Atmospheric Integrated Research at University of California, Irvine

Chemistry, Processes, and Measurements

Annmarie Carlton

Contact Information

UC Irvine Department of Chemistry
1102 Natural Sciences 2
Irvine, CA 92697-2025
Office: 380-B Rowland Hall



  • Associate Professor, Dept. of Chemistry, University of California, Irvine CA (2016-present)
  • Assistant Professor, Dept. of Environmental Sciences, Rutgers University, New Brunswick, NJ 92010-20160
  • Research Physical Scientist, U.S. EPA, Office of Research and Development, RTP, NC 92008-20100
  • Research Physical Scientist, NOAA, Air Resources Laboratory, Research Triangle Park, NC 92006-20080


  • Ph.D., Environmental Science, Rutgers University, New Brunswick, NJ Oct. (2006)
  • M.S., Bioresource Engineering, Rutgers University, New Brunswick, NJ May (1999)
  • B.S., Bioenvironmental Engineering, Rutgers University-College of Engineering, Piscataway, NJ (May 1995)


  • Environmental Engineer, U.S. Environmental Protection Agency – Region 2, New York and NJ (1996-2002)
  • Southern Oxidant and Aerosol Study (SOAS): a lead investigator (20+ PI effort) for large NSF/NOAA/EPA/EPRI supported field study in the southeast U.S.
Research Interests: 

Anthropogenic emissions and their chemical transformation during atmospheric transport drive critical issues surrounding air quality and climate change.  Professor Carlton conducts atmospheric modeling, as well as organizing and conducting field and laboratory studies to investigate these topics.  The ultimate goal of this research is to inform policymakers in order that society can develop effective strategies that protect human health, ecosystems, agricultural economies, and security.  Specific interests include:

  • formation of secondary organic aerosol through cloud processing and aerosol water chemistry
  • 3-dimensional photochemical modeling for air quality and climate with emphasis on atmospheric aqueous chemistry
  • formation of secondary organic aerosol through cloud processing
  • aerosol-cloud interactions
  • biogenic and anthropogenic influences on climate and air quality
  • atmospheric processing of pollution

Dr. Carlton was the scientific leader of the SOAS campaign, member of the ACCORD Science Committee at the National Center for Atmospheric Research, and member of the National Research Committee tasked with identifying priorities and strategic steps forward for atmospheric chemistry research over the coming decades.

Selected Honors and Awards: 
U.S.EPA –Science Advisory Board: Level II Science and Technology Achievement Award 2012
American Association of Women Geoscientists (AWG) – Distinguished Lecturer 2011; 2012
U.S.EPA National Honor Award (Bronze Medal) for CMAQ Model Development 2010
U.S.EPA-National Exposure Research Laboratory, Special Achievement in Atmospheric Chemistry 2010
Distinguished Alumnus (early career) Rutgers University 2009
U.S.EPA-ORD National Honor Award for CMAQ Development 2009
U.S.EPA National Honor Award (Gold Medal) for Air Quality Forecasting 2009
Emerging scientist award: Gordon Conference on Biogenics and the Atmosphere 2007
Atmospheric Chemistry Colloquium for Emerging Senior Scientists (ACCESS VIII)

Manabu Shiraiwa

Contact Information



Assistant Professor of Chemistry.  ( Chemistry, Max Planck Institute for Chemistry, 2011).
Prof. Shiraiwa brings expertise in kinetic flux models for gas-particle interactions in aerosols and clouds and combines numerical modeling, laboratory experiments, and field measurements on organic aerosol and oxidant chemistry
His research focuses on the properties and multiphase processes of aerosol particles and their effects on atmospheric chemistry, air quality, and human health.  Multiphase chemistry of aerosols are efficient pathways for the formation of secondary organic aerosols (SOA) and aging.  Multiphase chemistry also deals with chemical reactions, transport processes, and transformations between gaseous, liquid, and solid matter.  These processes are essential for Earth system science and climate research as well as for life and health sciences on molecular and global levels, bridging a wide range of spatial and temporal scales from below nanometers to thousands of kilometers and from less than nanoseconds to years.  Understanding the mechanisms and kinetics of these processes is also required to address societally relevant questions of global environmental change and public health.
Key Topics:

