World's Best Scientists 2026 revealed!

D-Index & Metrics

Environmental Sciences

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

John T. Walker publication distribution in Environmental Sciences in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Environmental Sciences in 2026. The highlighted bar marks where John T. Walker sits on this spectrum.

41–50 publications: 21 scientists 51–60 publications: 62 scientists 61–70 publications: 133 scientists 71–80 publications: 257 scientists 81–90 publications: 361 scientists 91–100 publications: 440 scientists 101–110 publications: 492 scientists 111–120 publications: 541 scientists 121–130 publications: 617 scientists 131–140 publications: 544 scientists 141–150 publications: 541 scientists 151–160 publications: 539 scientists 161–170 publications: 444 scientists 171–180 publications: 444 scientists 181–190 publications: 400 scientists 191–200 publications: 377 scientists 201–210 publications: 318 scientists 211–220 publications: 283 scientists 221–230 publications: 263 scientists 231–240 publications: 220 scientists 241–250 publications: 217 scientists 251–260 publications: 180 scientists 261–270 publications: 181 scientists 271–280 publications: 155 scientists 281–290 publications: 130 scientists 291–300 publications: 127 scientists 301–310 publications: 130 scientists 311–320 publications: 85 scientists 321–330 publications: 106 scientists 331–340 publications: 80 scientists 341–350 publications: 83 scientists 351–360 publications: 75 scientists 361–370 publications: 69 scientists 371–380 publications: 52 scientists 381–390 publications: 54 scientists 391–400 publications: 56 scientists 401–410 publications: 44 scientists 411–420 publications: 40 scientists 421–430 publications: 36 scientists 431–440 publications: 25 scientists 441–450 publications: 25 scientists 451–460 publications: 32 scientists 461–470 publications: 29 scientists 471–480 publications: 21 scientists 481–490 publications: 26 scientists 491–500 publications: 25 scientists 501–510 publications: 17 scientists 511–520 publications: 18 scientists 521–530 publications: 15 scientists 531–540 publications: 22 scientists 541–550 publications: 12 scientists 551–560 publications: 15 scientists 561–570 publications: 11 scientists 571–580 publications: 19 scientists 581–590 publications: 9 scientists 591–600 publications: 9 scientists 601–610 publications: 7 scientists 611–620 publications: 11 scientists 621–630 publications: 5 scientists 631–640 publications: 5 scientists 641–650 publications: 6 scientists 651–660 publications: 3 scientists 661–670 publications: 3 scientists 671–680 publications: 4 scientists 681–686 publications: 3 scientists 687+ publications: 100 scientists
41 publications 687+

This scientist: 116 publications — 22nd percentile

22% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 687 publications or more.

John T. Walker D-index placement in Environmental Sciences in 2026

The chart shows the D-index (discipline H-index) distribution of Environmental Sciences scientists ranked by Research.com in 2026. The highlighted bar marks where John T. Walker sits on this spectrum.

30 D-Index: 12 scientists 31 D-Index: 26 scientists 32 D-Index: 51 scientists 33 D-Index: 88 scientists 34 D-Index: 123 scientists 35 D-Index: 163 scientists 36 D-Index: 206 scientists 37 D-Index: 267 scientists 38 D-Index: 265 scientists 39 D-Index: 275 scientists 40 D-Index: 321 scientists 41 D-Index: 343 scientists 42 D-Index: 305 scientists 43 D-Index: 336 scientists 44 D-Index: 330 scientists 45 D-Index: 348 scientists 46 D-Index: 291 scientists 47 D-Index: 275 scientists 48 D-Index: 272 scientists 49 D-Index: 273 scientists 50 D-Index: 263 scientists 51 D-Index: 232 scientists 52 D-Index: 266 scientists 53 D-Index: 217 scientists 54 D-Index: 199 scientists 55 D-Index: 177 scientists 56 D-Index: 202 scientists 57 D-Index: 204 scientists 58 D-Index: 166 scientists 59 D-Index: 177 scientists 60 D-Index: 166 scientists 61 D-Index: 152 scientists 62 D-Index: 143 scientists 63 D-Index: 150 scientists 64 D-Index: 124 scientists 65 D-Index: 119 scientists 66 D-Index: 120 scientists 67 D-Index: 118 scientists 68 D-Index: 82 scientists 69 D-Index: 98 scientists 70 D-Index: 94 scientists 71 D-Index: 105 scientists 72 D-Index: 74 scientists 73 D-Index: 84 scientists 74 D-Index: 70 scientists 75 D-Index: 67 scientists 76 D-Index: 78 scientists 77 D-Index: 60 scientists 78 D-Index: 59 scientists 79 D-Index: 52 scientists 80 D-Index: 47 scientists 81 D-Index: 38 scientists 82 D-Index: 48 scientists 83 D-Index: 42 scientists 84 D-Index: 42 scientists 85 D-Index: 43 scientists 86 D-Index: 29 scientists 87 D-Index: 37 scientists 88 D-Index: 29 scientists 89 D-Index: 30 scientists 90 D-Index: 34 scientists 91 D-Index: 20 scientists 92 D-Index: 22 scientists 93 D-Index: 17 scientists 94 D-Index: 19 scientists 95 D-Index: 24 scientists 96 D-Index: 21 scientists 97 D-Index: 20 scientists 98 D-Index: 24 scientists 99 D-Index: 17 scientists 100 D-Index: 17 scientists 101 D-Index: 21 scientists 102 D-Index: 25 scientists 103 D-Index: 18 scientists 104 D-Index: 26 scientists 105 D-Index: 19 scientists 106 D-Index: 15 scientists 107 D-Index: 10 scientists 108 D-Index: 13 scientists 109 D-Index: 15 scientists 110 D-Index: 12 scientists 111 D-Index: 8 scientists 112 D-Index: 7 scientists 113 D-Index: 9 scientists 114 D-Index: 6 scientists 115 D-Index: 12 scientists 116 D-Index: 7 scientists 117 D-Index: 8 scientists 118 D-Index: 3 scientists 119 D-Index: 5 scientists 120 D-Index: 7 scientists 121 D-Index: 2 scientists 122 D-Index: 4 scientists 123 D-Index: 8 scientists 124 D-Index: 7 scientists 125+ D-Index: 99 scientists
30 D-Index 125+

This scientist: 44 D-Index — 32nd percentile

32% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 125 D-Index or more.

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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