Dissolved organic phosphorus concentrations in the surface ocean controlled by both phosphate and iron stress
Dissolved organic phosphorus concentrations in the surface ocean controlled by both phosphate and iron stress
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DOI：
10.1038/s41561-022-00988-1
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发表时间：
2022-07-21
影响因子：
18.3
通讯作者：
Knapp, Angela N.
中科院分区：
文献类型：
--
作者：
Liang, Zhou;Letscher, Robert T.;Knapp, Angela N.
溶解有机磷（DOP）在海洋表层具有双重作用，既是初级生产的产物，也是促进初级生产和固氮的有机营养素，特别是在贫营养环流中。尽管限制条件较差，但表层海洋DOP浓度的地理分布和环境控制影响着全球海洋初级生产和固氮的分布和速率。在这里，我们配对DOP浓度测量与磷酸盐胁迫，卫星叶绿素a浓度和卫星铁胁迫代理的度量，以探讨它们与上50米DOP股票的关系。我们的研究结果表明，磷酸盐和铁应力共同作用，以控制表面海洋DOP浓度在流域尺度。具体而言，上50米DOP股票减少，增加磷酸盐应力，而缓解铁应力导致无论是表面DOP积累或损失取决于磷酸盐的可用性。我们的工作将DOP浓度和磷酸盐有效性之间的关系扩展到全球海洋，提出了海洋磷循环和铁有效性之间的联系，并建立了DOP分布及其作为支持全球海洋肥力的有机营养源的预测框架。表层海洋溶解有机磷的生产和消耗受磷酸盐和铁胁迫之间的相互作用控制，根据对海洋营养物分布的全球分析，
Dissolved organic phosphorus (DOP) has a dual role in the surface ocean as both a product of primary production and as an organic nutrient that fuels primary production and nitrogen fixation, especially in oligotrophic gyres. Although poorly constrained, the geographic distribution and environmental controls of surface ocean DOP concentrations influence the distributions and rates of primary production and nitrogen fixation in the global ocean. Here we pair DOP concentration measurements with a metric of phosphate stress, satellite-based chlorophyll a concentrations and a satellite-based iron stress proxy to explore their relationship with upper 50 m DOP stocks. Our results suggest that phosphate and iron stress work together to control surface ocean DOP concentrations at basin scales. Specifically, upper 50 m DOP stocks decrease with increasing phosphate stress, while alleviated iron stress leads to either surface DOP accumulation or loss depending on phosphate availability. Our work extends the relationship between DOP concentrations and phosphate availability to the global ocean, suggests a linkage between marine phosphorus cycling and iron availability and establishes a predictive framework for DOP distributions and their use as an organic nutrient source that supports global ocean fertility.Production and consumption of dissolved organic phosphorus in the surface ocean is controlled by the interplay between phosphate and iron stress, according to global analyses of the distribution of marine nutrients.