Search Results - "Ng, N. L"

Aerosol characterization over the southeastern United States using high-resolution aerosol mass spectrometry: spatial and seasonal variation of aerosol composition and sources with a focus on organic nitrates by Xu, L, Suresh, S, Guo, H, Weber, R. J, Ng, N. L

“…We deployed a High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) and an Aerosol Chemical Speciation Monitor (ACSM) to characterize the…”
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Real-Time Methods for Estimating Organic Component Mass Concentrations from Aerosol Mass Spectrometer Data by Ng, N. L, Canagaratna, M. R, Jimenez, J. L, Zhang, Q, Ulbrich, I. M, Worsnop, D. R

“…We use results from positive matrix factorization (PMF) analysis of 15 urban aerosol mass spectrometer (AMS) data sets to derive simple methods for estimating…”
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Fine-particle water and pH in the southeastern United States by Guo, H, Xu, L, Bougiatioti, A, Cerully, K. M, Capps, S. L, Hite Jr., J. R, Carlton, A. G, Lee, S.-H, Bergin, M. H, Ng, N. L, Nenes, A, Weber, R. J

“…Particle water and pH are predicted using meteorological observations (relative humidity (RH), temperature (T)), gas/particle composition, and thermodynamic…”
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Secondary organic aerosol formation from the β-pinene+NO3 system: effect of humidity and peroxy radical fate by Boyd, C M, Sanchez, J, L Xu, Eugene, A J, Nah, T, Tuet, W Y, Guzman, M I, Ng, N L

“…The formation of secondary organic aerosol (SOA) from the oxidation ofβ-pinene via nitrate radicals is investigated in the Georgia Tech Environmental Chamber…”
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Changes in organic aerosol composition with aging inferred from aerosol mass spectra by Ng, N. L., Canagaratna, M. R., Jimenez, J. L., Chhabra, P. S., Seinfeld, J. H., Worsnop, D. R.

“…Organic aerosols (OA) can be separated with factor analysis of aerosol mass spectrometer (AMS) data into hydrocarbon-like OA (HOA) and oxygenated OA (OOA). We…”
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On the link between hygroscopicity, volatility, and oxidation state of ambient and water-soluble aerosols in the southeastern United States by Cerully, K. M, Bougiatioti, A, Hite Jr., J. R, Guo, H, Xu, L, Ng, N. L, Weber, R, Nenes, A

“…The formation of secondary organic aerosols (SOAs) combined with the partitioning of semivolatile organic components can impact numerous aerosol properties…”
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An Aerosol Chemical Speciation Monitor (ACSM) for Routine Monitoring of the Composition and Mass Concentrations of Ambient Aerosol by Ng, N. L., Herndon, S. C., Trimborn, A., Canagaratna, M. R., Croteau, P. L., Onasch, T. B., Sueper, D., Worsnop, D. R., Zhang, Q., Sun, Y. L., Jayne, J. T.

“…We present a new instrument, the Aerosol Chemical Speciation Monitor (ACSM), which routinely characterizes and monitors the mass and chemical composition of…”
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The AeroCom evaluation and intercomparison of organic aerosol in global models by Tsigaridis, K, Daskalakis, N, Kanakidou, M, Adams, P. J, Artaxo, P, Bahadur, R, Balkanski, Y, Bauer, S. E, Bellouin, N, Benedetti, A, Bergman, T, Berntsen, T. K, Beukes, J. P, Bian, H, Carslaw, K. S, Chin, M, Curci, G, Diehl, T, Easter, R. C, Ghan, S. J, Gong, S. L, Hodzic, A, Hoyle, C. R, Iversen, T, Jathar, S, Jimenez, J. L, Kaiser, J. W, Kirkevåg, A, Koch, D, Kokkola, H, Lee, Y. H, Lin, G, Liu, X, Luo, G, Ma, X, Mann, G. W, Mihalopoulos, N, Morcrette, J.-J, Müller, J.-F, Myhre, G, Myriokefalitakis, S, Ng, N. L, O'Donnell, D, Penner, J. E, Pozzoli, L, Pringle, K. J, Russell, L. M, Schulz, M, Sciare, J, Seland, Ã, Shindell, D. T, Sillman, S, Skeie, R. B, Spracklen, D, Stavrakou, T, Steenrod, S. D, Takemura, T, Tiitta, P, Tilmes, S, Tost, H, van Noije, T, van Zyl, P. G, von Salzen, K, Yu, F, Wang, Z, Zaveri, R. A, Zhang, H, Zhang, K, Zhang, Q, Zhang, X

“…This paper evaluates the current status of global modeling of the organic aerosol (OA) in the troposphere and analyzes the differences between models as well…”
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Factor analysis of combined organic and inorganic aerosol mass spectra from high resolution aerosol mass spectrometer measurements by Sun, Y. L, Zhang, Q, Schwab, J. J, Yang, T, Ng, N. L, Demerjian, K. L

“…Positive matrix factorization (PMF) was applied to the merged high resolution mass spectra of organic and inorganic aerosols from aerosol mass spectrometer…”
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Secondary organic aerosol formation from m-xylene, toluene, and benzene by Ng, N. L., Kroll, J. H., Chan, A. W. H., Chhabra, P. S., Flagan, R. C., Seinfeld, J. H.

