T. B. Onasch

A case study of ozone production, nitrogen oxides, and the radical budget in Mexico City (2009)

E. C. Wood, S. C. Herndon, T. B. Onasch, J. H. Kroll, M. R. Canagaratna, C. E. Kolb, ...

Observations at a mountain-top site within the Mexico City basin are used to characterize ozone production and destruction, nitrogen oxide speciation and chemistry, and the radical budget, with an...

Emission and chemistry of organic carbon in the gas and aerosol phase at a sub-urban site near Mexico City in March 2006 during the MILAGRO study (2009)

D. Welsh-Bon, C. Warneke, W. C. Kuster, L. Alexander, A. K. Baker, ...

Volatile organic compounds (VOCs) and carbonaceous aerosol were measured at a sub-urban site near Mexico City in March of 2006 during the MILAGRO study (Megacity Initiative: Local and Global Research...

Evaluating simulated primary anthropogenic and biomass burning organic aerosols during MILAGRO: implications for assessing treatments of secondary organic aerosols (2009)

J. D. Fast, A. C. Aiken, J. Allan, L. Alexander, T. Campos, M. R. Canagaratna, ...

Simulated primary organic aerosols (POA), as well as other particulates and trace gases, in the vicinity of Mexico City are evaluated using measurements collected during the 2006 Megacity Initiative:...

Evaluation of mobile emissions contributions to Mexico City's emissions inventory using on-road and cross-road emission measurements and ambient data (2009)

M. Zavala, S. C. Herndon, E. C. Wood, T. B. Onasch, W. B. Knighton, C. E. Kolb, ...

Mobile emissions represent a significant fraction of the total anthropogenic emissions burden in the Mexico City Metropolitan Area (MCMA) and, therefore, it is crucial to use top-down techniques...

Modeling organic aerosols during MILAGRO: application of the CHIMERE model and importance of biogenic secondary organic aerosols (2009)

A. Hodzic, J. L. Jimenez, S. Madronich, A. C. Aiken, B. Bessagnet, G. Curci, ...

The meso-scale chemistry-transport model CHIMERE is used to assess our understanding of major sources and formation processes leading to a fairly large amount of organic aerosols (OA, including...

Reduction in biomass burning aerosol light absorption upon humidification: roles of inorganically-induced hygroscopicity, particle collapse, and photoacoustic heat and mass transfer (2009)

K. A. Lewis, W. P. Arnott, H. Moosmüller, R. K. Chakrabarty, C. M. Carrico, S. M. Kreidenweis, ...

Smoke particle emissions from the combustion of biomass fuels typical for the western and southeastern United States were studied and compared under high humidity and ambient conditions in the...

Evaluating simulated primary anthropogenic and biomass burning organic aerosols during MILAGRO: implications for assessing treatments of secondary organic aerosols (2009)

J. Fast, A. C. Aiken, J. Allan, L. Alexander, T. Campos, M. R. Canagaratna, ...

Simulated primary organic aerosols (POA), as well as other particulates and trace gases, in the vicinity of Mexico City are evaluated using measurements collected during the 2006 Megacity Initiative:...

Evaluation of mobile emissions contributions to Mexico City's emissions inventory using on-road and cross-road emission measurements and ambient data (2009)

M. Zavala, S. C. Herndon, E. C. Wood, T. B. Onasch, W. B. Knighton, L. C. Marr, ...

Mobile emissions represent a significant fraction of the total anthropogenic emissions burden in the Mexico City Metropolitan Area (MCMA) and, therefore, it is crucial to use top-down techniques...

Modeling organic aerosols during MILAGRO: importance of biogenic secondary organic aerosols (2009)

A. Hodzic, J. L. Jimenez, S. Madronich, A. C. Aiken, B. Bessagnet, G. Curci, ...

The meso-scale chemistry-transport model CHIMERE is used to assess our understanding of major sources and formation processes leading to a fairly large amount of organic aerosols – OA, including...

Single particle characterization using a light scattering module coupled to a time-of-flight aerosol mass spectrometer (2009)

E. S. Cross, T. B. Onasch, M. Canagaratna, J. T. Jayne, J. Kimmel, ...

We present the first single particle results obtained with an Aerodyne time-of-flight aerosol mass spectrometer coupled with a light scattering module (LS-ToF-AMS). The instrument was deployed at the...

CCN activation experiments with adipic acid: effect of particle phase and adipic acid coatings on soluble and insoluble particles (2008)

Hings, S. S., Wrobel, W. C., Cross, E. S., Worsnop, D. R., Davidovits, P., Onasch, T. B.

Slightly soluble atmospherically relevant organic compounds, such as adipic acid, may influence particle CCN activity and therefore cloud formation. The 11 published experimental studies on the CCN...

