We Built a Free Tool to List and Track How Our Ocean is Changing

Right now, as you read this, the ocean is quietly absorbing roughly a quarter of all the CO₂ humans release into the atmosphere. It has been doing this for decades — buffering us from the worst effects of climate change. But that service comes at a cost. The chemistry of our seas is shifting in ways that are measurable, accelerating, and increasingly irreversible.

Today, we are launching something we have been building for the SaveOcean community: a free, interactive directory of every major scientific dataset used to track ocean chemistry around the world.

CHECK THE LINK HERE

Why ocean chemistry data matters right now

Since the Industrial Revolution, human activities have released approximately 2,600 gigatonnes of CO₂ into the atmosphere. The ocean has absorbed around a quarter of all of it. That absorption has saved us from a significantly warmer world — but the chemical consequence is ocean acidification: surface ocean pH has already dropped by about 0.11 units, representing a roughly 30% increase in acidity since 1750.

That number sounds small. It is not. Marine organisms — corals, oysters, clams, sea urchins, plankton — build their shells and skeletons from calcium carbonate. As the ocean becomes more acidic, that building material becomes harder to access. The consequences ripple up the food chain.

⚠ What’s happening right now

• Coastal seas are acidifying faster than expected. Research published in November 2025 found that upwelling regions like the California Current are acidifying at rates far exceeding what atmospheric CO₂ alone would predict — intensifying impacts on fisheries and shellfish.
• Oyster shell formation is being disrupted. New research published in March 2026 shows ocean acidification disrupts calcium signaling in eastern oysters at the cellular level — threatening shellfish aquaculture globally.
• Coral reef fish gut microbiomes are being reshaped. Marine heatwaves combined with acidification are restructuring the microbial communities that reef fish depend on, with unknown long-term consequences for reef ecosystem health.
• If emissions continue unchecked, surface ocean pH could fall by a further 0.3 to 0.4 by 2100 — equivalent to a 100–150% increase in acidity on top of what has already occurred.

What we built — and why

In February 2026, a landmark paper was published in Earth System Science Data by 59 scientists from institutions across 20 countries. Led by NOAA’s Li-Qing Jiang, it catalogued every major data product that scientists use to track ocean carbonate chemistry — the suite of chemical measurements that tell us how acidic the ocean is, how much CO₂ it is absorbing, and where the most vulnerable zones are.

The paper is authoritative, rigorous, and indispensable — and almost completely inaccessible to anyone who isn’t an oceanographer. The product descriptions span 58 dense pages. The summary tables require specialist knowledge to interpret. The limitations of each dataset — critical for anyone wanting to use or cite this data — are scattered across paragraphs of technical prose.

“The most important ocean chemistry reference of 2026 was hidden inside 58 pages of scientific text. We built the directory because the ocean doesn’t have the luxury of waiting for people to find the right data.”

So we built a plain-language, interactive version. Every one of the 68 products is summarised in plain English. Every product has its key limitations clearly flagged. Everything is searchable by name, region, variable, or method. It works on any device. And it is completely free.

How to use the directory

1. Browse by category: Use the sidebar tabs to filter by category — cruise compilations, time-series stations, surface gridded products, interior ocean products, multi-product analyses, or model projections. Each serves a different purpose.
2. Search by what you need: Type a region (e.g. “Arctic”, “Indian Ocean”, “Caribbean”), a variable (e.g. “pH”, “aragonite”, “alkalinity”), or a method (e.g. “machine learning”, “time-series”) to find relevant products instantly.
3. Click any product to expand it: Each entry shows the key highlight, geographic coverage, scope, variables provided, known limitations, and a direct link to the dataset or DOI. One product open at a time keeps scrolling minimal.
4. Pay attention to the limitations: Every product has 3 expert-annotated known limitations. These are critical — a dataset that covers 1982–2016 cannot tell you what is happening today. A product built on open-ocean data cannot represent coastal chemistry. Understanding what the data cannot do is just as important as knowing what it can.

📊 What the data gap means in practice

• The Southern Ocean absorbs a disproportionate share of anthropogenic CO₂ — but it is among the least-sampled ocean regions on Earth.
• Coastal seas — where acidification most directly threatens fisheries and food security — have only ~10 dedicated products out of 68. The other 58 focus primarily on the open ocean.
• The Global South, whose coastal communities are most vulnerable to acidification impacts, has the least observational coverage. The authors who wrote the paper are predominantly from North America and Europe.
• Machine learning can fill gaps in space and time — but cannot create knowledge from data that was never collected. All 12+ ML methods in the directory converge on the same uncertainty ceiling.

What you can do

✅ Actions that matter

• Use the directory. Whether you are a researcher, journalist, teacher, policymaker, or concerned citizen — the data is now accessible. Knowing which datasets exist and what they can and cannot tell you is the first step.
• Share this post. Ocean acidification is under-covered relative to its importance. Every share puts this data in front of someone who might act on it.
• Support coastal monitoring. Advocate for investment in coastal ocean chemistry data — particularly in the Global South, where communities are most vulnerable and data is most sparse.
• Hold policymakers accountable. Surface ocean pH, aragonite saturation, and air-sea CO₂ flux are not abstract numbers. They are measurable indicators of how fast we are changing the ocean. Demand they be tracked, reported, and acted upon.
• Reduce your carbon footprint. The most direct driver of ocean acidification is atmospheric CO₂. Everything we do to reduce emissions buys the ocean — and the communities that depend on it — time.

📚 Source & citation

This directory is based on: Jiang, L.-Q. et al. (2026). Synthesis of data products for ocean carbonate chemistry. Earth System Science Data, 18, 1405–1462. doi: 10.5194/essd-18-1405-2026. The live product registry is maintained at oceanco2.github.io/co2-products. Limitation annotations reflect expert review of the paper; they are not endorsed by the original authors.