“…Secondary organic aerosol (SOA) formation from the photooxidation of m-xylene, toluene, and benzene is investigated in the Caltech environmental chambers…”
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Biomass burning dominates brown carbon absorption in the rural southeastern United States by Washenfelder, R. A., Attwood, A. R., Brock, C. A., Guo, H., Xu, L., Weber, R. J., Ng, N. L., Allen, H. M., Ayres, B. R., Baumann, K., Cohen, R. C., Draper, D. C., Duffey, K. C., Edgerton, E., Fry, J. L., Hu, W. W., Jimenez, J. L., Palm, B. B., Romer, P., Stone, E. A., Wooldridge, P. J., Brown, S. S.

“…Brown carbon aerosol consists of light‐absorbing organic particulate matter with wavelength‐dependent absorption. Aerosol optical extinction, absorption, size…”
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Secondary Brown Carbon Formation From Photooxidation of Furans From Biomass Burning by Joo, T., Machesky, J. E., Zeng, L., Hass‐Mitchell, T., Weber, R. J., Gentner, D. R., Ng, N. L.

“…Furans are a major class of volatile organic compounds emitted from biomass burning. Their high reactivity with atmospheric oxidants leads to the formation of…”
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Organic aerosol components observed in Northern Hemispheric datasets from Aerosol Mass Spectrometry by Ng, N. L., Canagaratna, M. R., Zhang, Q., Jimenez, J. L., Tian, J., Ulbrich, I. M., Kroll, J. H., Docherty, K. S., Chhabra, P. S., Bahreini, R., Murphy, S. M., Seinfeld, J. H., Hildebrandt, L., Donahue, N. M., DeCarlo, P. F., Lanz, V. A., Prévôt, A. S. H., Dinar, E., Rudich, Y., Worsnop, D. R.

“…In this study we compile and present results from the factor analysis of 43 Aerosol Mass Spectrometer (AMS) datasets (27 of the datasets are reanalyzed in this…”
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Secondary organic aerosol yields of 12-carbon alkanes by Loza, C. L, Craven, J. S, Yee, L. D, Coggon, M. M, Schwantes, R. H, Shiraiwa, M, Zhang, X, Schilling, K. A, Ng, N. L, Canagaratna, M. R, Ziemann, P. J, Flagan, R. C, Seinfeld, J. H

“…Secondary organic aerosol (SOA) yields were measured for cyclododecane, hexylcyclohexane, n-dodecane, and 2-methylundecane under high-NOx conditions, in which…”
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Advanced source apportionment of size-resolved trace elements at multiple sites in London during winter by Visser, S, Slowik, J. G, Furger, M, Zotter, P, Bukowiecki, N, Canonaco, F, Flechsig, U, Appel, K, Green, D. C, Tremper, A. H, Young, D. E, Williams, P. I, Allan, J. D, Coe, H, Williams, L. R, Mohr, C, Xu, L, Ng, N. L, Nemitz, E, Barlow, J. F, Halios, C. H, Fleming, Z. L, Baltensperger, U, Prévôt, A. S. H

“…Trace element measurements in PM10–2.5, PM2.5–1.0 and PM1.0–0.3 aerosol were performed with 2 h time resolution at kerbside, urban background and rural sites…”
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Elemental composition and oxidation of chamber organic aerosol by Chhabra, P. S., Ng, N. L., Canagaratna, M. R., Corrigan, A. L., Russell, L. M., Worsnop, D. R., Flagan, R. C., Seinfeld, J. H.

“…Recently, graphical representations of aerosol mass spectrometer (AMS) spectra and elemental composition have been developed to explain the oxidative and aging…”
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Evaluating the degree of oxygenation of organic aerosol during foggy and hazy days in Hong Kong using high-resolution time-of-flight aerosol mass spectrometry (HR-ToF-AMS) by Li, Y. J, Lee, B. Y. L, Yu, J. Z, Ng, N. L, Chan, C. K

“…The chemical characteristics of organic aerosol (OA) are still poorly constrained. Here we present observation results of the degree of oxygenation of OA based…”
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Highly time-resolved chemical characterization of atmospheric submicron particles during 2008 Beijing Olympic Games using an Aerodyne High-Resolution Aerosol Mass Spectrometer by Huang, X.-F., He, L.-Y., Hu, M., Canagaratna, M. R., Sun, Y., Zhang, Q., Zhu, T., Xue, L., Zeng, L.-W., Liu, X.-G., Zhang, Y.-H., Jayne, J. T., Ng, N. L., Worsnop, D. R.

“…As part of Campaigns of Air Quality Research in Beijing and Surrounding Region-2008 (CAREBeijing-2008), an Aerodyne High-Resolution Time-of-Flight Aerosol Mass…”
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Global modeling of secondary organic aerosol formation from aromatic hydrocarbons: high- vs. low-yield pathways by Henze, D. K., Seinfeld, J. H., Ng, N. L., Kroll, J. H., Fu, T.-M., Jacob, D. J., Heald, C. L.

“…Formation of SOA from the aromatic species toluene, xylene, and, for the first time, benzene, is added to a global chemical transport model. A simple mechanism…”
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Chemical characterization of springtime submicrometer aerosol in Po Valley, Italy by Saarikoski, S, Carbone, S, Decesari, S, Giulianelli, L, Angelini, F, Canagaratna, M, Ng, N. L, Trimborn, A, Facchini, M. C, Fuzzi, S, Hillamo, R, Worsnop, D

“…The chemistry of submicron particles was investigated at San Pietro Capofiume (SPC) measurement station in the Po Valley, Italy, in spring 2008. The…”
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