Allan Bertram

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Allan Bertram

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Research and Teaching Interests

We focus on chemical and physical processes important in the atmosphere. Of special interest are atmospheric aerosol particles and the role they play in urban air pollution, climate change and atmospheric chemistry. Ultimately our goal is to better understand the role of human activity on the Earth'­s atmosphere.

Atmospheric aerosol particles, which range in size from 10 to 10,000 nanometers, can effect Earths climate by scattering or absorbing solar radiation and by modifying the nucleation and reflectivity of clouds. For example, a recent analysis suggests that a large portion of Arctic warming may be attributed to atmospheric soot, a type of atmospheric aerosol. Poorly understood from a scientific standpoint, atmospheric aerosols constitute one of the largest uncertainties in predicting future climate change. Aerosol particles also negatively affect air quality and are largely responsible for visibility reduction in urban environments. Elevated levels of aerosol particles are also strongly correlated with increased cardio-pulmonary morbidity, according to epidemiological studies.

Heterogeneous atmospheric chemistry

Over the past two decades, laboratory, fieldwork, and modeling studies have conclusively shown that interactions between gas-phase species and atmospheric aerosol particles (termed heterogeneous atmospheric chemistry) can significantly influence the chemistry of the atmosphere. One of the goals of our research is to identify key heterogeneous reactions that are important in the atmosphere. Atmospheric heterogeneous reactions are simulated and probed in the laboratory using aerosol reaction chambers, flow tube reactors, and state-of-the-art analytical techniques. From the laboratory data we determine fundamental kinetics and mechanisms of these reactions for incorporation into atmospheric models.

Aerosol mass spectrometry (instrument development)

Aerosol mass spectrometry has emerged as an extremely powerful technique for investigating organic and inorganic particles in both the field and the laboratory. Although the majority of aerosol mass spectrometers employ either a linear quadrupole or TOF-MS, ion trap mass spectrometers have been successfully used for single particle analysis. Another area of research in our group involves the development of new types of aerosol mass spectrometers that incorporate ion trap mass spectrometry. This project is a collaboration with Michael Blades and John Hepburn in the department of chemistry at UBC.

Aerosol mass spectrometry (field studies)

To assess the impact of Asian particulate pollution on Western Canada as well as general trends in background aerosol, a state-of-the-art single particle mass spectrometer designed and built at UBC is being deployed at Environment Canada'­s Whistler High Elevation site, located at the peak of Whistler Mountain, BC. This site offers the rare opportunity of nearly year-round measurements of tropospheric air unaffected by local background. This project is a collaboration with researchers at UBC (Allan Bertram and Ian McKendry), Environment Canada (Anne Marie MacDonald and Richard Leaitch) and Pacific Northwest National Laboratory (Daniel Cziczo).

Kinetics and mechanisms of ice nucleation in the atmosphere (laboratory studies)

Ice clouds in the troposphere play a key role in the Earths climate system by strongly influencing the Earth­s radiative properties. These clouds form when ice nucleates on or in aerosol particles in the troposphere. Another area of research in our group focuses on understanding the mechanisms and determining the kinetics of these processes. Results from this project should provide building blocks for accurately representing ice clouds in climate models.

Ice nucleation (computer simulations)

The ice nucleation studies in our laboratory have also led to a collaboration with Gren Patey (UBC) involving computer simulations to better understand and predict ice nucleation on a molecular level. Currently we are investigating ice nucleation on mineral dust surfaces containing defects such as steps, edges, and cracks using these simulations.

Hygroscopic properties and phase transitions of atmospheric aerosols

Atmospheric aerosol particles can undergo several types of phase transitions. Two types of atmospherically relevant phase transitions are deliquescence and efflorescence. We are currently studying these phase transitions for a range of atmospheric conditions to incorporate into atmospheric models. A wide range of instruments are being used for these studies including optical microscopy, FTIR microscopy and an electrodynamic balance.

Viscosity of atmospheric particles

The viscosity of aerosol particles is a fundamental property that is currently poorly quantified. However, information on the viscosity of these particles is required for accurate predictions of particle growth, mass and removal, all of which are closely connected to air quality and climate predictions. To quantify the viscosities of aerosol particles, we developed two new techniques, namely a bead mobility technique and a poke-flow technique combined with fluid simulations. Using these techniques, we determine the viscosities of aerosol particles as a function of relative humidity. Moreover, we apply this new data to predictions of air quality, visibility, and climate.

