apply a new...

• Characterization of organic aerosol across the global remote troposphere: a comparison of ATom measurements and global chemistry models.

  Authors:Alma Hodzic, Pedro Campuzano-Jost, Huisheng Bian, Mian Chin, Peter R. Colarco, Douglas A. Day, et al.From:Atmospheric Chemistry and Physics (Vol. 20, Issue 8) Peer-Reviewed

  Apr. 21, 2020509 words Article The spatial distribution and properties of submicron organic aerosol (OA) are among the key sources of uncertainty in our understanding of aerosol effects on climate. Uncertainties are particularly large over remote...

• Bond energies and structures of ammonia-sulfuric acid positive cluster ions

  Authors:Karl D. Froyd and Edward R. LovejoyFrom:Journal of Physical Chemistry A (Vol. 116, Issue 24) Peer-Reviewed

  June 21, 2012 Report

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• 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,...