Four research organizations have formed the ExOIS Field Research Coalition, a voluntary body that will set shared standards for ocean iron fertilization (OIF) field research as a marine carbon dioxide removal (mCDR) pathway.

Exploring Ocean Iron Solutions (ExOIS) convened the coalition, which unites independent organizations running OIF field programs across different ocean regions. Founding members include ExOIS, Growing Oceans, Oceanry, and the Southern Ocean Field Experiment Consortium. All four have signed a voluntary charter committing to scientific excellence, environmental stewardship, transparency, scientific independence, collaborative learning, and research conducted in the public interest.

The charter carries one provision that separates the coalition from the commercial mCDR sector: members agree not to seek direct financial gain from their OIF research during the experimental phase, including through the sale of carbon credits and offsets. The clause exists to keep research findings impartial and independent at a stage when the underlying science remains unproven.

How the pathway works

OIF involves adding small amounts of iron to iron-limited ocean regions, where the nutrient stimulates phytoplankton growth. That growth enhances natural processes that move CO2 from surface ocean layers into deeper waters. Whether fertilization produces durable sequestration, and at what ecological cost, remains the central open question the coalition says requires coordinated field study.

The coalition plans to advance scientific understanding through greater coordination, information sharing, transparency, and common standards for responsible research — effectively a self-regulatory framework in a field where international rules for open-ocean experiments are still evolving.

Existing field programs form the base

Each founding member brings an active research program. ExOIS is developing the North Pacific Carbon Study in the iron-limited Northeast Pacific. Growing Oceans has completed initial field research in low-nutrient, low-chlorophyll waters near Tonga. Oceanry is drafting plans for ocean iron research in the North Atlantic, and the Southern Ocean Field Experiment Consortium is working toward field research in the Southern Ocean.

The spread matters. The four programs cover distinct oceanographic regimes — subarctic Pacific, South Pacific gyre margins, North Atlantic, and Southern Ocean — meaning shared measurement standards could allow results from separate experiments to be compared rather than treated as isolated datasets.

Ken Buesseler, Executive Director of ExOIS and Emeritus Research Scholar at the Woods Hole Oceanographic Institution (WHOI), framed the coalition's rationale in terms of urgency balanced against rigor.

"We need to better understand potential climate solutions as soon as possible, but that urgency must be matched by scientific rigor and environmental responsibility," Buesseler said. "Working together in this way can help us learn more and learn faster while establishing shared expectations for responsible and independent research."

What to watch

The commitment not to monetize research findings during the experimental phase is a pledge with an implicit deadline structure: it holds until members decide the science has moved beyond experimentation. When and how that transition occurs — and whether independent research standards survive contact with carbon market economics — will test the charter's substance.

The next concrete milestones are the launch of the North Pacific Carbon Study and the progression of the Southern Ocean and North Atlantic programs from planning into the field. Each experiment will also operate under whatever national permitting regimes and international marine research rules apply in its jurisdiction, and those regulatory pathways will shape the pace at which OIF data actually accumulates.