Ice nuclei (field studies)

Ice nucleation studies extend to field sites in Canada and abroad. Several projects involve collaborative work as part of the Network on Climate and Aerosols: Addressing Key Uncertainties in Remote Canadian Environments (NETCARE). In France, the BIODETECT 2014 summer campaign focused on aerosols from biological origin (bacteria, fungi, pollen). Aerosol particles from these field sites are collected and characterized for their ice nucleation ability, INP concentrations, and composition.

For more information on specific projects please see the Bertram Group Homepage

Bertram Group Homepage 

Also if you are interested in graduate studies at UBC, you may want to consider applying to the new NSERC-CREATE-Atmospheric Aerosol Program. This program has several unique opportunities including fellowships, travel support and internships.

NSERC-CREATE-Atmospheric Aerosol Program

Contact

Real name: 
Email: 
Office Room Number(s): 
Chemistry E222
Office Phone Number: 
604-822-2113
Lab Room: 
D240
Fax Number: 
604-822-2847

Curriculum Vitae

Director of NSERC-CREATE-Atmospheric Aerosol Program (2010-present); CIC Environment Division R&D Dima Award Winner (2016); Canada Research Chair of Environmental and Atmospheric Chemistry (2001-2011); NSERC Postdoctoral Fellow, Massachusetts Institute of Technology (Mario Molina, 1998-2000); W.B. Pearson Medal (1998); Ph.D., University of Waterloo (James Sloan, 1998); B.Sc., University of Prince Edward Island (1993)

