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D-Index & Metrics

Environmental Sciences

D-Index
61
Citations
17863
World Ranking
2718
National Ranking
1087

Isobel J. Simpson 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 Isobel J. Simpson 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: 164 publications — 49th percentile

49% of scientists in this discipline score the same or lower.

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

Isobel J. Simpson 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 Isobel J. Simpson 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: 61 D-Index — 72nd percentile

72% of scientists in this discipline score the same or lower.

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

Overview

Isobel J. Simpson is affiliated with the University of California, Irvine in the United States. Their research spans the fields of Earth and Planetary Sciences as well as Environmental Science. More specifically, their work focuses on Atmospheric Science and Global and Planetary Change, with additional interests in Health, Toxicology and Mutagenesis, Automotive Engineering, and Environmental Engineering.

Simpson's main research topics include:

  • Atmospheric chemistry and aerosols
  • Atmospheric Ozone and Climate
  • Air Quality and Health Impacts
  • Atmospheric and Environmental Gas Dynamics
  • Atmospheric aerosols and clouds
  • Vehicle emissions and performance
  • Fire effects on ecosystems

Their work has been published frequently in several venues, most notably:

  • Atmospheric chemistry and physics
  • Elementa Science of the Anthropocene
  • Journal of Advances in Modeling Earth Systems
  • Zenodo (CERN European Organization for Nuclear Research)
  • One Earth

Recent publications authored or co-authored by Isobel J. Simpson include:

  • Characterization, sources and reactivity of volatile organic compounds (VOCs) in Seoul and surrounding regions during KORUS-AQ, 2020, Elementa Science of the Anthropocene
  • The Korea-United States Air Quality (KORUS-AQ) field study, 2021, Elementa Science of the Anthropocene
  • The Global Methane Budget 2000-2017, 2020, NOAA Institutional Repository
  • The Chemistry Mechanism in the Community Earth System Model Version 2 (CESM2), 2020, Journal of Advances in Modeling Earth Systems
  • Correcting model biases of CO in East Asia: impact on oxidant distributions during KORUS-AQ, 2020, Atmospheric chemistry and physics

Frequent collaborators frequently working alongside Simpson include D. R. Blake, Simone Meinardi, J. H. Crawford, Alan Fried, and Jung-Hun Woo.

Best Publications

  • The global methane budget 2000–2017

    Marielle Saunois;Ann R. Stavert;Ben Poulter;Philippe Bousquet

  • Three decades of global methane sources and sinks

    Stefanie Kirschke;Philippe Bousquet;Philippe Ciais;Marielle Saunois

  • The global methane budget 2000–2012

    Marielle Saunois;Philippe Bousquet;Ben Poulter;Anna Peregon

  • The Chemistry Mechanism in the Community Earth System Model Version 2 (CESM2)

    Louisa K. Emmons;Rebecca H. Schwantes;Rebecca H. Schwantes;Rebecca H. Schwantes;John J. Orlando;Geoff Tyndall

  • Characterization of trace gases measured over Alberta oil sands mining operations: 76 speciated C 2 –C 10 volatile organic compounds (VOCs), CO 2 , CH 4 , CO, NO, NO 2 , NO y , O 3 and SO 2

    I. J. Simpson;N. J. Blake;B. Barletta;G. S. Diskin

  • C1–C8 volatile organic compounds in the atmosphere of Hong Kong: Overview of atmospheric processing and source apportionment

    Hai Guo;K. L. So;I. J. Simpson;B. Barletta

  • Mixing ratios of volatile organic compounds (VOCs) in the atmosphere of Karachi, Pakistan

    Barbara Barletta;Simone Meinardi;Isobel J Simpson;Haider A Khwaja

  • Airborne measurements of western U.S. wildfire emissions: Comparison with prescribed burning and air quality implications

    Xiaoxi Liu;Xiaoxi Liu;Xiaoxi Liu;L. Gregory Huey;Robert J. Yokelson;Vanessa Selimovic

