Artificial Upwelling System Test (Xiamen) ─ A demo of engineering ocean carbon sequestration
Coastal area is an important potential site for the implementation of carbon sequestration engineering. Some implementable projects (such as ocean iron fertilization, artificial upwelling, etc.) are aimed at improving marine carbon storage capacity and increasing marine carbon sinks. In most sea areas, such as large continental shelf areas, nutrient availability (nitrogen, phosphorus, silicon, and trace elements such as iron) is one of the major factors limiting primary productivity. As a geo-engineering system, artificial upwelling can bring low-temperature, high-nutrient deep ocean water to the euphotic zone. This process not only increases the total nutrient concentration, but also adjusts the ratio of nitrogen/phosphorus/silicon/iron to promote photosynthesis, increase catches, and increase BP efficiency in exporting organic carbon to the deep sea. Therefore, artificial upwelling is considered a great prospect and can be used to stimulate the Earth's capability of self-healing engineering means.
One of the most serious challenges to an artificial upwelling system is the design and preparation of robust equipment capable of continuous operation in the complex marine environment. China's artificial upwelling system is on par with the advanced international level. A self-powered artificial upwelling system has been designed and tested to bring deep water to the euphotic zone by injecting compressed air. This highly efficient and durable artificial upwelling device has been put in trial in the Xiamen coastal waters. The results showed that low temperature deep water can be brought to the euphotic zone, which is expected to change the nutrients distribution to some extent, regulate the nitrogen/phosphorus ratio, and have a positive effect on increasing primary productivity locally. (WG33 co-chairs Nianzhi JIAO and Richard Rivkin attended)