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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Earth Science 62 1646 1474 724 632 232 17955

Howard J. Spero publications per year

The chart shows the history of publications by Howard J. Spero between 1979 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Howard J. Spero published across 47 years, from 1979 to 2025, averaging 5.3 papers a year. Output peaked at 15 publications in 2004. 5 of the 251 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1979 to 2025. Vertical axis: number of publications, 0 to 15. Peak 15 publications in 2004. 1979: 1 publication 1980: 0 publications 1981: 2 publications 1982: 2 publications 1983: 0 publications 1984: 0 publications 1985: 1 publication 1986: 0 publications 1987: 2 publications 1988: 4 publications 1989: 2 publications 1990: 6 publications 1991: 2 publications 1992: 2 publications 1993: 3 publications 1994: 1 publication 1995: 3 publications 1996: 6 publications 1997: 3 publications 1998: 6 publications 1999: 7 publications 2000: 7 publications 2001: 7 publications 2002: 10 publications 2003: 13 publications 2004: 15 publications 2005: 11 publications 2006: 5 publications 2007: 6 publications 2008: 5 publications 2009: 6 publications 2010: 5 publications 2011: 7 publications 2012: 7 publications 2013: 14 publications 2014: 11 publications 2015: 10 publications 2016: 14 publications 2017: 6 publications 2018: 9 publications 2019: 3 publications 2020: 11 publications 2021: 4 publications 2022: 1 publication 2023: 6 publications 2024: 2 publications 2025: 3 publications
1979 2025

251 publications in total across all disciplines

View publications per year as a table
Howard J. Spero: publications per year, 1979 to 2025
Year Publications
1979 1
1980 0
1981 2
1982 2
1983 0
1984 0
1985 1
1986 0
1987 2
1988 4
1989 2
1990 6
1991 2
1992 2
1993 3
1994 1
1995 3
1996 6
1997 3
1998 6
1999 7
2000 7
2001 7
2002 10
2003 13
2004 15
2005 11
2006 5
2007 6
2008 5
2009 6
2010 5
2011 7
2012 7
2013 14
2014 11
2015 10
2016 14
2017 6
2018 9
2019 3
2020 11
2021 4
2022 1
2023 6
2024 2
2025 3
Total 251
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Howard J. Spero publication distribution in Earth Science in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Earth Science in 2026. The highlighted bar marks where Howard J. Spero sits on this spectrum.

No. of scientists
100 200 300 400 500
Bar chart with 58 bars. Horizontal axis: publications, 38–47 to 603+. Vertical axis: number of scientists, 0 to 557. Most scientists, 557, have 128–137 publications. The last bar groups every scientist with 603 publications or more. The highlighted bar, 228–237 publications, is where this scientist sits. 38–47 publications: 5 scientists 48–57 publications: 33 scientists 58–67 publications: 94 scientists 68–77 publications: 161 scientists 78–87 publications: 278 scientists 88–97 publications: 376 scientists 98–107 publications: 404 scientists 108–117 publications: 484 scientists 118–127 publications: 540 scientists 128–137 publications: 557 scientists 138–147 publications: 491 scientists 148–157 publications: 495 scientists 158–167 publications: 458 scientists 168–177 publications: 490 scientists 178–187 publications: 414 scientists 188–197 publications: 401 scientists 198–207 publications: 333 scientists 208–217 publications: 292 scientists 218–227 publications: 290 scientists 228–237 publications: 262 scientists 238–247 publications: 243 scientists 248–257 publications: 208 scientists 258–267 publications: 185 scientists 268–277 publications: 147 scientists 278–287 publications: 128 scientists 288–297 publications: 119 scientists 298–307 publications: 120 scientists 308–317 publications: 107 scientists 318–327 publications: 93 scientists 328–337 publications: 87 scientists 338–347 publications: 64 scientists 348–357 publications: 87 scientists 358–367 publications: 60 scientists 368–377 publications: 60 scientists 378–387 publications: 34 scientists 388–397 publications: 50 scientists 398–407 publications: 44 scientists 408–417 publications: 31 scientists 418–427 publications: 39 scientists 428–437 publications: 27 scientists 438–447 publications: 36 scientists 448–457 publications: 27 scientists 458–467 publications: 29 scientists 468–477 publications: 30 scientists 478–487 publications: 19 scientists 488–497 publications: 15 scientists 498–507 publications: 18 scientists 508–517 publications: 19 scientists 518–527 publications: 16 scientists 528–537 publications: 10 scientists 538–547 publications: 11 scientists 548–557 publications: 14 scientists 558–567 publications: 11 scientists 568–577 publications: 7 scientists 578–587 publications: 14 scientists 588–597 publications: 5 scientists 598–602 publications: 4 scientists 603+ publications: 100 scientists
38–47 publications 603+

This scientist: 232 publications — 73rd percentile

73% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 603 publications or more.

