World's Best Scientists 2026 revealed!

D-Index & Metrics

Environmental Sciences

D-Index
44
Citations
6648
World Ranking
6829
National Ranking
2433

Overview

John T. Walker is affiliated with the Environmental Protection Agency in the United States, focusing their research on environmental science and earth and planetary sciences. Their work spans multiple subfields including atmospheric science, global and planetary change, plant science, health, toxicology and mutagenesis, as well as oceanography.

The scientist's research concentrates on topics such as atmospheric chemistry and aerosols, atmospheric and environmental gas dynamics, plant responses to elevated CO2, air quality and health impacts, atmospheric ozone and climate, atmospheric aerosols and clouds, and marine and coastal ecosystems.

Recent publications by John T. Walker cover a range of topics related to atmospheric and environmental sciences. Notable papers include:

  • The acidity of atmospheric particles and clouds, 2020, Atmospheric chemistry and physics
  • Temporal trends in methane emissions from a small eutrophic reservoir: the key role of a spring burst, 2021, Biogeosciences
  • Atmospheric deposition of reactive nitrogen to a deciduous forest in the southern Appalachian Mountains, 2023, Biogeosciences
  • Estimating source-sink distributions and fluxes of reactive nitrogen and sulfur within a mixed forest canopy, 2023, Agricultural and Forest Meteorology
  • Spatial heterogeneity of ammonia fluxes in a deciduous forest and adjacent grassland, 2022, Agricultural and Forest Meteorology

Frequently publishing in the journals Atmospheric chemistry and physics, Biogeosciences, Agricultural and Forest Meteorology, Atmospheric Environment, and Atmosphere, Walker contributes regularly to leading environmental science venues.

The scientist collaborates often with several coauthors who have contributed multiple times to their research projects. These frequent collaborators include Zhiyong Wu, Donna Schwede, Jesse O. Bash, Gregory Beachley, and Ryan Daly.

Best Publications

  • The acidity of atmospheric particles and clouds

    Havala O. T. Pye;Athanasios Nenes;Becky Alexander;Andrew P. Ault

  • Increasing importance of deposition of reduced nitrogen in the United States

    Yi Li;Bret A. Schichtel;John T. Walker;Donna B. Schwede

  • Towards a climate-dependent paradigm of ammonia emission and deposition

    Mark A. Sutton;Stefan Reis;Stuart N. Riddick;Ulrike Dragosits

  • Characterization of atmospheric ammonia emissions from swine waste storage and treatment lagoons

    Viney P. Aneja;J. P. Chauhan;John Walker

  • Exchange processes of volatile organic compounds above a tropical rain forest: Implications for modeling tropospheric chemistry above dense vegetation

    Thomas Karl;Mark Potosnak;Mark Potosnak;Alex Guenther;Deborah Clark

  • Ambient ammonia and ammonium aerosol across a region of variable ammonia emission density

    J.T. Walker;Dave R Whitall;Wayne Robarge;Hans W. Paerl

  • Evaluation of a regional air-quality model with bidirectional NH 3 exchange coupled to an agroecosystem model

    J. O. Bash;E. J. Cooter;R. L. Dennis;J. T. Walker

  • Atmospheric transport and wet deposition of ammonium in North Carolina

    John T. Walker;Viney P. Aneja;David A. Dickey

  • Atmospheric concentrations of ammonia and ammonium at an agricultural site in the southeast United States

    Wayne P. Robarge;John T. Walker;Ronald B. McCulloch;George Murray

  • Measurement and analysis of atmospheric ammonia emissions from anaerobic lagoons

    V.P. Aneja;B. Bunton;J.T. Walker;B.P Malik

  • TES ammonia retrieval strategy and global observations of the spatial and seasonal variability of ammonia

    M.W Shephard;K.E Cady-Pereira;M. Luo;D.K Henze

  • An assessment of the performance of the Monitor for AeRosols and GAses in ambient air (MARGA): a semi-continuous method for soluble compounds

    I. C. Rumsey;K. A. Cowen;J. T. Walker;T. J. Kelly

  • Passive ammonia monitoring in the United States: Comparing three different sampling devices

    Melissa A. Puchalski;Mark E. Sather;John T. Walker;Christopher M. B. Lehmann

  • Agricultural ammonia emissions and ammonium concentrations associated with aerosols and precipitation in the southeast United States

    Viney P. Aneja;Dena R. Nelson;Paul A. Roelle;John T. Walker;John T. Walker

  • An assessment of the ability of three‐dimensional air quality models with current thermodynamic equilibrium models to predict aerosol NO3−

    Shaocai Yu;Shaocai Yu;Robin Dennis;Robin Dennis;Shawn Roselle;Shawn Roselle;Athanasios Nenes

  • Development and evaluation of an ammonia bidirectional flux parameterization for air quality models

    Jonathan E. Pleim;Jesse O. Bash;John T. Walker;Ellen J. Cooter

  • N2O Emissions from Streams in the Neuse River Watershed, North Carolina

    Craig A. Stow;John T. Walker;Lynette Cardoch;Porche Spence

  • Measurement of bi-directional ammonia fluxes over soybean using the modified Bowen-ratio technique

    J.T. Walker;W.P. Robarge;Y. Wu;T.P. Meyers

  • Estimation of NH3 bi-directional flux from managed agricultural soils

    Ellen J. Cooter;Jesse O. Bash;John T. Walker;M.R. Jones

  • Estimation of in-canopy ammonia sources and sinks in a fertilized Zea mays field.

    Jesse O. Bash;John T. Walker;Gabriel G. Katul;Matthew R. Jones

  • An assessment of the performance of the Monitor for AeRosols and GAses in ambient air (MARGA): a semi-continuous method for soluble compounds

    I. C. Rumsey;K. Cowen;T. Kelly;E. Hanft

Frequent Co-Authors

Jesse O. Bash
Jesse O. Bash Environmental Protection Agency
Viney P. Aneja
Viney P. Aneja North Carolina State University
Karen Cady-Pereira
Karen Cady-Pereira Atmospheric and Environmental Research
Daven K. Henze
Daven K. Henze University of Colorado Boulder
Robert W. Pinder
Robert W. Pinder Environmental Protection Agency
Mark W. Shephard
Mark W. Shephard Environment and Climate Change Canada
Robin L. Dennis
Robin L. Dennis Environmental Protection Agency
Andrey Khlystov
Andrey Khlystov Desert Research Institute
Bret A. Schichtel
Bret A. Schichtel National Park Service
Eiko Nemitz
Eiko Nemitz UK Centre for Ecology & Hydrology

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