  • Gas uptake, formation, evolution and partitioning of organic aerosols
  • Multiphase chemical processes at the atmosphere-biosphere interface including lung lining fluid and human skin
  • Reactive Oxygen Species/Intermediates (ROS/ROI), allergenic proteins and their health effects

Synergistic Activities

  • Co-editor of the journal Atmospheric Chemistry and Physics (since 2015)
  • Chair of the Aerosol Chemistry Working Group, European Aerosol Assembly (EAA) (2011 - 2016)
Research Interests: 

Atmospheric Chemistry, Heterogeneous and Multiphase Chemistry, Aerosol Particles, Reactive Oxygen Species, Kinetic Modeling

Selected Honors and Awards: 
Otto-Hahn Medal, Max Planck Society 2011
Paul-Crutzen Prize, German Chemical Society 2012
Sheldon K. Friedlander Award, American Association for Aerosol Research (AAAR) 2014
Young Scientist Award, Japan Society of Atmospheric Chemistry 2015

Dr. Alex Guenther

Contact Information

Office Location: 3215 Croul Hall




Dr. Guenther is an international leader in atmospheric and terrestrial ecosystem research who has published more than 280 peer-reviewed journal articles.  He has developed numerical models that are widely used by the scientific and regulatory communities to simulate biogenic reactive gas and aerosol emissions for air quality and climate modeling.  He has led more than 40 integrative field studies on six continents in tropical, temperate, and boreal ecosystems to provide observations to advance understanding of biogenic emissions and their role in air quality and climate.  He served as chair of the Global Emissions Inventory Activity (GEIA) and Integrated Land-Ecosystem Process Study (iLEAPS) core activities of the International Geosphere Biosphere Program (IGBP) and was a contributing author for the Third and Fourth Assessment reports of the Intergovernmental Panel on Climate Change.
He comes to us from the Pacific Northwest National Laboratory (2013-2015) where he promoted advancements in understanding the role of ecosystem-atmosphere interactions in climate change.  He also led PNNL’s Environmental Molecular Science Laboratory (EMSL) atmospheric aerosol science theme focus where his work spanned and further integrated PNNL’s extensive measurement capabilities, including the Atmospheric Measurements Laboratory and the laboratory’s diverse programs in atmospheric, ecosystem, and climate modeling.
Prior to PNNL he was Senior Scientist and Section Head, National Center for Atmospheric Research (NCAR), from 1991-2013 where he was responsible for systematic advancement of groundbreaking measurements and modeling of biogenic emissions and their impact on the earth system.  This led to his development of the Model of Emissions of Gases and Aerosols from Nature, or MEGAN, a model that is a critical component of many of the climate and air quality models used by researchers today.  In addition to its wide use in research, MEGAN is also an essential tool used by regulatory agencies including the Environmental Protection Agency.
Research areas: Simulations of Air / Water Pollution and Climate; Chemistry, Processes, and Measurements

  • Ph.D. in Civil and Environmental Engineering, Washington State University (1989)
  • M.S. in Environmental Engineering, Washington State University (1986)
  • B.S. in Biology, University of Puget Sound (1984)

Awards & Honors: 

  • 2015: Fellow of the American Geophysical Union
  • 2012:  University Corporation for Atmospheric Research Outstanding Publication Award
  • 2011:  Yoram J. Kaufman Award for Unselfish Cooperation in Research, American Geophysical Union
  • 2008:  Haagen-Smit Outstanding Publication Prize
  • 2007:  U.S. Environmental Protection Agency Science and Technological Achievement Award
  • 2004:  Elected Chair of the Gordon Conference on Biogenic Volatile Organic Compounds in the Atmosphere
Selected Honors and Awards: 
2004: Elected Chair of the Gordon Conference on Biogenic Volatile Organic Compounds in the Atmosphere
2007: U.S. Environmental Protection Agency Science and Technological Achievement Award
2008: Haagen-Smit Outstanding Publication Prize
2011: Yoram J. Kaufman Award for Unselfish Cooperation in Research, American Geophysical Union
2012: University Corporation for Atmospheric Research Outstanding Publication Award
2015: Fellow of the American Geophysical Union