View publications distribution as a table
Number of Earth Science scientists by publication count, Research.com 2026 ranking edition. Based on 9,176 ranked scientists.
Publications Scientists This scientist
38–47 5
48–57 33
58–67 94
68–77 161
78–87 278
88–97 376
98–107 404
108–117 484
118–127 540
128–137 557
138–147 491
148–157 495
158–167 458
168–177 490
178–187 414
188–197 401
198–207 333
208–217 292
218–227 290
228–237 262 232
238–247 243
248–257 208
258–267 185
268–277 147
278–287 128
288–297 119
298–307 120
308–317 107
318–327 93
328–337 87
338–347 64
348–357 87
358–367 60
368–377 60
378–387 34
388–397 50
398–407 44
408–417 31
418–427 39
428–437 27
438–447 36
448–457 27
458–467 29
468–477 30
478–487 19
488–497 15
498–507 18
508–517 19
518–527 16
528–537 10
538–547 11
548–557 14
558–567 11
568–577 7
578–587 14
588–597 5
598–602 4
603+ 100
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Howard J. Spero D-index placement in Earth Science in 2026

The chart shows the D-index (discipline H-index) distribution of Earth Science scientists ranked by Research.com in 2026. The highlighted bar marks where Howard J. Spero sits on this spectrum.

No. of scientists
100 200 300
Bar chart with 77 bars. Horizontal axis: D-Index, 30 to 106+. Vertical axis: number of scientists, 0 to 389. Most scientists, 389, have 36 D-Index. The last bar groups every scientist with 106 D-Index or more. The highlighted bar, 62 D-Index, is where this scientist sits. 30 D-Index: 144 scientists 31 D-Index: 215 scientists 32 D-Index: 278 scientists 33 D-Index: 379 scientists 34 D-Index: 366 scientists 35 D-Index: 372 scientists 36 D-Index: 389 scientists 37 D-Index: 366 scientists 38 D-Index: 344 scientists 39 D-Index: 349 scientists 40 D-Index: 296 scientists 41 D-Index: 289 scientists 42 D-Index: 277 scientists 43 D-Index: 279 scientists 44 D-Index: 248 scientists 45 D-Index: 257 scientists 46 D-Index: 212 scientists 47 D-Index: 202 scientists 48 D-Index: 207 scientists 49 D-Index: 204 scientists 50 D-Index: 183 scientists 51 D-Index: 178 scientists 52 D-Index: 182 scientists 53 D-Index: 178 scientists 54 D-Index: 163 scientists 55 D-Index: 117 scientists 56 D-Index: 163 scientists 57 D-Index: 120 scientists 58 D-Index: 113 scientists 59 D-Index: 136 scientists 60 D-Index: 135 scientists 61 D-Index: 96 scientists 62 D-Index: 103 scientists 63 D-Index: 83 scientists 64 D-Index: 103 scientists 65 D-Index: 83 scientists 66 D-Index: 89 scientists 67 D-Index: 92 scientists 68 D-Index: 89 scientists 69 D-Index: 78 scientists 70 D-Index: 75 scientists 71 D-Index: 53 scientists 72 D-Index: 62 scientists 73 D-Index: 54 scientists 74 D-Index: 35 scientists 75 D-Index: 52 scientists 76 D-Index: 50 scientists 77 D-Index: 32 scientists 78 D-Index: 37 scientists 79 D-Index: 20 scientists 80 D-Index: 33 scientists 81 D-Index: 36 scientists 82 D-Index: 34 scientists 83 D-Index: 34 scientists 84 D-Index: 24 scientists 85 D-Index: 19 scientists 86 D-Index: 18 scientists 87 D-Index: 26 scientists 88 D-Index: 30 scientists 89 D-Index: 17 scientists 90 D-Index: 21 scientists 91 D-Index: 19 scientists 92 D-Index: 15 scientists 93 D-Index: 14 scientists 94 D-Index: 20 scientists 95 D-Index: 9 scientists 96 D-Index: 10 scientists 97 D-Index: 15 scientists 98 D-Index: 13 scientists 99 D-Index: 3 scientists 100 D-Index: 13 scientists 101 D-Index: 3 scientists 102 D-Index: 9 scientists 103 D-Index: 4 scientists 104 D-Index: 6 scientists 105 D-Index: 6 scientists 106+ D-Index: 98 scientists
30 D-Index 106+

This scientist: 62 D-Index — 82nd percentile

82% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 106 D-Index or more.

