# Alessandro Tagliabue
Alessandro Tagliabue is an ocean biogeochemist and Professor of Earth, Ocean, and Ecological Sciences at the [University of Liverpool](https://www.edgepedia.org/university-of-liverpool), where he has held a Personal Chair since 1 October 2018.[1](https://orcid.org/0000-0002-3572-3634) He studies how trace micronutrients, above all iron, shape marine primary production, ecosystem structure, and the global carbon cycle, combining numerical models with fieldwork and dataset synthesis.[2](http://pcwww.liv.ac.uk/~atagliab/) He is heavily involved in the international [GEOTRACES](https://www.edgepedia.org/geotraces) program, served as a lead author on the IPCC Special Report on the Ocean and [Cryosphere](https://www.edgepedia.org/cryosphere) in a Changing Climate, and led the Tara Oceans Weddell Sea expedition.[2](http://pcwww.liv.ac.uk/~atagliab/)
| Fact | Detail |
|---|---|
| Current position | Personal Chair (Professor), Earth, Ocean, and Ecological Sciences, University of Liverpool, since 1 October 2018[1](https://orcid.org/0000-0002-3572-3634) |
| PhD | Stanford University, 2006, thesis on the carbon cycle of the Ross Sea, Antarctica[3](https://www.liverpool.ac.uk/people/alessandro-tagliabue/research-outputs) |
| Central research question | Iron cycling in the ocean and its control on marine ecosystems and carbon[2](http://pcwww.liv.ac.uk/~atagliab/) |
| Signature work | First intercomparison of 13 global ocean iron models against GEOTRACES data, *Global Biogeochemical Cycles*, 2016[4](https://ddd.uab.cat/pub/artpub/2016/188433/globiocyc_a2016v30p149.pdf) |
| Major grant | £4 million NERC IronMan project on iron and manganese in the Southern Ocean[5](https://www.liverpool.ac.uk/researcher/news/articles/new-4m-project-to-better-predict-response-of-southern-ocean-to-climate-change) |
| Society roles | UK Chair for SCOR; Royal Society Global Environment Research Committee; Challenger Society governing council[2](http://pcwww.liv.ac.uk/~atagliab/) |
## Education and career
Tagliabue completed his PhD at Stanford University in 2006 with a thesis titled *Exploring the Controls of the Cycle of Carbon in the Ross Sea (Antarctica)*.[3](https://www.liverpool.ac.uk/people/alessandro-tagliabue/research-outputs) His doctoral-era work examined iron in the [Ross Sea](https://www.edgepedia.org/ross-sea), including a 2005 paper on iron's impact on CO2 fluxes through phytoplankton functional groups and non-Redfield stoichiometry, and a 2006 paper on processes governing iron supply to phytoplankton in stratified seas, both in *Journal of Geophysical Research: Oceans*.[3](https://www.liverpool.ac.uk/people/alessandro-tagliabue/research-outputs)
At Liverpool he has held a Personal Chair since 2018.[1](https://orcid.org/0000-0002-3572-3634) He became UK Chair for the [Scientific Committee on Oceanic Research](https://www.edgepedia.org/scientific-committee-on-oceanic-research) (SCOR), joined the Royal Society Global Environment Research Committee, and joined the governing council of the UK Challenger Society for Marine Science.[2](http://pcwww.liv.ac.uk/~atagliab/)
## Representative work
His 2017 *Nature* review is ["The integral role of iron in ocean biogeochemistry"](https://doi.org/10.1038/nature21058).