CCN activation experiments with adipic acid: effect of particle phase and adipic acid coatings on soluble and insoluble particles (2008)

Hings, S. S., Wrobel, W. C., Cross, E. S., Worsnop, D. R., Davidovits, P., Onasch, T. B.

Slightly soluble atmospherically relevant organic compounds, such as adipic acid, may influence particle CCN activity and therefore cloud formation. The 11 published experimental studies on the CCN...

Spatial and temporal variability of particulate polycyclic aromatic hydrocarbons in Mexico City (2008)

D. A. Thornhill, B. De Foy, S. C. Herndon, T. B. Onasch, E. C. Wood, M. Zavala, ...

As part of the Megacities Initiative: Local and Global Research Observations (MILAGRO) study in the Mexico City Metropolitan Area in March 2006, we measured particulate polycyclic aromatic...

CCN activation experiments with adipic acid: effect of particle phase and adipic acid coatings on soluble and insoluble particles (2008)

S. S. Hings, W. C. Wrobel, E. S. Cross, D. R. Worsnop, P. Davidovits, T. B. Onasch

Slightly soluble atmospherically relevant organic compounds may influence particle CCN activity and therefore cloud formation. Adipic acid is a frequently employed surrogate for such slightly soluble...

CCN activation experiments with adipic acid: effect of particle phase and adipic acid coatings on soluble and insoluble particles (2008)

S. S. Hings, W. C. Wrobel, E. S. Cross, D. R. Worsnop, P. Davidovits, T. B. Onasch

Slightly soluble atmospherically relevant organic compounds, such as adipic acid, may influence particle CCN activity and therefore cloud formation. The 11 published experimental studies on the CCN...

Ozone production, nitrogen oxides, and radical budgets in Mexico City: observations from Pico de Tres Padres (2008)

E. C. Wood, S. C. Herndon, T. B. Onasch, J. H. Kroll, M. R. Canagaratna, C. E. Kolb, ...

Observations at a mountain-top site within the Mexico City basin are used to characterize ozone production and destruction, the nitrogen oxide budget, and the radical budget during the MILAGRO...

Emission and chemistry of organic carbon in the gas and aerosol phase at a sub-urban site near Mexico City in March 2006 during the MILAGRO study (2008)

D. Welsh-Bon, C. Warneke, W. C. Kuster, L. Alexander, A. K. Baker, ...

Volatile organic compounds (VOCs) and carbonaceous aerosol were measured at a sub-urban site near Mexico City in March of 2006 during the MILAGRO study (Megacity Initiative: Local and Global Research...

Single particle characterization using a light scattering module coupled to a time-of-flight aerosol mass spectrometer (2008)

E. S. Cross, T. B. Onasch, M. Canagaratna, J. T. Jayne, J. Kimmel, ...

We present the first single particle results obtained using an Aerodyne time-of-flight aerosol mass spectrometer coupled with a light scattering module (LS-ToF-AMS). The instrument was deployed at...

Technical Note: Use of a beam width probe in an Aerosol Mass Spectrometer to monitor particle collection efficiency in the field (2007)

D. Salcedo, T. B. Onasch, M. R. Canagaratna, K. Dzepina, J. A. Huffman, J. T. Jayne, ...

Two Aerodyne Aerosol Mass Spectrometers (Q-AMS) were deployed in Mexico City, during the Mexico City Metropolitan Area field study (MCMA-2003) from 29 March–4 May 2003 to investigate particle...

Particulate polycyclic aromatic hydrocarbon spatial variability and aging in Mexico City (2007)

Thornhill, D. A., Herndon, S. C., Onasch, T. B., Wood, E. C., Zavala, M., Molina, L. T., ...

As part of the Megacities Initiative: Local and Global Research Observations (MILAGRO) study in the Mexico City Metropolitan Area in March 2006, we measured particulate polycyclic aromatic...

Technical Note: Use of a beam width probe in an Aerosol Mass Spectrometer to monitor particle collection efficiency in the field (2007)

Salcedo, D., Onasch, T. B., Canagaratna, M. R., Dzepina, K., Huffman, J. A., Jayne, J. T., ...

Two Aerodyne Aerosol Mass Spectrometers (Q-AMS) were deployed in Mexico City, during the Mexico City Metropolitan Area field study (MCMA-2003) from 29 March?4 May 2003 to investigate particle...

Particulate polycyclic aromatic hydrocarbon spatial variability and aging in Mexico City (2007)

Thornhill, D. A., Herndon, S. C., Onasch, T. B., Wood, E. C., Zavala, M., Molina, L. T., ...

As part of the Megacities Initiative: Local and Global Research Observations (MILAGRO) study in the Mexico City Metropolitan Area in March 2006, we measured particulate polycyclic aromatic...

Technical Note: Use of a beam width probe in an Aerosol Mass Spectrometer to monitor particle collection efficiency in the field (2007)

Salcedo, D., Onasch, T. B., Canagaratna, M. R., Dzepina, K., Huffman, J. A., Jayne, J. T., ...