View D-Index distribution as a table
Number of Earth Science scientists by D-index, Research.com 2026 ranking edition. Based on 9,176 ranked scientists.
D-Index Scientists This scientist
30 144
31 215
32 278
33 379
34 366
35 372
36 389
37 366
38 344
39 349
40 296
41 289
42 277
43 279
44 248
45 257
46 212
47 202
48 207
49 204
50 183
51 178
52 182
53 178
54 163
55 117
56 163
57 120
58 113
59 136
60 135
61 96
62 103 62
63 83
64 103
65 83
66 89
67 92
68 89
69 78
70 75
71 53
72 62
73 54
74 35
75 52
76 50
77 32
78 37
79 20
80 33
81 36
82 34
83 34
84 24
85 19
86 18
87 26
88 30
89 17
90 21
91 19
92 15
93 14
94 20
95 9
96 10
97 15
98 13
99 3
100 13
101 3
102 9
103 4
104 6
105 6
106+ 98
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Research.com Recognitions

  • 2014 - Fellow of American Geophysical Union (AGU)
  • 2012 - Fellow of the American Association for the Advancement of Science (AAAS)
  • Fellow of the Geological Society of America
  • Fellow of the Geological Society of America
  • Fellow of the Geological Society of America
  • Fellow of the Geological Society of America

Overview

Howard J. Spero is affiliated with the University of California, Davis in the United States. Their research primarily focuses on Earth and Planetary Sciences as well as Environmental Science, supported by a significant number of publications in these fields.

Their work spans several subfields including Atmospheric Science, Ecology, Paleontology, Oceanography, and Anthropology. The main topics of research covered by Spero include Geology and Paleoclimatology Research, Isotope Analysis in Ecology, Marine Biology and Ecology Research, Archaeology and ancient environmental studies, Paleontology and Stratigraphy of Fossils, Pleistocene-Era Hominins and Archaeology, and Geochemistry and Elemental Analysis.

Spero has contributed to a range of peer-reviewed papers. Notable recent publications include:

  • High-precision stable isotope analysis of <5 μg CaCO 3 samples by continuous-flow mass spectrometry (2020) published in Rapid Communications in Mass Spectrometry
  • Constraining multiple controls on planktic foraminifera Mg/Ca (2020) published in Geochimica et Cosmochimica Acta
  • Ammonium is the preferred source of nitrogen for planktonic foraminifer and their dinoflagellate symbionts (2020) published in Proceedings of the Royal Society B Biological Sciences
  • Comparison of Laser Ablation and Solution-Based ICP-MS Results for Individual Foraminifer Mg/Ca and Sr/Ca Analyses (2020) published in Geochemistry Geophysics Geosystems
  • High-Resolution Mg/Ca and δ18O Patterns in Modern Neogloboquadrina pachyderma From the Fram Strait and Irminger Sea (2020) published in Paleoceanography and Paleoclimatology

Their collaborations include frequent co-authorship with Jennifer S. Fehrenbacher, Reinhard Kozdon, Caitlin M. Livsey, Dorothea Bauch, and Geert-Jan A Brummer.

Spero's work is often published in venues such as the Publishing Network for Geoscientific and Environmental Data (PANGAEA) from the Alfred Wegener Institute for Polar and Marine Research, Rapid Communications in Mass Spectrometry, Geochimica et Cosmochimica Acta, California Archaeology, and Zenodo at CERN.

Their professional recognition includes fellowships awarded by prominent scientific organizations, namely the American Geophysical Union (AGU) in 2014, the American Association for the Advancement of Science (AAAS) in 2012, and the Geological Society of America. These fellowships acknowledge their contributions and standing in the scientific community.