Dr. James N. Smith

Contact Information

Dr. Smith has most recently served as a Scientist in the Atmospheric Chemistry Observations and Modeling Laboratory at the National Center for Atmospheric Research (NCAR) in Boulder, Colorado as well as Research Director in the Department of Applied Physics at the University of Eastern Finland in Kuopio, Finland.  He brings to the ORU expertise in measurements of atmospheric chemical composition as well as design and development of unique laboratory apparati and field instruments.
At NCAR from 2000–2015, he led the development of the Thermal Desorption Chemical Ionization Mass Spectrometer (TDCIMS), an instrument that can measure the molecular composition of atmospheric nanometer-sized particles. He also developed the Biogenic Aerosol Chamber for studying the formation of secondary organic aerosol from the photo-oxidation of real plant emissions.  Dr. Smith designed and coordinated the development of the Manitou Experimental Forest Observatory—a ground-based research site in Colorado studying the fundamental biogeochemical processes that link and regulate the carbon and water cycles.  Dr. Smith has published more than 60 peer-reviewed journal articles and written or contributed to a number of books.
Research areas Simulations of Air / Water Pollution and Climate; Chemistry, Processes, and Measurements

  • 2000:  Ph.D. Environmental Science and Engineering, Chemistry Minor, California Institute of Technology, Pasadena, California
  • 1984:  B.S. Physics, Philosophy Minor, Harvey Mudd College, Claremont, California
Selected Honors and Awards: 
1999: Lund University Research Fellow, Lund University, Sweden
2000: Herbert Newby McCoy Award for Outstanding Research in Chemistry, Chemistry Department, California Institute of Technology
2003: Nominee for NCAR Scientific Technical Advancement Award
2009: Kenneth T. Whitby Award, in recognition of outstanding contributions to aerosol science and technology by a beginning scientist; American Association for Aerosol Research
2014-2017: Brazilian Science Mobility Program (Programa Ciência sem Fronteiras) Special Visiting Researcher Scholarship

Saewung Kim

Contact Information

Department of Earth System Science

University of California, Irvine

3216 Croul Hall

Irvine, CA 92697




Assistant Professor of Earth System Science[Ph.D., Georgia Institute of Technology].  Professor Kim’s Biosphere-Atmosphere-Human Interaction Research Group conducts studies into the ways that biosphere-atmosphere-human interactions affect tropospheric oxidation capacity, which in turn affects secondary photochemical products such as ozone and aerosols.  His laboratory deploys gas phase atmospheric constituents monitoring instrumentation in the field to constrain tropospheric oxidation capacity, providing precise information to diagnose regional and global air quality—critical for public health and climate change policies.  Selected Honors/Activities include: Antarctica Service Medal of the United States of America, National Science Foundation, (2011); ACCESS X (Atmospheric Chemistry Colloquium for Emerging Senior Scientists) Travel Award, (2009); Postdoctoral Fellow, Advanced Study Program, National Center for Atmospheric Research (NCAR), (2008-2009); John Bradshaw Award, The School of Earth and Atmospheric Sciences, Georgia Institute of Technology, (2007).

Research Interests: 

Saewung Kim's Biosphere-Atmosphere-Human Interaction Research Group conducts research on how biosphere-atmosphere-human interactions are affecting tropospheric oxidation capacity. The lab’s main research activities are deploying gas phase atmospheric constituents monitoring instrumentation to the field to constrain tropospheric oxidation capacity.

Professor Craig Murray

Contact Information

University of California, Irvine
Department of Chemistry
1102 Natural Sciences 2
Irvine, CA 92697-2025
Office: Rowland Hall 317B


Professor Murray graduated from the University of Edinburgh with a B.S. degree in Chemistry in 1997 and remained there for his Ph.D research, supervised by Ken McKendrick.  He held postdoctoral appointments at the University of Bristol (U.K.) and then the University of Pennsylvania, working with Professor Andrew Orr-Ewing and Professor Marsha Lester.  Following the award of a Royal Society University Research Fellowship in 2008, he returned to the University of Bristol before taking up a lectureship at the University of Glasgow in 2011.  He joined the faculty at UC Irvine in 2013.
Professor Murray's group uses a variety of laser-based spectroscopic techniques to explore fundamental gas-phase chemical processes, with a particular interest in atmospheric chemistry.  His current research includes:

  • Velocity-map ion imaging studies of non-conventional photochemistry
  • Spectroscopy and kinetics of reactive intermediates
  • Weakly-bound complexes
Research Interests: 

Atmospheric photochemistry

Selected Publications: 

The following is a list of selected publications.  A full list is available at
Observation of triplet imidogen as a primary product of methylamine photodissociation: Evidence of roaming-mediated intersystem crossing?
James O. Thomas, Katherine E. Lower and Craig Murray
Journal of Physical Chemistry Letters 3 1341-1345 (2012) [10.1021/jz300408z]
Temperature dependent structured absorption spectrum of molecular chlorine
Isla A. K. Young, Craig Murray, Chris M. Blaum, R. A. (Tony) Cox, Roderic L. Jones and Francis D. Pope
Physical Chemistry Chemical Physics 13 15318-15325 (2011) [10.1039/c1cp21337g]
A new spectroscopic window on hydroxyl radicals using UV+VUV resonant ionization
Joseph M. Beames, Fang Liu, Marsha I. Lester and Craig Murray
Journal of Chemical Physics 134 241102-4 (2011) [10.1063/1.3608061]
Analysis of the HOOO torsional potential
Joseph M. Beames, Marsha I. Lester, Craig Murray, Mychel E. Varner and John F. Stanton
Journal of Chemical Physics 134 044304-9 (2011) [10.1063/1.3518415]
Quantum state distributions of the OH X2Π products from collisional quenching of OH A2Σ+ by O2 and CO2
Logan P. Dempsey, Timothy D. Sechler, Craig Murray and Marsha I. Lester
Journal of Physical Chemistry A 113 6851-6858 (2009) [10.1021/jp902935c]

Selected Honors and Awards: 
Royal Society University Research Fellow, 2008-2012
Camille and Henry Dreyfus Environmental Chemistry Fellow, University of Pennsylvania, 2005-2008

Prof. William J. Cooper

Contact Information

University of California, Irvine
ET 305
Irvine, CA 92697-2175
zotcode: 2175

(949) 824-5620

Beginning in September 2013, will serve two years as Program Director for Environmental Engineering at the National Science Foundation in Washington D.C. before returning full time to UCI.

Professor of Civil and Environmental Engineeringat UC Irvine and Director of the Urban Water Research Center.

Ph. D. in Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric Sciences, Univeristy of Miami, Florida. 

Professor Cooper uses techniques of radiation chemistry and environmental analytical chemistry to study the free radical chemistry of pollutants in the aqueous phase.  His two major areas of research interest are sunlight mediated photochemical reactions in natural waters and free radical chemistry of aqueous solutions. One area where these two areas intersect is in the study of the fate and transport of natural dissolved organic matter in surface waters and atmospheric waters (rain and gas phase). He has a number of collaborators here at UCI and throughout the world examining different aspects of this chemistry as it applies to environmental chemistry.

One of the physical chemical tools not available at UCI which his group uses is pulsed radiolysis with transient absorption spectroscopy. For those studies he goes to the US DOE Notre Dame Radiation Laboratory. He (and his collaborator, Weihua Song) is a certified operator of the pulsed linac (linear accelerator) and the 60Co gamma-source. The pulsed linac is used to evaluate the absolute bimolecular reaction rate constants of organic compounds with the hydroxyl radical, the solvated electron and hydrogen atom. The gamma-source is used to elucidate destruction mechanisms of the various compounds of interest. The School of Physical Sciences Mass Spec lab is used extensively in by-product identification for these mechanistic studies.

In studies regarding dissolved organic matter in natural waters, he has recently initiated studies comparing photochemically mediated reactions to those resulting from the ‘in situ’ generated free radicals and reactive oxygen species. For studies in the molecular characterization of dissolved organic matter, he and Michael Gonsior are collaborating with the Florida State University National High Magnetic Field Center, (William T. Cooper) using the 9.4 Tesla, ultra high resolution, FT- ion cyclotron resonance mass spectrometer.  They are also collaborating with Philippe Schmitt-Kopplin and Norbert Hertkorn characterizing dissolved organic matter in natural waters.