Publications

2015

Schroder, J. C. ; Hanna, S. J. ; Modini, R. L. ; Corrigan, A. L. ; Kreidenwies, S. M. ; Macdonald, A. M. ; Noone, K. J. ; Russell, L. M. ; Leaitch, W. R. ; Bertram, A. K. Size-Resolved Observations Of Refractory Black Carbon Particles In Cloud Droplets At A Marine Boundary Layer Site. ATMOSPHERIC CHEMISTRY AND PHYSICS 2015, 15, 1367-1383.
Wilson, T. W. ; Ladino, L. A. ; Alpert, P. A. ; Breckels, M. N. ; Brooks, I. M. ; Browse, J. ; Burrows, S. M. ; Carslaw, K. S. ; J. Huffman, A. ; Judd, C. ; Kilthau, W. P. ; Mason, R. H. ; McFiggans, G. ; Miller, L. A. ; Najera, J. J. ; Polishchuk, E. ; Rae, S. ; Schiller, C. L. ; Si, M. ; Temprado, J. Vergara; Whale, T. F. ; Wong, J. P. S. ; Wurl, O. ; Yakobi-Hancock, J. D. ; Abbatt, J. P. D. ; Aller, J. Y. ; Bertram, A. K. ; Knopf, D. A. ; Murray, B. J. A Marine Biogenic Source Of Atmospheric Ice-Nucleating Particles. NATURE 2015, 525, 234+.
Zielke, S. A. ; Bertram, A. K. ; Patey, G. N. A Molecular Mechanism Of Ice Nucleation On Model Agl Surfaces. JOURNAL OF PHYSICAL CHEMISTRY B 2015, 119, 9049-9055.
Li, Y. J. ; Liu, P. ; Gong, Z. ; Wang, Y. ; Bateman, A. ; Bergoend, C. ; Bertram, A. ; Martin, S. Chemical Reactivity And Liquid/non-Liquid States Of Secondary Organic Material. Environmental Science & Technology 2015.
Mason, R. H. ; Si, M. ; Li, J. ; Chou, C. ; Dickie, R. ; Toom-Sauntry, D. ; Pöhlker, C. ; Yakobi-Hancock, J. D. ; Ladino, L. A. ; Jones, K. ; Leaitch, W. R. ; Schiller, C. L. ; Abbatt, J. P. D. ; Huffman, J. A. ; Bertram, A. K. Ice Nucleating Particles At A Coastal Marine Boundary Layer Site: Correlations With Aerosol Type And Meteorological Conditions. Atmospheric Chemistry and Physics 2015, 15, 12547-12566.
Modini, R. L. ; Frossard, A. A. ; Ahlm, L. ; Russell, L. M. ; Corrigan, C. E. ; Roberts, G. C. ; Hawkins, L. N. ; Schroder, J. C. ; Bertram, A. K. ; Zhao, R. ; Lee, A. K. Y. ; Abbatt, J. P. D. ; Lin, J. ; Nenes, A. ; Wang, Z. ; Wonaschuetz, A. ; Sorooshian, A. ; Noone, K. J. ; Jonsson, H. ; Seinfeld, J. H. ; Toom-Sauntry, D. ; Macdonald, A. M. ; Leaitch, W. R. Primary Marine Aerosol-Cloud Interactions Off The Coast Of California. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 2015, 120, 4282-4303.
Mason, R. H. ; Si, M. ; Chou, C. ; Irish, V. E. ; Dickie, R. ; Elizondo, P. ; Wong, R. ; Brintnell, M. ; Elsasser, M. ; Lassar, W. M. ; Pierce, K. M. ; Leaitch, W. R. ; MacDonald, A. M. ; Platt, A. ; Toom-Sauntry, D. ; Sarda-Estève, R. ; Schiller, C. L. ; Suski, K. J. ; Hill, T. C. J. ; Abbatt, J. P. D. ; Huffman, J. A. ; DeMott, P. J. ; Bertram, A. K. Size-Resolved Measurements Of Ice Nucleating Particles At Six Locations In North America And One In Europe. Atmospheric Chemistry and Physics Discussions 2015, 15, 20521-20559.
Wheeler, M. J. ; Mason, R. H. ; Steunenberg, K. ; Wagstaff, M. ; Chou, C. ; Bertram, A. K. Immersion Freezing Of Supermicron Mineral Dust Particles: Freezing Results, Testing Different Schemes For Describing Ice Nucleation, And Ice Nucleation Active Site Densities. JOURNAL OF PHYSICAL CHEMISTRY A 2015, 119, 4358-4372.
Zhang, Y. ; Sanchez, M. S. ; Douet, C. ; Wang, Y. ; Bateman, A. P. ; Gong, Z. ; Kuwata, M. ; Renbaum-Wolff, L. ; Sato, B. B. ; Liu, P. F. ; Bertram, A. K. ; Geiger, F. M. ; Martin, S. T. Changing Shapes And Implied Viscosities Of Suspended Submicron Particles. Atmospheric Chemistry and Physics 2015, 15, 7819-7829.
Bateman, A. P. ; Bertram, A. K. ; Martin, S. T. Hygroscopic Influence On The Semisolid-To-Liquid Transition Of Secondary Organic Materials. JOURNAL OF PHYSICAL CHEMISTRY A 2015, 119, 4386-4395.
Zielke, S. ; Bertram, A. ; Patey, G. Simulations Of Ice Nucleation By Kaolinite (001) With Rigid And Flexible Surfaces. The Journal of Physical Chemistry Part B: Biophysical Chemistry, Biomaterials, Liquids, and Soft Matter 2015, Accepted.
Sellier, M. ; Grayson, J. W. ; Renbaum-Wolff, L. ; Song, M. ; Bertram, A. K. Estimating The Viscosity Of A Highly Viscous Liquid Droplet Through The Relaxation Time Of A Dry Spot. JOURNAL OF RHEOLOGY 2015, 59, 733-750.
Bateman, A. ; Gong, Z. ; Liu, P. ; Sato, B. ; Cirino, G. ; Zhang, Y. ; Artaxo, P. ; Bertram, A. ; Manzi, A. ; Rizzo, L. ; Souza, R. ; Zaveri, R. ; Martin, S. Submicron Particulate Matter Is Primarily In Liquid Form Over Amazon Rain Forest. Nature Geoscience 2015, Accepted.
O'Brien, R. E. ; Wang, B. ; Kelly, S. T. ; Lundt, N. ; You, Y. ; Bertram, A. K. ; Leone, S. R. ; Laskin, A. ; Gilles, M. K. Liquid-Liquid Phase Separation In Aerosol Particles: Imaging At The Nanometer Scale. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015, 49, 4995-5002.
Montgomery, J. F. ; Rogak, S. N. ; Green, S. I. ; You, Y. ; Bertram, A. K. Structural Change Of Aerosol Particle Aggregates With Exposure To Elevated Relative Humidity. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015, 49, 12054-12061.
Price, H. C. ; Mattsson, J. ; Zhang, Y. ; Bertram, A. K. ; Davies, J. F. ; Grayson, J. W. ; Martin, S. T. ; O'Sullivan, D. ; Reid, J. P. ; Rickards, A. M. J. ; Murray, B. J. Water Diffusion In Atmospherically Relevant Alpha-Pinene Secondary Organic Material. CHEMICAL SCIENCE 2015, 6, 4876-4883.
Mason, R. H. ; Chou, C. ; McCluskey, C. S. ; Levin, E. J. T. ; Schiller, C. L. ; Hill, T. C. J. ; Huffman, J. A. ; DeMott, P. J. ; Bertram, A. K. The Micro-Orifice Uniform Deposit Impactor-Droplet Freezing Technique (Moudi-Dft) For Measuring Concentrations Of Ice Nucleating Particles As A Function Of Size: Improvements And Initial Validation. ATMOSPHERIC MEASUREMENT TECHNIQUES 2015, 8, 2449-2462.
Grayson, J. W. ; Song, M. ; Sellier, M. ; Bertram, A. K. Validation Of The Poke-Flow Technique Combined With Simulations Of Fluid Flow For Determining Viscosities In Samples With Small Volumes And High Viscosities. ATMOSPHERIC MEASUREMENT TECHNIQUES 2015, 8, 2463-2472.
Song, M. ; Liu, P. F. ; Hanna, S. J. ; Li, Y. J. ; Martin, S. T. ; Bertram, A. K. Relative Humidity-Dependent Viscosities Of Isoprene-Derived Secondary Organic Material And Atmospheric Implications For Isoprene-Dominant Forests. ATMOSPHERIC CHEMISTRY AND PHYSICS 2015, 15, 5145-5159.