Best Publications

  • Climate Impact of Late Quaternary Equatorial Pacific Sea Surface Temperature Variations

    David W. Lea;Dorothy K. Pak;Howard J. Spero

  • Reevaluation of the oxygen isotopic composition of planktonic foraminifera: Experimental results and revised paleotemperature equations

    Bryan E. Bemis;Howard J. Spero;Jelle Bijma;David W. Lea

  • Effect of seawater carbonate concentration on foraminiferal carbon and oxygen isotopes

    Howard J. Spero;Jelle Bijma;David W. Lea;Bryan E. Bemis

  • Controls on magnesium and strontium uptake in planktonic foraminifera determined by live culturing

    David W. Lea;Tracy A. Mashiotta;Howard J. Spero

  • Core top calibration of Mg/Ca in tropical foraminifera: Refining paleotemperature estimation

    Petra S. Dekens;Petra S. Dekens;David W. Lea;Dorothy K. Pak;Howard J. Spero

  • Constraints on the magnitude and patterns of ocean cooling at the Last Glacial Maximum

    C. Waelbroeck;A. Paul;M. Kucera;A. Rosell-Melé

  • Effects of seawater carbonate ion concentration and temperature on shell U, Mg, and Sr in cultured planktonic foraminifera

    Ann D. Russell;Bärbel Hönisch;Howard J. Spero;David W. Lea

  • Glacial–interglacial changes in Subantarctic sea surface temperature and δ18O-water using foraminiferal Mg

    Tracy A. Mashiotta;David W. Lea;Howard J. Spero

  • Reconstructing a 350 ky history of sea level using planktonic Mg/Ca and oxygen isotope records from a Cocos Ridge core

    David W. Lea;Pamela A. Martin;Dorothy K. Pak;Howard J. Spero

  • Reassessing foraminiferal stable isotope geochemistry: Impact of the oceanic carbonate system (experimental results)

    Jelle Bijma;H. J. Spero;D. W. Lea

  • Experimental determination of stable isotope variability in Globigerina bulloides: implications for paleoceanographic reconstructions

    Howard J. Spero;David W. Lea

  • Links between salinity variation in the Caribbean and North Atlantic thermohaline circulation

    Matthew W. Schmidt;Howard J. Spero;David W. Lea

  • Intraspecific stable isotope variability in the planktic foraminiferaGlobigerinoides sacculifer: Results from laboratory experiments

    Howard J. Spero;David W. Lea

  • The Cause of Carbon Isotope Minimum Events on Glacial Terminations

    Howard J. Spero;David W. Lea

  • Multispecies approach to reconstructing eastern equatorial Pacific thermocline hydrography during the past 360 kyr

    Howard J. Spero;Koreen M. Mielke;Erica M. Kalve;David W. Lea

  • Oceanic pH control on the boron isotopic composition of foraminifera: Evidence from culture experiments

    A. Sanyal;N. G. Hemming;W. S. Broecker;David W. Lea

  • Biomineralization in perforate foraminifera

    L. J. De Nooijer;Howard Spero;J. Erez;J. Bijma

  • Model for kinetic effects on calcium isotope fractionation (δ44Ca) in inorganic aragonite and cultured planktonic foraminifera

    Nikolaus Gussone;Anton Eisenhauer;Alexander Heuser;Martin Dietzel

  • Paleoclimate history of Galapagos surface waters over the last 135,000 yr

    David W. Lea;Dorothy K. Pak;Christina L. Belanger;Howard J. Spero

  • Microsensor studies of photosynthesis and respiration in the symbiotic foraminifer Orbulina universa

    S. Rink;Michael Kühl;J. Bijma;H.J. Spero

  • Effect of seawater carbonate concentration on foraminiferal carbon and oxygen isotopes

    H.J. Spero;J. Bijma;D.W. Lea;B.E. Bernis

Frequent Co-Authors

David W. Lea
David W. Lea University of California, Santa Barbara
Jelle Bijma
Jelle Bijma Alfred Wegener Institute for Polar and Marine Research
Bärbel Hönisch
Bärbel Hönisch Lamont-Doherty Earth Observatory
Stephen Eggins
Stephen Eggins Australian National University
Anton Eisenhauer
Anton Eisenhauer GEOMAR Helmholtz Centre for Ocean Research Kiel
Trond Dokken
Trond Dokken NORCE Research
Anders Meibom
Anders Meibom École Polytechnique Fédérale de Lausanne
Stefan Mulitza
Stefan Mulitza University of Bremen
Elsa Cortijo
Elsa Cortijo Versailles Saint-Quentin-en-Yvelines University
Robert C. Thunell
Robert C. Thunell University of South Carolina

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