Two Aerodyne Aerosol Mass Spectrometers (Q-AMS) were deployed in Mexico City, during the Mexico City Metropolitan Area field study (MCMA-2003) from 29 March?4 May 2003 to investigate particle...

Technical Note: Use of a beam width probe in an Aerosol Mass Spectrometer to monitor particle collection efficiency in the field (2007)

Salcedo, D., Onasch, T. B., Canagaratna, M. R., Dzepina, K., Huffman, J. A., Jayne, J. T., ...

Chemical and microphysical characterization of ambient aerosols with the aerodyne aerosol mass spectrometer (2007)

Canagaratna, M. R., Jayne, J. T., Jimenez, J. L., Allan, J. D., Alfarra, M. R., Zhang, Q., ...

Particulate polycyclic aromatic hydrocarbon spatial variability and aging in Mexico City (2007)

D. A. Thornhill, S. C. Herndon, T. B. Onasch, E. C. Wood, M. Zavala, L. T. Molina, ...

As part of the Megacities Initiative: Local and Global Research Observations (MILAGRO) study in the Mexico City Metropolitan Area in March 2006, we measured particulate polycyclic aromatic...

Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry: results from the CENICA Supersite (2006)

D. Salcedo, T. B. Onasch, K. Dzepina, M. R. Canagaratna, Q. Zhang, J. A. Huffman, ...

An Aerodyne Aerosol Mass Spectrometer (AMS) was deployed at the CENICA Supersite, during the Mexico City Metropolitan Area field study (MCMA-2003) from 31 March-4 May 2003 to investigate particle...

Implementation of a Markov Chain Monte Carlo Method to inorganic aerosol modeling of observations from the MCMA-2003 Campaign. Part II: Model application to the CENICA, Pedregal and Santa Ana sites (2006)

San Martini, F. M., Dunlea, E. J., Volkamer, R., Onasch, T. B., Jayne, J. T., Canagaratna, M. R., ...

A Markov Chain Monte Carlo model for integrating the observations of inorganic species with a thermodynamic equilibrium model was presented in Part I of this series. Using observations taken at three...

Implementation of a Markov Chain Monte Carlo Method to inorganic aerosol modeling of observations from the MCMA-2003 Campaign. Part I: Model description and application to the La Merced Site (2006)

San Martini, F. M., Dunlea, E. J., Grutter, M., Onasch, T. B., Jayne, J. T., Canagaratna, M. R., ...

The equilibrium inorganic aerosol model ISORROPIA was embedded in a Markov Chain Monte Carlo algorithm to produce a powerful tool to analyze aerosol data and predict gas phase concentrations where...

Implementation of a Markov Chain Monte Carlo method to inorganic aerosol modeling of observations from the MCMA-2003 campaign ? Part II: Model application to the CENICA, Pedregal and Santa Ana sites (2006)

San Martini, F.M., Dunlea, E.J., Volkamer, R., Onasch, T.B., Jayne, J.T., Canagaratna, M.R., ...

A Markov Chain Monte Carlo model for integrating the observations of inorganic species with a thermodynamic equilibrium model was presented in Part I of this series. Using observations taken at three...

Implementation of a Markov Chain Monte Carlo method to inorganic aerosol modeling of observations from the MCMA-2003 campaign ? Part I: Model description and application to the La Merced site (2006)

San Martini, F.M., Dunlea, E.J., Grutter, M., Onasch, T.B., Jayne, J.T., Canagaratna, M.R., ...

The equilibrium inorganic aerosol model ISORROPIA was embedded in a Markov Chain Monte Carlo algorithm to develop a powerful tool to analyze aerosol data and predict gas phase concentrations where...

Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry: results from the CENICA Supersite (2006)

Salcedo, D., Onasch, T. B., Dzepina, K., Canagaratna, M. R., Zhang, Q., Huffman, J. A., ...

An Aerodyne Aerosol Mass Spectrometer (AMS) was deployed at the CENICA Supersite, during the Mexico City Metropolitan Area field study (MCMA-2003) from 31 March-4 May 2003 to investigate particle...

Implementation of a Markov Chain Monte Carlo Method to inorganic aerosol modeling of observations from the MCMA-2003 Campaign. Part II: Model application to the CENICA, Pedregal and Santa Ana sites (2006)

San Martini, F. M., Dunlea, E. J., Volkamer, R., Onasch, T. B., Jayne, J. T., Canagaratna, M. R., ...

A Markov Chain Monte Carlo model for integrating the observations of inorganic species with a thermodynamic equilibrium model was presented in Part I of this series. Using observations taken at three...

