研究人员使用了地球系统模型，研究表明，在重磷酸盐条件下，浮游植物对磷的利用可以过度补偿先前预测的21世纪由于海洋变暖和层化增强而导致的下降。研究结果得到了夏威夷海洋时间序列项目观测项目的支持，表明亚热带海洋的营养吸收可塑性在全球变暖中维持浮游植物生产力和碳输出生产方面发挥着关键作用。
据介绍，每年都有大约500亿吨的溶解无机碳被海洋浮游生物转化为颗粒和溶解有机碳，其中一部分通过生物碳泵输出到深海区域。尽管海洋净初级生产力再通过碳螯合调节大气二氧化碳和维持海洋生态系统方面发挥着重要作用，但模型预测的海洋净初级生产力的未来变化即使在变化的迹象方面也非常不确定。
附：英文原文
Title: Nutrient uptake plasticity in phytoplankton sustains future ocean net primary production
Author: Eun Young Kwon, M. G. Sreeush, Axel Timmermann, David M. Karl, Matthew J. Church, Sun-Seon Lee, Ryohei Yamaguchi
Issue&Volume: 2022-12-21
Abstract: Annually, marine phytoplankton convert approximately 50 billion tons of dissolved inorganic carbon to particulate and dissolved organic carbon, a portion of which is exported to depth via the biological carbon pump. Despite its important roles in regulating atmospheric carbon dioxide via carbon sequestration and in sustaining marine ecosystems, model-projected future changes in marine net primary production are highly uncertain even in the sign of the change. Here, using an Earth system model, we show that frugal utilization of phosphorus by phytoplankton under phosphate-stressed conditions can overcompensate the previously projected 21st century declines due to ocean warming and enhanced stratification. Our results, which are supported by observations from the Hawaii Ocean Time-series program, suggest that nutrient uptake plasticity in the subtropical ocean plays a key role in sustaining phytoplankton productivity and carbon export production in a warmer world.
DOI: add2475
Source: https://www.science.org/doi/10.1126/sciadv.add2475