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Department of Chemistry and Biochemistry

Faculty and Staff Directory

Wendell Walters

Title: Assistant Professor/ Analytical/ Environmental
Department of Chemistry and Biochemistry
Office: GSRC 205
Resources: CV [pdf]
The Walters Research Group
Wendell Walter 2023 Headshot


B.S. Chemistry, 2012, University of Maryland College Park

Ph.D. Earth Atmospheric and Planetary Sciences, 2016, Purdue University

Honors and Awards

Atmospheric Chemistry Colloquium for Emerging Senior Scientists (ACCESS XIV), Selected Participant, Brookhaven National Lab, 2017; NSF Atmospheric and Geospace Sciences (AGS) Postdoctoral Fellowship, 2016; Bisland Dissertation Fellowship, 2016; NSF Graduate Research Fellowship, 2013.

Research Interests

Our research focuses on the connections between atmospheric chemistry with the environment and climate.  Natural and anthropogenic activities, including volcano eruptions, fossil fuel combustion, and agriculture, have significantly altered the environment and climate due to the emissions and chemistry involving trace gases and aerosols.  Our research aims to quantify the impacts of natural and anthropogenic perturbations on the chemistry and composition of the atmosphere and its ramifications for the environment, human health, and climate.  We study a range of environments, from urban areas to polar regions, that have important ramifications for improving air quality to understand the connection between the atmosphere/biosphere system and long-term atmospheric chemistry/climate connections.   Our research themes include: (1) reactive nitrogen and sulfur in a changing world, (2) atmospheric chemistry in remote environments, and (3) urban air quality and greenhouse gas emissions.  This research often involves using novel stable isotope measurements and advanced instrumentation for high-resolution and/or high-density concentration measurements.

Selected Publications

Kim, H.; Walters, W.W.; Bekker, C.; Murray, L.T.; Hastings, M.G. Nitrate chemistry in the Northeast US Part II:  Oxygen Isotopes Reveal Differences in Particulate and Gas Phase Formation. Chem. Phys., 23(7), 4203-4219, 2023.

Walters, W.W., Wilcock, E.; Baek, B.H.; Karod, M.; Blum, D.E.; Hastings, M.G. Quantifying the importance of vehicle ammonia emissions in an urban area of the northeastern US utilizing nitrogen isotopes. Chem. Phys., 22(20), 13431-13448, 2022.

Blum, D. E.; Walters, W.W.; Hastings, M.G. Collection Methods of Simultaneously Speciated Nitric Acid and Fine Particulate Matter for Determination of Nitrogen and Oxygen Stable Isotopic Composition, Anal Chem, 92, 16079-16088, 2020.

Walters, W.W.; Song, L.; Fang, Y.; Colombi, N.; Chai, J.; Hastings, M.G. Characterizing the spatiotemporal nitrogen stable isotopic composition of ammonia in vehicle plumes Chem. Phys., 20, 11551-11567, 2020.

Walters, W.W.; Michalski, G.; Böhlke, J. K.; Alexander, B.; Savarino, J.; Thiemens, M. H. Assessing the seasonal dynamics of nitrate and sulfate aerosols at the South Pole utilizing stable isotopes. J Geophys Res-Atmos. 124(14), 8161-8177, 2019.

Walters, W.W.; Chai, J.; Hastings, M.G. Theoretical phase resolved ammonia- ammonium nitrogen equilibrium isotope exchange fractionations: Applications for tracking atmospheric ammonia gas-to-particle conversion. ACS Earth Space Chem., 3(1), 79-89, 2018.

Walters, W.W.; Fang, H.; Michalski, G. Summertime diurnal variations in the isotopic composition of atmospheric nitrogen dioxide at a small midwestern United States city. Atmospheric Environ. 179, 1-11, 2016.

Walters, W. W.; Michalski, G. Ab initio study of nitrogen and position-specific oxygen kinetic isotope effects in the NO + O3 J. Chem. Phys. 145(22), 224311, 2016.

Walters, W.W.; Tharp, B. D.‡; Fang, H.; Kozak, B. J.; Michalski, G. Nitrogen isotope composition of thermally produced NOx from various fossil-fuel combustion sources. Sci. Techn., 49(19), 11363-11371, 2015.


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