2014

Zhao, R. ; Lee, A. K. Y. ; Wentzell, J. J. B. ; Mcdonald, A. M. ; Toom-Sauntry, D. ; Leaitch, W. R. ; Modini, R. L. ; Corrigan, A. L. ; Russell, L. M. ; Noone, K. J. ; Schroder, J. C. ; Bertram, A. K. ; Hawkins, L. N. ; Abbatt, J. P. D. ; Liggio, J. Cloud Partitioning Of Isocyanic Acid (Hnco) And Evidence Of Secondary Source Of Hnco In Ambient Air. GEOPHYSICAL RESEARCH LETTERS 2014, 41, 6962-6969.
You, Y. ; Smith, M. L. ; Song, M. ; Martin, S. T. ; Bertram, A. K. Liquid-Liquid Phase Separation In Atmospherically Relevant Particles Consisting Of Organic Species And Inorganic Salts. International Reviews in Physical Chemistry 2014, 33, 43-77.
Haga, D. I. ; Burrows, S. M. ; Iannone, R. ; Wheeler, M. J. ; Mason, R. H. ; Chen, J. ; Polishchuk, E. A. ; Poschl, U. ; Bertram, A. K. Ice Nucleation And Its Effect On The Atmospheric Transport Of Fungal Spores From The Classes Agaricomycetes, Ustilaginomycetes, And Eurotiomycetes. Atmospheric Chemistry and Physics 2014, 14, 8611-8630.
Yakobi-Hancock, J. D. ; Ladino, L. A. ; Bertram, A. K. ; Huffman, J. A. ; Jones, K. ; Leaitch, W. R. ; Mason, R. H. ; Schiller, C. L. ; Toom-Sauntry, D. ; Wong, J. P. S. ; Abbatt, J. P. D. Ccn Activity Of Size-Selected Aerosol At A Pacific Coastal Location. Atmospheric Chemistry and Physics 2014, 14, 12307-12317.

