Výsledky vyhledávání - "Christopher M. Kenseth"

An Updated Modeling Framework to Simulate Los Angeles Air Quality. Part 1: Model Development, Evaluation, and Source Apportionment

Autor: Elyse A. Pennington, Yuan Wang, Benjamin C. Schulze, Karl M. Seltzer, Jiani Yang, Bin Zhao, Zhe Jiang, Hongru Shi, Melissa Venecek, Daniel Chau, Benjamin N. Murphy, Christopher M. Kenseth, Ryan X. Ward, Havala O. T. Pye, John H. Seinfeld

Publikováno v: eISSN

This study describes a modeling framework, model evaluation, and source apportionment to understand the causes of Los Angeles (LA) air pollution. A few major updates are applied to the Community Multiscale Air Quality (CMAQ) Model with high spatial r

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a76d5f6c5cbca549e9dc5bb54c05ac16
https://doi.org/10.5194/egusphere-2023-749

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Coupling Filter-Based Thermal Desorption Chemical Ionization Mass Spectrometry with Liquid Chromatography/Electrospray Ionization Mass Spectrometry for Molecular Analysis of Secondary Organic Aerosol

Autor: Yuanlong Huang, John H. Seinfeld, Christopher M. Kenseth, Nathan F. Dalleska

Publikováno v: Environmental Science & Technology. 54:13238-13248

Filter-based thermal desorption (F-TD) techniques, such as the filter inlet for gases and aerosols, are widely employed to investigate the molecular composition and physicochemical properties of secondary organic aerosol (SOA). Here, we introduce an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::974ec79b7e18453c287d9287600549ab
https://doi.org/10.1021/acs.est.0c01779

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Observations of Volatile Organic Compounds in the Los Angeles Basin during COVID-19

Autor: John H. Seinfeld, Afsara Tasnia, John D. Crounse, Benjamin C. Schulze, Paul O. Wennberg, Donald R. Blake, Christopher M. Kenseth, Reina S. Buenconsejo, Sara Murphy, Simone Meinardi, Barbara Barletta, H. A. Parker, Kelley C. Barsanti, Paul Van Rooy

Volatile organic compounds (VOCs) were measured in the Los Angeles (LA) Basin from mid-April to mid-July 2020 during the COVID-19 pandemic, as a part of the Los Angeles Air Quality Campaign (LAAQC). VOCs were quantified in over 450 samples using one-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d94090cfce54363694f16a5f7a7a93de
https://resolver.caltech.edu/CaltechAUTHORS:20211118-233559021

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Efficacy of a portable, moderate-resolution, fast-scanning DMA for ambient aerosol size distribution measurements

Autor: John H. Seinfeld, Stavros Amanatidis, Yuanlong Huang, Benjamin C. Schulze, Ryan X. Ward, Richard C. Flagan, Susanne V. Hering, Christopher M. Kenseth, Buddhi Pushpawela

Ambient aerosol size distributions obtained with a compact, scanning mobility analyzer, the Spider DMA, are compared to those obtained with a conventional mobility analyzer, with specific attention to the effect of mobility resolution on the measured

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7d6b512debc4c96562bcbd83b0374050
https://amt.copernicus.org/preprints/amt-2021-59/

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Synthesis of Carboxylic Acid and Dimer Ester Surrogates to Constrain the Abundance and Distribution of Molecular Products in α-Pinene and β-Pinene Secondary Organic Aerosol

Autor: Nicholas J Hafeman, Christopher M. Kenseth, Nathan F. Dalleska, Brian M. Stoltz, John H. Seinfeld, Yuanlong Huang

Liquid chromatography/negative electrospray ionization mass spectrometry [LC/(−)ESI-MS] is routinely employed to characterize the identity and abundance of molecular products in secondary organic aerosol (SOA) derived from monoterpene oxidation. Du

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b6e6e69fa22d289de14c73bb88f57a3c
https://resolver.caltech.edu/CaltechAUTHORS:20200819-162804852

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Characterization of Aerosol Hygroscopicity Over the Northeast Pacific Ocean: Impacts on Prediction of CCN and Stratocumulus Cloud Droplet Number Concentrations

Autor: Roy K. Woods, Richard C. Flagan, H. H. Jonsson, Kelvin H. Bates, Benjamin C. Schulze, Weimeng Kong, Andrew R. Metcalf, Armin Sorooshian, John H. Seinfeld, Christopher M. Kenseth, Sophia M. Charan, W. Williams

Publikováno v: Earth and Space Science, Vol 7, Iss 7, Pp n/a-n/a (2020)
Earth and space science (Hoboken, N.J.)

During the Marine Aerosol Cloud and Wildfire Study (MACAWS) in June and July of 2018, aerosol composition and cloud condensation nuclei (CCN) properties were measured over the N.E. Pacific to characterize the influence of aerosol hygroscopicity on pr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7cf7392fcb75021292e46dfe6b00cb27
https://doaj.org/article/49d62889bdb54271ae93d700817b72f5

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Synergistic O 3 + OH oxidation pathway to extremely low-volatility dimers revealed in β-pinene secondary organic aerosol

Autor: Brian M. Stoltz, Yuanlong Huang, J. Caleb Hethcox, Christopher M. Kenseth, John H. Seinfeld, R. Zhao, Nathan F. Dalleska

Publikováno v: Proceedings of the National Academy of Sciences. 115:8301-8306

Dimeric compounds contribute significantly to the formation and growth of atmospheric secondary organic aerosol (SOA) derived from monoterpene oxidation. However, the mechanisms of dimer production, in particular the relevance of gas- vs. particle-ph

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6413a6518b676d6e933533e81e70e4a7
https://doi.org/10.1073/pnas.1804671115

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Rapid Aqueous-Phase Hydrolysis of Ester Hydroperoxides Arising from Criegee Intermediates and Organic Acids

Autor: Jierou Chen, Yuanlong Huang, Nathan F. Dalleska, R. Zhao, Suzanne E. Paulson, Christopher M. Kenseth, John H. Seinfeld, Xiaobi Michelle Kuang

Publikováno v: The Journal of Physical Chemistry A. 122:5190-5201

Stabilized Criegee intermediates react with organic acids in the gas phase and at the air–water interface to form a class of ester hydroperoxides, α-acyloxyalkyl hydroperoxides (αAAHPs). A number of recent studies have proposed the importance of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ea7449c14184324842e9e325b75ee44e
https://doi.org/10.1021/acs.jpca.8b02195

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Photopolarimetric Sensitivity to Black Carbon Content of Wildfire Smoke: Results From the 2016 ImPACT-PM Field Campaign

Autor: Olga V. Kalashnikova, John H. Seinfeld, Weimeng Kong, Alexei Lyapustin, Christopher D. Cappa, Felix C. Seidel, H. H. Jonsson, Kelvin H. Bates, Michael J. Garay, Feng Xu, David J. Diner, Christopher M. Kenseth

Publikováno v: Journal of Geophysical Research: Atmospheres. 123:5376-5396

Detailed characterization of the aerosol content of wildfire smoke plumes is typically performed through in situ aircraft observations, which have limited temporal and spatial coverage. Extending such observations to regional or global scales require

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bae97059fecf5e1d56a7086c709619bd
https://doi.org/10.1029/2017jd028032

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