Research Interests: 
  • Analytical chemistry of chlorine residuals
  • Disinfection byproducts
  • Trace organics analysis
  • Carbon cycling in coastal oceans
  • Application of free radical chemistry in advanced oxidation processes (AOPs)
  • Application of ozonation for ballast water treatment at full-scale on oil tankers
  • Reaction rates and destruction mechanisms
  • Kinetic models for optimizing AOPs

Prof. Douglas J. Tobias

Contact Information

University of California, Irvine
4118 Natural Sciences 1
Mail Code: 2025
Irvine, CA 92697

(949) 824-4295

Professor of Chemistry [Ph. D., Chemistry/Biophysics, Carnegie Mellon University] He brings expertise in molecular dynamics simulations of atmospherically relevant systems as well as biological systems to the ORU.

Dr. Tobias uses atomic-scale computer simulation techniques based on classical and quantum mechanics to study the structure and dynamics of biological molecules and interfaces between aqueous solutions—like sea salt—and water that are important in atmospheric chemical processes. His computer simulations are invaluable in interpreting the chemistry of complex systems in the atmosphere, including how air pollutants interact with biological systems like the human lung. A substantial portion of research in the Tobias group is devoted to the development, implementation, and optimization of novel simulation methodology and analysis tools. Current research in the group may be organized into two broad categories: (1) structure and chemical dynamics at aqueous and organic interfaces relevant to heterogeneous atmospheric chemistry; (2) structure, stability, dynamics, and function of membranes and membrane proteins.

In the first area, he uses molecular dynamics simulations to model the air-solution interfaces of salt solutions, with and without organic coatings. The simulations are used to predict the compositions of the interfaces, which are often different from the bulk solution, and the reactivity of ions toward atmospheric oxidants (trace gases such as ozone and hydroxyl radical). An essential aspect of his simulations of the interfaces of aqueous ionic solutions is the use of empirical force fields that explicitly account for electronic polarization. His group invests considerable effort developing and validating polarizable force fields. With the use of polarizable force fields, they have predicted that certain anions adsorb to the air-water interface. Their predictions are tested in collaborations with experimentalists using surface-sensitive spectroscopic techniques. The presence of ions at the air/solution interface opens the door for potentially novel chemistry. They are exploring the mechanisms of reactions occurring on the surface of aqueous solutions using so-called “ab initio molecular dynamics” simulations, in which the forces are computed from electronic structure, and ground and excited state high- level electronic structure calculations on configurations extracted from their simulations. They are also modeling the effects of organic coatings on the surfaces of aerosol particles, the uptake and transport of atmospheric gases in organic thin films, and the interactions of particulate matter with biological membrane-mimetic systems.

In the second area, the Tobias group is studying lipid monolayers and bilayer membranes, and membrane proteins using large-scale, atomistic molecular dynamics simulations. Current subjects under investigation in this area are: the role of lipid-protein interactions in determining the specificity of the binding of peripheral membrane proteins, including peptide toxins and signaling proteins; the motion of charges through membranes in the context of voltage sensing by voltage gated ion channels; predicting conformational changes that occur in a proton-coupled sugar transporter protein; recognition of peptide sequences by the membrane-bound translocon complex, which either secretes peptides into the lumen of the cell or inserts them into membranes; the role of protein- lipid-water dynamical coupling in the dynamics and function of membrane proteins. In addition, they are using multi-scale quantum mechanical/molecular mechanical (QM/MM) approaches to study proton transport across membrane by proton channel proteins, and they are developing normal mode analyses of elastic network models for the prediction of large-scale conformational cha nges in membrane proteins.

Research Interests: 
  • Theoretical and Computational Chemistry
  • Biophysical Chemistry
  • Atmospheric Chemistry
Selected Honors and Awards: 
National Institutes of Health predoctoral trainee, 1987-1990
National Institutes of Health postdoctoral fellow, 1991-1994
Elected Fellow of the American Association for the Advancement of Science, 2006
Fellow of the American Chemical Society, 2013

Prof. Eric S. Saltzman

Contact Information

University of California, Irvine
3325 Croul Hall
Mail Code: 3100
Irvine, CA 92697

(949) 824-3936

Professor of Earth System Science [Ph.D, in Oceanography from Rosenstiel School of Marine and Atmospheric Science, University of Miami, FL]. Professor Saltzman brings expertise in detection of atmospheric trace gases, and of fluxes and cycling of trace gases through the marine atmosphere.