2013

Haga, D. I. ; Iannone, R. ; Wheeler, M. J. ; Mason, R. ; Polishchuk, E. A. ; Fetch, Jr., T. ; van der Kamp, B. J. ; McKendry, I. G. ; Bertram, A. K. Ice Nucleation Properties Of Rust And Bunt Fungal Spores And Their Transport To High Altitudes, Where They Can Cause Heterogeneous Freezing. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 2013, 118, 7260-7272.
Leaitch, W. R. ; Sharma, S. ; Huang, L. ; Toom-Sauntry, D. ; Chivulescu, A. ; Macdonald, A. M. ; vonSalzen, K. ; Pierce, J. R. ; Bertram, A. K. ; Schroder, J. C. ; Shantz, N. C. ; Chang, R. Y. - W. ; Norman, A. - L. Dimethyl Sulfide Control Of The Lean Summertime Arctic Aerosol And Cloud. Elementa: Science of the Anthropocene 2013, 1, 000017 .
Renbaum-Wolff, L. ; Grayson, J. W. ; Bateman, A. P. ; Kuwata, M. ; Sellier, M. ; Murray, B. J. ; Shilling, J. E. ; Martin, S. T. ; Bertram, A. K. Viscosity Of Alpha-Pinene Secondary Organic Material And Implications For Particle Growth And Reactivity. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 2013, 110, 8014-8019.
Girard, E. ; Dueymes, G. ; Du, P. ; Bertram, A. K. Assessment Of The Effects Of Acid-Coated Ice Nuclei On The Arctic Cloud Microstructure, Atmospheric Dehydration, Radiation And Temperature During Winter. INTERNATIONAL JOURNAL OF CLIMATOLOGY 2013, 33, 599-614.
Huffman, J. A. ; Prenni, A. J. ; DeMott, P. J. ; Poehlker, C. ; Mason, R. H. ; Robinson, N. H. ; Froehlich-Nowoisky, J. ; Tobo, Y. ; Despres, V. R. ; Garcia, E. ; Gochis, D. J. ; Harris, E. ; Mueller-Germann, I. ; Ruzene, C. ; Schmer, B. ; Sinha, B. ; Day, D. A. ; Andreae, M. O. ; Jimenez, J. L. ; Gallagher, M. ; Kreidenweis, S. M. ; Bertram, A. K. ; Poeschl, U. High Concentrations Of Biological Aerosol Particles And Ice Nuclei During And After Rain. ATMOSPHERIC CHEMISTRY AND PHYSICS 2013, 13, 6151-6164.
Shiraiwa, M. ; Zuend, A. ; Bertram, A. K. ; Seinfeld, J. H. Gas-Particle Partitioning Of Atmospheric Aerosols: Interplay Of Physical State, Non-Ideal Mixing And Morphology. PHYSICAL CHEMISTRY CHEMICAL PHYSICS 2013, 15, 11441-11453.
Renbaum-Wolff, L. ; Grayson, J. W. ; Bertram, A. K. Technical Note: New Methodology For Measuring Viscosities In Small Volumes Characteristic Of Environmental Chamber Particle Samples. ATMOSPHERIC CHEMISTRY AND PHYSICS 2013, 13, 791-802.

2012

You, Y. ; Renbaum-Wolff, L. ; Carreras-Sospedra, M. ; Hanna, S. J. ; Hiranuma, N. ; Kamal, S. ; Smith, M. L. ; Zhang, X. ; Weber, R. J. ; Shilling, J. E. ; Dabdub, D. ; Martin, S. T. ; Bertram, A. K. Images Reveal That Atmospheric Particles Can Undergo Liquid-Liquid Phase Separations. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 2012, 109, 13188-13193.
Smith, M. L. ; Bertram, A. K. ; Martin, S. T. Deliquescence, Efflorescence, And Phase Miscibility Of Mixed Particles Of Ammonium Sulfate And Isoprene-Derived Secondary Organic Material. ATMOSPHERIC CHEMISTRY AND PHYSICS 2012, 12, 9613-9628.

2011

Iannone, R. ; Chernoff, D. I. ; Pringle, A. ; Martin, S. T. ; Bertram, A. K. The Ice Nucleation Ability Of One Of The Most Abundant Types Of Fungal Spores Found In The Atmosphere. Atmospheric Chemistry and Physics 2011, 11.
Du, P. ; Girard, E. ; Bertram, A. K. ; Shupe, M. D. Modeling Of The Cloud And Radiation Processes Observed During Sheba. Atmospheric Research 2011, 101.
Iannone, R. ; Xiao, S. ; Bertram, A. K. Potentially Important Nighttime Heterogeneous Chemistry: No3 With Aldehydes And N2O5 With Alcohols. Physical Chemistry Chemical Physics 2011, 13.
Yang, Z. ; Bertram, A. K. ; Chou, K. C. Why Do Sulfuric Acid Coatings Influence The Ice Nucleation Properties Of Mineral Dust Particles In The Atmosphere?. Journal of Physical Chemistry Letters 2011, 2.

