World's Best Scientists 2026 revealed!

D-Index & Metrics

Environmental Sciences

D-Index
36
Citations
7031
World Ranking
9071
National Ranking
3255

James O. Sickman 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 James O. Sickman 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: 104 publications — 15th percentile

15% of scientists in this discipline score the same or lower.

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

James O. Sickman 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 James O. Sickman 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: 36 D-Index — 7th percentile

7% of scientists in this discipline score the same or lower.

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

Overview

James O. Sickman is affiliated with the University of California, Riverside in the United States. Their work centers on environmental science and earth and planetary sciences, with a particular focus on geochemistry, ecology, soil science, water science, and environmental chemistry.

Their research contributions span multiple key topics, including:

  • Groundwater and Isotope Geochemistry
  • Soil Carbon and Nitrogen Dynamics
  • Peatlands and Wetlands Ecology
  • Groundwater Flow and Contamination Studies
  • Soil and Water Nutrient Dynamics
  • Microbial Community Ecology and Physiology
  • Water Quality and Resources Studies

Sickman has published in several frequent venues, with notable appearances in:

  • Science Advances
  • Ground Water
  • Biogeochemistry
  • Water Resources Research
  • Elementa Science of the Anthropocene

Recent papers authored by or involving Sickman include:

  • "Groundwater Quality in the Yucatan Peninsula: Insights from Stable Isotope and Metals Analysis," 2021, Ground Water
  • "Rapid nitrate reduction produces pulsed NO and N2O emissions following wetting of dryland soils," 2022, Biogeochemistry
  • "Bacterial denitrification drives elevated N 2 O emissions in arid southern California drylands," 2023, Science Advances
  • "Soil NH3 emissions across an aridity, soil pH, and N deposition gradient in southern California," 2023, Elementa Science of the Anthropocene
  • "Isogeochemical Characterization of Mountain System Recharge Processes in the Sierra Nevada, California," 2024, Water Resources Research

The scientist frequently collaborates with several co-authors, including:

  • Alexander H. Krichels
  • G. Darrel Jenerette
  • Hannah Shulman
  • Stephanie Piper
  • Holly Andrews

Best Publications

  • The effect of permafrost thaw on old carbon release and net carbon exchange from tundra

    Edward A. G. Schuur;Jason G. Vogel;Kathryn G. Crummer;Hanna Lee

  • Ecological Effects of Nitrogen Deposition in the Western United States

    Mark E. Fenn;Jill S. Baron;Edith B. Allen;Heather M. Rueth

  • Nitrogen Emissions, Deposition, and Monitoring in the Western United States

    Mark E. Fenn;Richard Haeuber;Gail S. Tonnesen;Jill S. Baron

  • Comparison of multivariate methods for inferential modeling of soil carbon using visible/near-infrared spectra

    G.M. Vasques;S. Grunwald;J.O. Sickman

  • Episodic rewetting enhances carbon and nitrogen release from chaparral soils

    Amy E. Miller;Joshua P. Schimel;Thomas Meixner;James O. Sickman

  • Evidence for nutrient enrichment of high-elevation lakes in the Sierra Nevada, California

    James O. Sickman;John M. Melack;David W. Clow

  • EFFECTS OF URBANIZATION ON ORGANIC CARBON LOADS IN THE SACRAMENTO RIVER, CALIFORNIA

    J. O. Sickman;M. J. Zanoli;H. L. Mann

  • Modeling of Soil Organic Carbon Fractions Using Visible–Near-Infrared Spectroscopy

    Gustavo M. Vasques;Sabine Grunwald;James O. Sickman

  • Mechanisms underlying export of N from high-elevation catchments during seasonal transitions

    James O. Sickman;Al Leydecker;Cecily C.Y. Chang;Carol Kendall

  • Carbon Mineralization and Labile Organic Carbon Pools in the Sandy Soils of a North Florida Watershed

    Mi-Youn Ahn;Andrew R. Zimmerman;Nick B. Comerford;James O. Sickman

  • Aridity and plant uptake interact to make dryland soils hotspots for nitric oxide (NO) emissions.

    Peter M. Homyak;Joseph C. Blankinship;Kenneth Marchus;Delores M. Lucero

  • Regional modelling of soil carbon at multiple depths within a subtropical watershed.

    G.M. Vasques;S. Grunwald;N.B. Comerford;J.O. Sickman

  • Physical pathways of nutrient supply in a small, ultraoligotrophic arctic lake during summer stratification

    Sally MacIntyre;James O. Sickman;James O. Sickman;Sarah A. Goldthwait;George W. Kling

  • Oceanographic anomalies and sea-level rise drive mangroves inland in the Pacific coast of Mexico

    Xavier López-Medellín;Exequiel Ezcurra;Charlotte González-Abraham;Jon Hak

  • Different sensitivities of snowpacks to warming in Mediterranean climate mountain areas

    J.I. López-Moreno;Simon Gascoin;J. Herrero;E.A. Sproles

  • A two-component hydrograph separation for three high-elevation catchments in the Sierra Nevada, California

    A. K. Huth;A. Leydecker;J. O. Sickman;R. C. Bales

  • Nitrogen mass balances and abiotic controls on N retention and yield in high-elevation catchments of the Sierra Nevada, California, United States

    James O. Sickman;Al Leydecker;John M. Melack

  • Regional analysis of inorganic nitrogen yield and retention in high-elevation ecosystems of the Sierra Nevada and Rocky Mountains

    James O. Sickman;John M. Melack;John L. Stoddard

  • Interannual variability of snowmelt in the Sierra Nevada and Rocky Mountains, United States: Examples from two alpine watersheds

    Steven M. Jepsen;Noah P. Molotch;Noah P. Molotch;Mark W. Williams;Karl E. Rittger

  • Identifying sources of dissolved organic carbon in agriculturally dominated rivers using radiocarbon age dating: Sacramento-San Joaquin River Basin, California

    James O. Sickman;Carol L. DiGiorgio;M. Lee Davisson;Delores M. Lucero

Frequent Co-Authors

John M. Melack
John M. Melack University of California, Santa Barbara
Thomas Meixner
Thomas Meixner University of Arizona
Noah P. Molotch
Noah P. Molotch University of Colorado Boulder
Joshua P. Schimel
Joshua P. Schimel University of California, Santa Barbara
Mark W. Williams
Mark W. Williams Institute of Arctic and Alpine Research
Mark E. Fenn
Mark E. Fenn US Forest Service
Andrzej Bytnerowicz
Andrzej Bytnerowicz US Forest Service
David W. Clow
David W. Clow United States Geological Survey
Edith B. Allen
Edith B. Allen University of California, Riverside
Sabine Grunwald
Sabine Grunwald University of Florida

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