Dr. Saltzman’s research is focused on understanding the atmospheric cycling of low- level biogenic trace gases which have the potential to strongly impact the climate system. Examples of such gases include dimethylsufide, which influences cloud radiative properties, and the methyl halides, which influence stratospheric ozone.

One current activity is a study of the role of reactive halogens in tropospheric photochemistry. This effort involves the development of atmospheric pressure, chemical ionization mass spectrometric (APCI-MS) methods for low level detection of reactive halogenated gases, such as Br2, Cl2, HOBr, HOCl, Field studies involve measurements both at remote marine sites and in coastal polluted air. The goal of this research is to understand the how reactive halogens cycle between gas and aerosol phases and to assess the impact of halogen chemistry on tropospheric reactivity and air quality.

Another research activity involves the direct measurement of air/sea fluxes using micro-meteorological techniques. This involves seagoing deployment of APCI-MS instrumentation and real-time, fast response measurements of dimethylsulfide in air and seawater. The goal of this work is to quantify the air/sea transfer of dimethylsulfide and to develop physically-based models of gas transport across the air/sea interface.

The Saltzman laboratory is also engaged in the extraction and analysis of trace gases from polar ice cores. This work is focused on trace halocarbon, hydrocarbon, and sulfur-containing gases and it involves the use of high resolution mass spectrometry with isotope dilution. The goals of this work are to explore the range of natural variability of the trace gas composition of the atmosphere, to understand the role of climate in atmospheric variability, and to assess the impact of industrialization on atmospheric chemistry. This work involves the collection and analysis of firn air and ice cores from Greenland and Antarctica.

Prior to joining UCI in 2000, Dr. Saltzman was Professor of Marine and Atmospheric Chemistry at the University of Miami and Program Manager for Atmospheric Chemistry at NSF. 

Research Interests: 
  • Atmospheric Chemistry
  • Biogeochemistry
  • Air/Sea Exchange
Selected Honors and Awards: 
Elected Fellow, American Geophysical Union 2011

Prof. Sergey Nizkorodov

Contact Information

University of California, Irvine
377 Rowland Hall
Mail Code: 2025
Irvine, CA 92697

(949) 824-1262

Co-Director, AirUCI Institute.  Assistant Professor of Chemistry [Ph.D. in Chemistry from University of Basel, Switzerland]. Prof. Nizkorodov brings expertise in fundamental photochemistry of atmospherically relevant systems to the ORU, including that of secondary organic aerosols.
Dr. Nizkorodov’s research focuses on chemical processes taking place in atmospheric particulate matter. The majority of his group members work on photochemical aging of secondary organic aerosol. The goal of this project is to understand how solar radiation affects physical, chemical, and toxicological properties of organic particles. Another area of interest is chemistry of ozone and particulate matter in indoor environments. The current project focuses on indoor ozone and particle generation by ionization and ozonation air purifiers. This project is of great practical importance for developing legislative regulation for ozone-emitting appliances sold to the general public. Due to the large public interest in this topic, Prof. Nizkorodov has been the subject of several articles and TV interviews.
The third area of interest is in hygroscopic properties of aerosolized nanoparticles. The goal of this project is to develop fundamental understanding of phase transitions in nanoparticles containing variable amounts (0-100%) of sur face active organic molecules.

Research Interests: 
  • Atmospheric Chemistry of Organic Aerosols
Selected Honors and Awards: 
Camille Dreyfus Teacher-Scholar Award (2007)
UCI School of Physical Sciences Award for Outstanding Contributions to Undergraduate Education (2006)
Coblentz Award (2005) for research achievements in vibrational spectroscopy
Research Corporation Research Innovation Award (2003)
Camille and Henry Dreyfus Postdoctoral Scholarship (2000)
International Journal Student Paper Award from Elsevier Science and Finnigan MAT (1996)