Regionally Variable Contribution of Dissolved Organic Phosphorus to Marine Annual Net Community Production
Regionally Variable Contribution of Dissolved Organic Phosphorus to Marine Annual Net Community Production
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DOI：
10.1029/2022gb007354
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发表时间：
2022-12-01
影响因子：
5.2
通讯作者：
Knapp, Angela N.
中科院分区：
文献类型：
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作者：
Letscher, Robert T.;Wang, Wei-Lei;Knapp, Angela N.
海洋溶解有机磷（DOP）作为海洋自养生物的有机营养物质，维持了一部分年净群落生产量（ANCP）。海洋环流和海洋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，已验证集中在大西洋盆地内的DOP观测。在这里，我们吸收了一个新的海洋DOP数据集与全球覆盖范围内优化海洋磷循环的逆模型，调查海洋DOP利用的区域变量的作用，由自养生物有助于ANCP。我们发现类似的25%的ANCP积累DOP的区域可变模式范围从8%到50%，在9个生物群落调查。估计海洋表层DOP的平均寿命约为0.5-2年，这使得DOP可以从亚热带环流的净生产区转移到净消费区。在全球范围内，自养生物对DOP的利用维持在ANCP的14%（0.9 Pg C yr（-1））左右，在贫营养的北大西洋和北太平洋，区域贡献高达75%。海洋副热带中DOP的浅层输出和再矿化贡献了上温跃层中磷酸盐再生的30%-80%（
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 similar to 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 similar to 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 similar to 14% (0.9 Pg C yr(-1)) of ANCP with regional contributions as large as similar to 75% within the oligotrophic North Atlantic and North Pacific. Shallow export and remineralization of DOP within the ocean subtropics contributes similar to 30%-80% of phosphate regeneration within the upper thermocline (