A buoy named Peggy bobs quietly in the dark, cold water somewhere in the Bering Sea, far from any shipping lanes or research ships. This is what she’s done since 1995. No big deal. Not any press releases. Only measurements of temperature, salinity, nitrate levels, and current were sent back to scientists on land. A lot of people have never heard of her. Still, Peggy and the hundreds of other ocean monitoring buoys that are spread out around the world’s seas are an important part of a system that scientists have been building for decades to keep track of what the planet is really doing, not what climate models say it might do.
The way these instruments work is almost poetic. They sit in places that people don’t usually go, like on the ocean floor or moving with the currents on the surface. They collect data that doesn’t make the news but is important to almost every serious conversation about climate science. About 30% of the carbon dioxide that is put into the air is taken up by the ocean. When that CO2 breaks down, it changes the chemistry of the ocean in ways that affect marine food chains. Many ecosystems need to be watched at the same time, in real time, and this is something that no single research ship or satellite can do.
This is exactly what NOAA’s network of fifty Moored Autonomous pCO₂ buoys, which are spread out from coral reefs to wide stretches of ocean, measures. One is at Cheeca Rocks in the Florida Keys. It’s a patch reef that scientists have been keeping an eye on with a mix of cautious optimism and hope. Even though disease and bleaching events have destroyed a lot of the marine life around it, this reef has stayed healthier than reefs farther out to sea. Once every three hours, the buoy writes down the CO2 pressure, salinity, temperature, and pH. It’s open to everyone. It’s the kind of boring scientific infrastructure that doesn’t get a Ted Talk but every season proves its worth.
More than just slow chemical shifts are being watched by buoys. The DART buoy network is there for a more important reason. Placed in a way that makes them sensitive to earthquakes, these instruments pick up the movement of tsunami waves as they pass over. The surface buoy talks to a sensor that is anchored to the seafloor. The buoy then sends wave information directly to the National Tsunami Warning Center in Alaska and the Pacific Tsunami Warning Center in Honolulu. There is still some risk with the system. But it cuts down on the time between detection and warning in ways that can really help coastal communities that might only have minutes or hours to act otherwise.
In the Indian Ocean, further south, a network called RAMA has been collecting data on the atmosphere and the ocean since 2004 to try to make monsoon forecasts more accurate. It’s simple to forget what that really means in real life. Thirty percent of the world’s people depend on rain from the monsoons to grow their own food. If the forecast is off by just one week, it can change what people plant across an entire subcontinent. RAMA buoys collect data on ocean temperature, wind speed, humidity, salinity, sea level pressure, and sea level. Each year, these data help us learn more about how the Indian Ocean affects weather systems that billions of people live in without even realizing it.
When you look at these buoys as a group, they represent something important. They’re not exciting. They don’t make pictures that make people feel anything. It’s hard to find a picture of a buoy that makes you understand how important climate science is right now. But the information they gather is what forecasts, warnings, and policy decisions are built on. It’s been almost 30 years since Peggy sent measurements from the Bering Sea. For twenty-five years, she sent weather reports and personal messages to sailors across the North Pacific from her home in Kodiak, Alaska. She was named after that woman. That kind of quiet work is done over and over again for people who might not always know that someone is looking out for them.
It’s changing in the ocean. There is no longer a serious question about that. It’s still not clear how fast, in what directions, and what effects it will have on coastlines, fisheries, and the weather systems that control daily life on land. Season after season, the buoys stand guard. It’s still not clear if the information they gather will be enough, or if people will believe the predictions and the warnings will come in time. Without them, though, there would be a lot more doubt. That’s not a small thing in this case.