Implementation of a Markov Chain Monte Carlo Method to inorganic aerosol modeling of observations from the MCMA-2003 Campaign. Part I: Model description and application to the La Merced Site (2006)

San Martini, F. M., Dunlea, E. J., Grutter, M., Onasch, T. B., Jayne, J. T., Canagaratna, M. R., ...

The equilibrium inorganic aerosol model ISORROPIA was embedded in a Markov Chain Monte Carlo algorithm to produce a powerful tool to analyze aerosol data and predict gas phase concentrations where...

Implementation of a Markov Chain Monte Carlo method to inorganic aerosol modeling of observations from the MCMA-2003 campaign ? Part II: Model application to the CENICA, Pedregal and Santa Ana sites (2006)

San Martini, F.M., Dunlea, E.J., Volkamer, R., Onasch, T.B., Jayne, J.T., Canagaratna, M.R., ...

A Markov Chain Monte Carlo model for integrating the observations of inorganic species with a thermodynamic equilibrium model was presented in Part I of this series. Using observations taken at three...

Implementation of a Markov Chain Monte Carlo method to inorganic aerosol modeling of observations from the MCMA-2003 campaign ? Part I: Model description and application to the La Merced site (2006)

San Martini, F.M., Dunlea, E.J., Grutter, M., Onasch, T.B., Jayne, J.T., Canagaratna, M.R., ...

The equilibrium inorganic aerosol model ISORROPIA was embedded in a Markov Chain Monte Carlo algorithm to develop a powerful tool to analyze aerosol data and predict gas phase concentrations where...

Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry: results from the CENICA Supersite (2006)

Salcedo, D., Onasch, T. B., Dzepina, K., Canagaratna, M. R., Zhang, Q., Huffman, J. A., ...

An Aerodyne Aerosol Mass Spectrometer (AMS) was deployed at the CENICA Supersite, during the Mexico City Metropolitan Area field study (MCMA-2003) from 31 March-4 May 2003 to investigate particle...

Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry ? Part II: overview of the results at the CENICA supersite and comparison to previous studies (2005)

Salcedo, D., Dzepina, K., Onasch, T. B., Canagaratna, M. R., Jayne, J. T., Worsnop, D. R., ...

An Aerodyne Aerosol Mass Spectrometer (AMS) was deployed at the CENICA Supersite during the Mexico City Metropolitan Area field study from 31 March?4 May 2003. The AMS provides real time information...

Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry ? Part I: quantification, shape-related collection efficiency, and comparison with collocated instruments (2005)

Salcedo, D., Dzepina, K., Onasch, T. B., Canagaratna, M. R., Zhang, Q., Huffman, A. RR., ...

An Aerodyne Aerosol Mass Spectrometer (AMS) was deployed at the CENICA Supersite, while another was deployed in the Aerodyne Mobile Laboratory (AML) during the Mexico City Metropolitan Area field...

Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry ? Part II: overview of the results at the CENICA supersite and comparison to previous studies (2005)

Salcedo, D., Dzepina, K., Onasch, T. B., Canagaratna, M. R., Jayne, J. T., Worsnop, D. R., ...

An Aerodyne Aerosol Mass Spectrometer (AMS) was deployed at the CENICA Supersite during the Mexico City Metropolitan Area field study from 31 March?4 May 2003. The AMS provides real time information...

Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry ? Part I: quantification, shape-related collection efficiency, and comparison with collocated instruments (2005)

Salcedo, D., Dzepina, K., Onasch, T. B., Canagaratna, M. R., Zhang, Q., Huffman, A. RR., ...

An Aerodyne Aerosol Mass Spectrometer (AMS) was deployed at the CENICA Supersite, while another was deployed in the Aerodyne Mobile Laboratory (AML) during the Mexico City Metropolitan Area field...

Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry – Part I: quantification, shape-related collection efficiency, and comparison with collocated instruments (2005)

D. Salcedo, K. Dzepina, T. B. Onasch, M. R. Canagaratna, Q. Zhang, A.. R. Huffman, ...

An Aerodyne Aerosol Mass Spectrometer (AMS) was deployed at the CENICA Supersite, while another was deployed in the Aerodyne Mobile Laboratory (AML) during the Mexico City Metropolitan Area field...

Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry – Part II: overview of the results at the CENICA supersite and comparison to previous studies (2005)

D. Salcedo, K. Dzepina, T. B. Onasch, M. R. Canagaratna, J. T. Jayne, D. R. Worsnop, ...

An Aerodyne Aerosol Mass Spectrometer (AMS) was deployed at the CENICA Supersite during the Mexico City Metropolitan Area field study from 31 March–4 May 2003. The AMS provides real time...

A generalised method for the extraction of chemically resolved mass spectra from aerodyne aerosol mass spectrometer data (2004)

Allan, J. D., Delia, A. E., Coe, H., Bower, K. N., Alfarra, M. R., Jimenez, J. L., ...