2010

Chernoff, D. I. ; Bertram, A. K. Effects Of Sulfate Coatings On The Ice Nucleation Properties Of A Biological Ice Nucleus And Several Types Of Minerals. Journal of Geophysical Research, [Atmospheres] 2010, 115, D20205/1-D20205/12.
Bodsworth, A. ; Zobrist, B. ; Bertram, A. K. Inhibition Of Efflorescence In Mixed Organic-Inorganic Particles At Temperatures Less Than 250 K. Physical Chemistry Chemical Physics 2010, 12, 12259 - 12266.
Croteau, T. ; Bertram, A. K. ; Patey, G. N. Observations Of High-Density Ferroelectric Ordered Water In Kaolinite Trenches Using Monte Carlo Simulations. Journal of Physical Chemistry A 2010, 114, 8396 - 8405.
Simpson, E. A. ; Campuzano-Jost, P. ; Hanna, S. J. ; Kanan, K. M. M. ; Hepburn, J. W. ; Blades, M. W. ; Bertram, A. K. Studies Of One And Two Component Aerosols Using Ir/vuv Single Particle Mass Spectrometry: Insights Into The Vaporization Process And Quantitative Limitations. Physical Chemistry Chemical Physics 2010, 12, 11565 - 11575.
Croteau, T. ; Bertram, A. K. ; Patey, G. N. Water Adsorption On Kaolinite Surfaces Containing Trenches. Journal of Physical Chemistry A 2010, 114, 2171 - 2178.
McKendry, I. G. ; Gallagher, J. ; P. Jost, C. ; Bertram, A. ; Strawbridge, K. ; Leaitch, R. ; Macdonald, A. M. Ground-Based Remote Sensing Of An Elevated Forest Fire Aerosol Layer At Whistler, Bc: Implications For Interpretation Of Mountaintop Chemistry. ATMOSPHERIC CHEMISTRY AND PHYSICS 2010, 10, 11921-11930.

2009

Eastwood, M. L. ; Cremel, S. ; Wheeler, M. ; Murray, B. J. ; Girard, E. ; Bertram, A. K. Effects Of Sulfuric Acid And Ammonium Sulfate Coatings On The Ice Nucleation Properties Of Kaolinite Particles. Geophysical Research Letters 2009, 36, 5.
Hanna, S. J. ; Campuzano-Jost, P. ; Simpson, E. A. ; Robb, D. B. ; Burak, I. ; Blades, M. W. ; Hepburn, J. W. ; Bertram, A. K. A New Broadly Tunable (7.4-10.2 Ev) Laser Based Vuv Light Source And Its First Application To Aerosol Mass Spectrometry. International Journal of Mass Spectrometry 2009, 279, 134-146.
Gross, S. ; Bertram, A. K. Products And Kinetics Of The Reactions Of An Alkane Monolayer And A Terminal Alkene Monolayer With No3 Radicals. Journal of Geophysical Research-Atmospheres 2009, 114, 14.
Simpson, E. A. ; Campuzano-Jost, P. ; Hanna, S. J. ; Robb, D. B. ; Hepburn, J. H. ; Blades, M. W. ; Bertram, A. K. A Laser Desorption-Electron Impact Ionization Ion Trap Mass Spectrometer For Real-Time Analysis Of Single Atmospheric Particles. International Journal of Mass Spectrometry 2009, 281, 140-149.
Gross, S. ; Iannone, R. ; Xiao, S. ; Bertram, A. K. Reactive Uptake Studies Of No3 And N2O5 On Alkenoic Acid, Alkanoate, And Polyalcohol Substrates To Probe Nighttime Aerosol Chemistry. Physical Chemistry Chemical Physics 2009, 11, 7792-7803.
Hanna, S. J. ; Campuzano-Jost, P. ; Simpson, E. A. ; Burak, I. ; Blades, M. W. ; Hepburn, J. W. ; Bertram, A. K. A Study Of Oleic Acid And 2,4-Dhb Acid Aerosols Using An Ir-Vuv-Itms: Insights Into The Strengths And Weaknesses Of The Technique. Physical Chemistry Chemical Physics 2009, 11, 7963-7975.
Croteau, T. ; Bertram, A. K. ; Patey, G. N. Simulation Of Water Adsorption On Kaolinite Under Atmospheric Conditions. Journal of Physical Chemistry A 2009, 113, 7826-7833.
Signorell, R. ; Bertram, A. K. Physical Chemistry Of Aerosols. PHYSICAL CHEMISTRY CHEMICAL PHYSICS 2009, 11, 7759.

