World's Best Scientists 2026 revealed!

D-Index & Metrics

Environmental Sciences

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

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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