Marine dissolved organic phosphorus (DOP) serves as an organic nutrient to marine autotrophs, sustaining a portion of annual net community production (ANCP). Numerical models of ocean circulation and biogeochemistry have diagnosed the magnitude of this process at regional to global scales but have thus far been validated against DOP observations concentrated within the Atlantic basin. Here we assimilate a new marine DOP data set with global coverage to optimize an inverse model of the ocean phosphorus cycle to investigate the regionally variable role of marine DOP utilization by autotrophs contributing to ANCP. We find ∼25% of ANCP accumulates as DOP with a regionally variable pattern ranging from 8% to 50% across nine biomes investigated. Estimated mean surface ocean DOP lifetimes of ∼0.5–2 years allow for transport of DOP from regions of net production to net consumption in subtropical gyres. Globally, DOP utilization by autotrophs sustains ∼14% (0.9 Pg C yr⁻¹) of ANCP with regional contributions as large as ∼75% within the oligotrophic North Atlantic and North Pacific. Shallow export and remineralization of DOP within the ocean subtropics contributes ∼30%–80% of phosphate regeneration within the upper thermocline (<300 m). These shallow isopycnals beneath the subtropical gyres harboring the preponderance of remineralized DOP outcrop near the poleward edge of each gyre, which when combined with subsequent lateral transport equatorward by Ekman convergence, provide a shallow overturning loop retaining phosphorus within the subtropical biome, likely helping to sustain gyre ANCP over multiannual to decadal timescales.

中文翻译：

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溶解有机磷对海洋年度净社区生产的区域变量贡献

海洋溶解有机磷 (DOP) 作为海洋自养生物的有机营养物，维持部分年度净群落产量 (ANCP)。海洋环流和生物地球化学的数值模型已经诊断出这一过程在区域到全球范围内的规模，但迄今为止已经根据集中在大西洋盆地的 DOP 观测结果进行了验证。在这里，我们吸收了一个具有全球覆盖范围的新海洋 DOP 数据集，以优化海洋磷循环的逆模型，以研究自养生物对海洋 DOP 的利用对 ANCP 的区域变量作用。我们发现大约 25% 的 ANCP 以 DOP 的形式积累，在所调查的九个生物群落中具有从 8% 到 50% 不等的区域可变模式。估计平均表面海洋 DOP 寿命为 ∼0。5-2 年允许 DOP 从净生产区域输送到副热带环流中的净消耗区域。在全球范围内，自养生物对 DOP 的利用维持在 ~14%（0.9 Pg C yr⁻¹ ) 的 ANCP，在贫营养的北大西洋和北太平洋地区的区域贡献高达 ~75%。亚热带海洋中 DOP 的浅层输出和再矿化贡献了上层温跃层（<300 m）内约 30%–80% 的磷酸盐再生。亚热带环流下方的这些浅层等密度带在每个环流的极向边缘附近含有大量再矿化的 DOP 露头，当与随后由 Ekman 汇聚向赤道的横向输送相结合时，提供了一个浅层翻转环，将磷保留在亚热带生物群落内，可能有助于维持环流 ANCP 在多年到十年的时间尺度上。