个人简介

Director of NSERC-CREATE-Atmospheric Aerosol Program (2010-present); 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)

研究领域

Analytical Chemistry; Environmental Chemistry; Physical & Theoretical Chemistry

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

近期论文

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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.BibTex 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 By Fungal Spores From The Classes Agaricomycetes, Ustilaginomycetes, And Eurotiomycetes, And The Effect On The Atmospheric Transport Of These Spores. Atmospheric Chemistry and Physics 2014, 14, 8611-8630.BibTex 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.BibTex Schroder, J. K. ; Hanna, S. J. ; Modini, R. L. ; Corrigan, A. L. ; 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 Discussions 2014, 14, 11447-11491.BibTex You, Y. ; Bertram, A. K. Effects Of Molecular Weight And Temperature On Liquid-Liquid Phase Separation In Particles Containing Organic Species And Ammonium Sulfate. Atmospheric Chemistry and Physics Discussions 2014, 14, 23341-23373.BibTex 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 2014.BibTex 2013 You, Y. L. ; Renbaum-Wolff, L. ; Bertram, A. K. Liquid-Liquid Phase Separation In Particles Containing Organics Mixed With Ammonium Sulfate, Ammonium Bisulfate, Ammonium Nitrate Or Sodium Chloride. Atmospheric Chemistry and Physics 2013, 13, 11723-11734.BibTex M. Smith, et.al. Phase Transitions And Phase Miscibility Of Mixed Particles Of Ammonium Sulfate, Toluene-Derived Secondary Organic Material, And Water. The Journal of Physical Chemistry 2013, 117, 8895-8906.BibTex You, Y. ; Renbaum-Wolff, L. ; Bertram, A. K. Liquid–Liquid Phase Separation In Particles Containing Organics Mixed With Ammonium Sulfate, Ammonium Bisulfate, Ammonium Nitrate Or Sodium Chloride. . Atmospheric Chemistry and Physics 2013, 13, 11723-11734.BibTex 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.BibTex 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.BibTex 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.BibTex 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.BibTex