Photo of  Steven R.H. Barret
Steven R.H. Barret (Assistant Professor), Aero-Astro

Steven’s principal research objective is to advance understanding of how aviation impacts the environment and to develop strategies to mitigate those impacts. His work related to atmospheric chemistry is mainly in modeling aviation emissions and associated impacts on atmospheric composition, climate, and air quality (including public health), and in modeling the effect of mitigation strategies including improving aircraft operations or design and use of alternative fuels. He also works on quantifying the environmental impacts of other emissions sources such as road transportation and power generation.

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Daniel J. Cziczo (Associate Professor), Earth, Atmospheric and Planetary Sciences

Dan Cziczo is an atmospheric scientist interested in the interrelationship of particulate matter and cloud formation. His research utilizes laboratory and field studies to elucidate how small particles interact with water vapor to form droplets and ice crystals which are important players in the Earth’s climate system. Experiments include using small cloud chambers in the laboratory to mimic atmospheric conditions that lead to cloud formation and observing clouds in situ from remote mountaintop sites or through the use of research aircraft. Dan’s current research interests include: Chemical composition of atmospheric aerosols with an emphasis on their effect on cloud formation mechanisms, Earth’s radiative budget, and meteoritic debris and launch vehicle emissions in the atmosphere.

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Robert W. Field (Professor), Chemistry

Robert Field’s research centers on the experimental methods and theory of the spectra and unimolecular dynamics of small molecules in the gas phase.  His research group uses the techniques of frequency-domain laser and Chirped Pulse millimeter Wave spectroscopies, in combination with versatile sources of translationally and internally cold molecules, to answer fundamental questions of molecular structure and dynamics.  These spectroscopic techniques and molecular sources are well suited for monitoring species and processes relevant to Atmospheric Chemistry.

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Photo of  Colette L. Heald
Colette L. Heald (Associate Professor), Civil and Environmental Engineering and Earth, Atmospheric and Planetary Sciences

Colette Heald’s research focuses on understanding global atmospheric composition and chemistry, and interactions of these with the biosphere and climate system. This includes the study of both particles and gases in the troposphere: their sources, sinks, transformations, long range transport and environmental impacts. She works at the intersection of modeling and observational analysis, with a strong emphasis on the integration of the two. This involves using observations of the atmosphere from all scales: from ground stations, aircraft campaigns and satellite sensors with global models of chemistry and climate.

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Photo of  Jesse H. Kroll
Jesse H. Kroll (Associate Professor), Civil and Environmental Engineering

Our research involves understanding the chemical transformations of organic species in the Earth’s atmosphere. Atmospheric organics play several roles of central importance to environmental science: they affect air quality by forming secondary pollutants such as ozone; they make up a large fraction of particulate matter, with serious implications for human health and climate; and they exchange with other domains in the environment (oceans, soils, etc.), influencing biogeochemical cycles and the distribution of pollutants. The aim of our research is to gain a detailed understanding of these effects via the improved characterization of the sources and evolution of atmospheric organics.  Our primary focus is on laboratory studies, in which the atmospheric transformations of organics are carried out under carefully controlled reaction conditions. We are also involved in the development of new analytical tools for the measurement and characterization of atmospheric organics, and use of these tools in both the laboratory and the field.

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Photo of  Shuhei  Ono
Shuhei Ono (Assistant Professor), Earth, Atmospheric and Planetary Sciences

We apply stable isotope systems to trace biogeochemical cycles in the past and present.  In particular, we work on sulfur mass-independent isotope effect as a unique signature of atmospheric sulfur chemistry preserved in geologic records.  In addition, we are developing a state-of-the-art instrument for isotopomer monitoring of atmospheric nitrous oxide.  The instrument will be used autonomous on-site monitoring at AGAGE stations to better constrain its sources and sinks.

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Photo of  Ron G. Prinn
Ron G. Prinn (Professor), Earth, Atmospheric and Planetary Sciences

Professor Prinn’s research interests incorporate the chemistry, dynamics, and physics of the atmospheres of the Earth and other planets, and the chemical evolution of atmospheres. He is currently involved in a wide range of projects in atmospheric chemistry and biogeochemistry, climate science, and integrated assessment of science and policy regarding climate change. He leads the Advanced Global Atmospheric Gases Experiment (AGAGE), in which the rates of change of the concentrations of the trace gases involved in the greenhouse effect and ozone depletion have been measured continuously over the globe for the past three decades. He is pioneering the use of inverse methods, which use such measurements and three-dimensional models to determine trace gas emissions and understand atmospheric chemical processes, especially those processes involving the oxidation capacity of the atmosphere. He is also working extensively with social scientists to link the science, economics and policy aspects of global change.

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Photo of  Noelle E. Selin
Noelle E. Selin (Assistant Professor), Engineering Systems Division and Earth, Atmospheric and Planetary Sciences

Research in the Selin group integrates atmospheric chemistry modeling with analysis of impacts and policy. Our goal is to better understand the processes and interactions of air pollution and global environmental contamination, with the aim of designing and informing sustainable management approaches. Specifically, we focus on two areas: (1) advancing fundamental understanding of the transport and fate of toxic atmospheric constituents such as mercury (Hg), persistent organic pollutants (POPs), and selected other pollutants influencing human well-being, and (2) developing new modeling approaches and theories to improve understanding of interactions among human, natural and technological systems.

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Photo of  Susan  Solomon
Susan Solomon (Professor), Earth, Atmospheric and Planetary Sciences

Research in the Solomon group includes three primary components, two of which are disciplinary, and a third that extends into new interdisciplinary directions:  (i) advancing the understanding of chemistry-climate coupling and climate predictability on time scales ranging from decades to millennia, (ii) better quantifying ozone depletion chemistry and its linkages to climate change, and (iii) identifying climate change impacts on human society and nature, particularly the signals of anthropogenic changes that are emerging or will soon emerge from the noise of internal variability.

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Chien Wang (Senior Research Scientist), Earth, Atmospheric and Planetary Sciences

Chien Wang’s research interests include atmospheric aerosols and clouds, tropospheric chemical processes, and the roles of aerosol-cloud interaction in atmospheric chemistry, precipitation, and climate dynamics. He also study climate impacts of anthropogenic activities that alter atmospheric compositions or change the Earth’s surface properties or energy budget. His research involves the development and use of cloud-resolving model and global climate model, both including interactive aerosol and atmospheric chemical processes. He and his group also use surface network data, aircraft measurement, and satellite retrievals to constrain and optimize the models.

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