AI Article Synopsis
- Mariculture algae could help fight climate change by capturing carbon and removing nutrients, but their growth is currently facing problems.
- Between 2010 and 2020, research in Shandong Province, China, revealed that the ability of algae to sequester carbon and remove nitrogen and phosphorus has significantly decreased since 2014 due to limited area, changes in algae species, and unstable yields.
- The study suggests that implementing artificial upwelling (AU) could improve algae yields and potentially counteract the reductions in carbon sinking and nutrient removal, despite underlying challenges like low energy efficiency and high costs associated with AU.
Article Abstract
Mariculture algae may present a crucial part of ocean-based solutions for climate change, with the ability to sequester carbon and remove nutrients. However, the expansion of mariculture algae faces multiple challenges. Here, we measure the changes in algae derived carbon sinks and nitrogen (N) and phosphorus (P) removal between 2010 and 2020 in Shandong Province, China. We further identify the key driving factors, namely area, algal species proportion, and yield, that influence the changes. The results show that algae derived carbon sinks and nutrient removal growth rates in Shandong Province have slowed significantly since 2014, mainly due to area limitations, laver-oriented species change, and unstable yields. Artificial upwelling (AU) has the potential to enhance the yield and subsequently offset the loss of carbon sinks and nutrient removal caused by negative driving factors. Scenario analysis indicates that a complete deployment of AU by 2030 will offset up to a 44.52 % decrease in the mariculture algae area, or a 72.57 % increase in the laver share of the algal species combination compared to 2020. Similar conclusions are reached regarding the role of AU in N and P removal. This study also identifies ancillary challenges such as low energy efficiency and high costs faced by applying AU.
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| http://dx.doi.org/10.1016/j.scitotenv.2023.167150 | DOI Listing |
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