Ocean Carbon Cycle
The ocean’s biological pump is a natural process by which photosynthesizing marine organisms sink to the ocean floor, thereby moving carbon from the surface layers (fast carbon) to the deep ocean (slow carbon).
Depth and location are critical factors for how effective the biological carbon pump is at moving carbon from fast to slow. Significant anthropogenic CO2 emissions have resulted in devastating levels of ocean acidification and myriad distressed ecosystems. Ocean acidification and warming also threaten to disrupt the biological carbon pump itself.
Running Tide aims to preserve and sustainably amplify the rate of the biological carbon pump, while simultaneously reducing the pH of the surface ocean and restoring natural ecosystems. Since only a small fraction of phytoplankton actually sinks to the deep ocean, removing carbon, one way we can improve the efficiency of the biological carbon pump is by using a material that has a better ratio of fast carbon sinking to surface remineralization, like macroalgae or terrestrial biomass residues. Utilizing a combination of ocean modeling and in-situ data collection, we also aim to ensure that our carbon-rich material sinks in parts of the ocean that are sufficiently deep for durable removal.
The ocean is dynamic and is in constant motion. These motions range in time scales from seconds to millennia, and in spatial scales from millimeters to the globe. Our current research identifies several ocean dynamics that we’ve identified as the most pertinent to Running Tide’s carbon removal pathways. These include:
- Running Tide White Paper: Carbon Removal is Mass Transfer from Fast to Slow Carbon Cycles
- Running Tide White Paper: Sustainably Amplifying the Natural Carbon Cycle
- Running Tide: We Have a Problem Statement Problem
- NOAA: Quantifying the Ocean Carbon Sink
- National Academy of Sciences: Metrics that matter for assessing the ocean biological carbon pump
- Ocean Visions: Macroalgae Cultivation & Sinking for Carbon Sequestration — A Framework for Global Research