His 2016 paper in *Global Biogeochemical Cycles*, ["How well do global ocean biogeochemistry models simulate dissolved iron distributions?"](https://doi.org/10.1002/2015GB005289), led the first intercomparison of 13 global ocean iron models against GEOTRACES sections. All models performed relatively poorly against a global dissolved iron dataset of around 20,000 observations, and models incorporating multiple iron sources and internal cycling subtleties did better, particularly in the ocean interior.[4](https://ddd.uab.cat/pub/artpub/2016/188433/globiocyc_a2016v30p149.pdf) GEOTRACES itself highlights this study as the first such intercomparison and notes the large disparity in iron residence times across models, reflecting a lack of agreement on how the iron cycle should be represented.[6](https://www.geotraces.org/global-ocean-biogeochemistry-models/)
*Persistent equatorial Pacific iron limitation under ENSO forcing* combined field nutrient-addition experiments, proteomics, and satellite radiometry to show that physical forcing drove coherent fluctuations in equatorial Pacific iron limitation through multiple [El Niño](https://www.edgepedia.org/el-nino)/Southern Oscillation cycles, with phytoplankton responses producing roughly threefold changes in chlorophyll-normalized fluorescence; a state-of-the-art climate model overestimated this variability twofold.[7](https://www.nature.com/articles/s41586-023-06439-0) *Authigenic mineral phases as a driver of the upper-ocean iron cycle* used a new seasonal dataset from the [Bermuda Atlantic Time-series Study](https://www.edgepedia.org/bermuda-atlantic-time-series-study) region to show dissolved iron dynamics decoupled from ligands, requiring a "colloidal shunt" in which dissolved iron escapes ligand stabilization into authigenic particles that settle to depth; implemented in a global model, this mechanism reproduced observations where previous models failed.[8](https://www.nature.com/articles/s41586-023-06210-5) The third was a *Nature* comment, "'Oceans are hugely complex': modelling marine microbes is key to climate forecasts", published 9 November 2023.[1](https://orcid.org/0000-0002-3572-3634)
## Models, intercomparisons and climate forecasts
Tagliabue works on the iron component of the PISCES biogeochemical model, which is a core component of the IPSL coupled climate model and has been used in the CMIP5 and CMIP6 model intercomparison exercises.[9](https://archimer.ifremer.fr/doc/00652/76417/77470.pdf) He acts as co-chair facilitating datasets for the Iron Model Intercomparison Project (FeMIP).[10](https://scor-int.org/Annual%20Meetings/2016GM/FeMIP.pdf) His argument in the 2023 *Nature* comment is that representing marine microbial complexity is key to climate forecasts.[1](https://orcid.org/0000-0002-3572-3634) A model study he led quantified the stakes: under a high-emissions scenario, 21st-century impacts on eastern equatorial Pacific net primary production range from −12.3% to +2.4% depending on assumptions about phytoplankton iron uptake, and end-of-century upper trophic level biomass projections are altered by 50%–80% across plausible biological scenarios.[9](https://archimer.ifremer.fr/doc/00652/76417/77470.pdf)
## Recent developments
Tagliabue leads the £4 million NERC-funded IronMan project, which brings together four+ UK universities and six+ international partner organizations to study the role of iron and manganese in regulating the [Southern Ocean](https://www.edgepedia.org/southern-ocean), an issue he says current models overlook.[5](https://www.liverpool.ac.uk/researcher/news/articles/new-4m-project-to-better-predict-response-of-southern-ocean-to-climate-change) His output through 2026 includes, per the University of Liverpool research outputs page, *The Evolution of Southern Ocean Net Primary Production in a Changing Climate* (*Global Change Biology*, 2025), *Novel Insights into Ocean Trace Element Cycling from Biogeochemical Models* (*Oceanography*, 2024), and a couple of 2026 *Geophysical Research Letters* papers on uncertainty in ocean productivity projections and on equation discovery for biogeochemical parameterizations.[3](https://www.liverpool.ac.uk/people/alessandro-tagliabue/research-outputs) • [1](https://orcid.org/0000-0002-3572-3634) An Author Correction to the authigenic mineral phases paper appeared in *Nature* on 10 July 2026.[1](https://orcid.org/0000-0002-3572-3634)
## References
1. [Alessandro Tagliabue (0000-0002-3572-3634), ORCID](https://orcid.org/0000-0002-3572-3634)
2. [Home, personal page of Alessandro Tagliabue](http://pcwww.liv.ac.uk/~atagliab/)
3. [Research outputs, Professor Alessandro Tagliabue, University of Liverpool](https://www.liverpool.ac.uk/people/alessandro-tagliabue/research-outputs)
4. [How well do global ocean biogeochemistry models simulate dissolved iron distributions? *Global Biogeochemical Cycles*, 2016](https://ddd.uab.cat/pub/artpub/2016/188433/globiocyc_a2016v30p149.pdf)
5. [New £4M project to better predict response of Southern Ocean to climate change, University of Liverpool](https://www.liverpool.ac.uk/researcher/news/articles/new-4m-project-to-better-predict-response-of-southern-ocean-to-climate-change)
6. [Are the dissolved iron distributions well represented by the global ocean biogeochemistry models? GEOTRACES](https://www.geotraces.org/global-ocean-biogeochemistry-models/)
7. [Persistent equatorial Pacific iron limitation under ENSO forcing, *Nature*, 2023](https://www.nature.com/articles/s41586-023-06439-0)
8. [Authigenic mineral phases as a driver of the upper-ocean iron cycle, *Nature*, 2023](https://www.nature.com/articles/s41586-023-06210-5)
9. [An iron cycle cascade governs the response of equatorial Pacific ecosystems to climate change](https://archimer.ifremer.fr/doc/00652/76417/77470.pdf)
10. [Iron Model Intercomparison Project (FeMIP) working group document, SCOR, 2016](https://scor-int.org/Annual%20Meetings/2016GM/FeMIP.pdf)
---
*Topic: Encyclopedia › Physical world and mathematics › Physical and mathematical scientists › Earth and climate scientists › Researchers in climate, atmospheric, and ocean science › Carbon cycle and biogeochemistry*
*Initially written Sep 21, 2026 · Reviewed: Sep 25, 2026; Sep 30, 2026 · Edited: Sep 25, 2026; Sep 30, 2026; Oct 11, 2026; Oct 15, 2026 · Last review: Sep 30, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license