2008

Croteau, T. ; Bertram, A. K. ; Patey, G. N. Adsorption And Structure Of Water On Kaolinite Surfaces: Possible Insight Into Lee Nucleation From Grand Canonical Monte Carlo Calculations. Journal of Physical Chemistry A 2008, 112, 10708-10712.
Eastwood, M. L. ; Cremel, S. ; Gehrke, C. ; Girard, E. ; Bertram, A. K. Ice Nucleation On Mineral Dust Particles: Onset Conditions, Nucleation Rates And Contact Angles. Journal of Geophysical Research-Atmospheres 2008, 113, 9.
Cosman, L. M. ; Bertram, A. K. Reactive Uptake Of N2O5 On Aqueous H2So4 Solutions Coated With 1-Component And 2-Component Monolayers. Journal of Physical Chemistry A 2008, 112, 4625-4635.
Cosman, L. M. ; Knopf, D. A. ; Bertram, A. K. N2O5 Reactive Uptake On Aqueous Sulfuric Acid Solutions Coated With Branched And Straight-Chain Insoluble Organic Surfactants. Journal of Physical Chemistry A 2008, 112, 2386-2396.
Gross, S. ; Bertram, A. K. Reactive Uptake Of No3, N2O5, No2, Hno3, And O-3 On Three Types Of Polycyclic Aromatic Hydrocarbon Surfaces. Journal of Physical Chemistry A 2008, 112, 3104-3113.
Murray, B. J. ; Bertram, A. K. Inhibition Of Solute Crystallisation In Aqueous H+-Nh4+-So42–H2O Droplets. Physical Chemistry Chemical Physics 2008, 10, 3287-3301.

2007

Murray, B. J. ; Bertram, A. K. Laboratory Studies Of The Formation Of Cubic Ice In Aqueous Droplets. In Physics and Chemistry of Ice; Kuhs, W. F. ; Physics and Chemistry of Ice; 2007; pp. 417-426.
Knopf, D. A. ; Cosman, L. M. ; Mousavi, P. ; Mokamati, S. ; Bertram, A. K. A Novel Flow Reactor For Studying Reactions On Liquid Surfaces Coated By Organic Monolayers: Methods, Validation, And Initial Results. Journal of Physical Chemistry A 2007, 111, 11021-11032.
Mak, J. ; Gross, S. ; Bertram, A. K. Uptake Of No3 On Soot And Pyrene Surfaces. Geophysical Research Letters 2007, 34.
Ivanov, A. V. ; Trakhtenberg, S. ; Bertram, A. K. ; Gershenzon, Y. M. ; Molina, M. J. Oh, Ho2, And Ozone Gaseous Diffusion Coefficients. Journal of Physical Chemistry A 2007, 111, 1632-1637.
Murray, B. J. ; Bertram, A. K. Strong Dependence Of Cubic Ice Formation On Droplet Ammonium To Sulfate Ratio. Geophysical Research Letters 2007, 34.

2006

Knopf, D. A. ; Mak, J. ; Gross, S. ; Bertram, A. K. Does Atmospheric Processing Of Saturated Hydrocarbon Surfaces By No3 Lead To Volatilization?. Geophysical Research Letters 2006, 33, 5.
Shilling, J. E. ; Tolbert, M. A. ; Toon, O. B. ; Jensen, E. J. ; Murray, B. J. ; Bertram, A. K. Measurements Of The Vapor Pressure Of Cubic Ice And Their Implications For Atmospheric Ice Clouds. Geophysical Research Letters 2006, 33, 5.
Parsons, M. T. ; Riffell, J. L. ; Bertram, A. K. Crystallization Of Aqueous Inorganic-Malonic Acid Particles: Nucleation Rates, Dependence On Size, And Dependence On The Ammonium-To-Sulfate. Journal of Physical Chemistry A 2006, 110, 8108-8115.
Dymarska, M. ; Murray, B. J. ; Sun, L. M. ; Eastwood, M. L. ; Knopf, D. A. ; Bertram, A. K. Deposition Ice Nucleation On Soot At Temperatures Relevant For The Lower Troposphere. Journal of Geophysical Research-Atmospheres 2006, 111, 9.
Murray, B. J. ; Bertram, A. K. Formation And Stability Of Cubic Ice In Water Droplets. Physical Chemistry Chemical Physics 2006, 8, 186-192.