  • Source contributions to ambient VOCs and CO at a rural site in eastern China

    H Guo;T Wang;I.J Simpson;D.R Blake

  • Source origins, modeled profiles, and apportionments of halogenated hydrocarbons in the greater Pearl River Delta region, southern China

    Hai Guo;A. J. Ding;Tao Wang;I. J. Simpson

  • Measurements of nonmethane hydrocarbons in 28 United States cities

    Angela K. Baker;Andreas J. Beyersdorf;Lambert A. Doezema;Aaron Katzenstein

  • Oxidative capacity and radical chemistry in the polluted atmosphere of Hong Kong and Pearl River Delta region: analysis of a severe photochemical smog episode

    Likun Xue;Rongrong Gu;Tao Wang;Xinfeng Wang

  • Boreal forest fire emissions in fresh Canadian smoke plumes: C 1 -C 10 volatile organic compounds (VOCs), CO 2 , CO, NO 2 , NO, HCN and CH 3 CN

    Isobel J. Simpson;S. K. Akagi;B. Barletta;N. J. Blake

  • Field measurements of trace gases and aerosols emitted by peat fires in Central Kalimantan, Indonesia, during the 2015 El Niño

    Chelsea E. Stockwell;Chelsea E. Stockwell;Thilina Jayarathne;Mark A. Cochrane;Kevin C. Ryan

  • Ambient mixing ratios of nonmethane hydrocarbons (NMHCs) in two major urban centers of the Pearl River Delta (PRD) region: Guangzhou and Dongguan

    Barbara Barletta;Simone Meinardi;Isobel J. Simpson;Shichun Zou

  • Long-term decline of global atmospheric ethane concentrations and implications for methane

    Isobel J. Simpson;Mads P. Sulbaek Andersen;Mads P. Sulbaek Andersen;Simone Meinardi;Lori Bruhwiler

  • The Korea–United States Air Quality (KORUS-AQ) field study

    James H. Crawford;Joon-Young Ahn;Jassim Al-Saadi;Limseok Chang

  • Tropospheric volatile organic compounds in China

    Hai Guo;Z.H. Ling;H.R. Cheng;Isobel Simpson

  • Measurements of reactive trace gases and variable O3 formation rates in some South Carolina biomass burning plumes

    S. K. Akagi;Robert J. Yokelson;I. R. Burling;S. Meinardi

  • Emissions of Trace Gases and Particles from Savanna Fires in Southern Africa

    Parikhit Sinha;Peter V. Hobbs;Robert J. Yokelson;Isaac T. Bertschi

  • Representation of the Community Earth System Model (CESM1) CAM4-chem within the Chemistry-Climate Model Initiative (CCMI)

    Simone Tilmes;Jean Francois Lamarque;Louisa K. Emmons;Doug E. Kinnison

  • Scientific Assessment of Ozone Depletion: 2010

    S. A. Montzka;S. Reimann;A. Engel;K. Kruger

  • Global Methane Budget 2000-2012

    M. Saunois;P. Bousquet;B. Poulter;A. Peregon

Frequent Co-Authors

Donald R. Blake
Donald R. Blake University of California, Irvine
Simone Meinardi
Simone Meinardi University of California, Irvine
Nicola J. Blake
Nicola J. Blake University of California, Irvine
Hai Guo
Hai Guo Hong Kong Polytechnic University
F. Sherwood Rowland
F. Sherwood Rowland University of California, Irvine
Paul B. Krummel
Paul B. Krummel Commonwealth Scientific and Industrial Research Organisation
Tao Wang
Tao Wang Hong Kong Polytechnic University
Glenn S. Diskin
Glenn S. Diskin Langley Research Center
Xinming Wang
Xinming Wang Chinese Academy of Sciences
Henry E. Fuelberg
Henry E. Fuelberg Florida State University

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