2005

Murray, B. J. ; Knopf, D. A. ; Bertram, A. K. The Formation Of Cubic Ice Under Conditions Relevant To Earth’S Atmosphere. Nature 2005, 434, 202-205.
Knopf, D. A. ; Anthony, L. M. ; Bertram, A. K. Reactive Uptake Of O-3 By Multicomponent And Multiphase Mixtures Containing Oleic Acid. Journal of Physical Chemistry A 2005, 109, 5579-5589.

2004

Parsons, M. T. ; Mak, J. ; Lipetz, S. R. ; Bertram, A. K. Deliquescence Of Malonic, Succinic, Glutaric, And Adipic Acid Particles. Journal of Geophysical Research-Atmospheres 2004, 109, 8.
Pant, A. ; Fok, A. ; Parsons, M. T. ; Mak, J. ; Bertram, A. K. Deliquescence And Crystallization Of Ammonium Sulfate-Glutaric Acid And Sodium Chloride-Glutaric Acid Particles. Geophysical Research Letters 2004, 31, 4.
Parsons, M. T. ; Knopf, D. A. ; Bertram, A. K. Deliquescence And Crystallization Of Ammonium Sulfate Particles Internally Mixed With Water-Soluble Organic Compounds. Journal of Physical Chemistry A 2004, 108, 11600-11608.

2003

2002

Zuberi, B. ; Bertram, A. K. ; Cassa, C. A. ; Molina, L. T. ; Molina, M. J. Heterogeneous Nucleation Of Ice In (Nh4)(2)So4-H2O Particles With Mineral Dust Immersions. Geophysical Research Letters 2002, 29.

2001

Zuberi, B. ; Bertram, A. K. ; Koop, T. ; Molina, L. T. ; Molina, M. J. Heterogeneous Freezing Of Aqueous Particles Induced By Crystallized (Nh4)(2)So4, Ice, And Letovicite. Journal of Physical Chemistry A 2001, 105.
Bertram, A. K. ; Ivanov, A. V. ; Hunter, M. ; Molina, L. T. ; Molina, M. J. The Reaction Probability Of Oh On Organic Surfaces Of Tropospheric Interest. Journal of Physical Chemistry A 2001, 105.

2000

Bertram, A. K. ; Dickens, D. B. ; Sloan, J. J. Supercooling Of Type 1 Polar Stratospheric Clouds: The Freezing Of Submicron Nitric Acid Aerosols Having Hno3 Mol Fractions Less Than 0.5. Journal of Geophysical Research - Atmospheres 2000, 105.
Bertram, A. K. ; Koop, T. ; Molina, L. T. ; Molina, M. J. Ice Formation In (Nh4)(2)So4-H2O Particles. Journal of Physical Chemistry A 2000, 104.

1999

Koop, T. ; Bertram, A. K. ; Molina, L. T. ; Molina, M. J. Phase Transitions In Aqueous Nh4Hso4 Solutions. Journal of Physical Chemistry A 1999, 103.

1998

Bertram, A. K. ; Sloan, J. J. The Nucleation Rate Constants And Freezing Mechanism Of Nitric Acid Trihydrate Aerosol Under Stratospheric Conditions. Journal of Geophysical Research - Atmospheres 1998, 103.

1996

Bertram, A. K. ; Patterson, D. D. ; Sloan, J. J. Mechanisms And Temperatures For The Freezing Of Sulfuric Acid Aerosols Measured By Ftir Extinction Spectroscopy. Journal of Physical Chemistry 1996, 100.

1993

Bertram, A. K. ; Liu, M. T. H. Cycloaddition Of Arylchlorocarbenes Using Ultrasound. Journal of the Chemical Society - Chemical Communications 1993.