Combined constraints on global ocean primary production using observations and models
Combined constraints on global ocean primary production using observations and models
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DOI：
10.1002/gbc.20074
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发表时间：
2013-09-01
影响因子：
5.2
通讯作者：
Le Quere, Corinne
中科院分区：
文献类型：
--
作者：
Buitenhuis, Erik T.;Hashioka, Taketo;Le Quere, Corinne
初级生产是海洋食物网的基础，在全球生物地球化学循环中发挥着核心作用。然而，全球海洋初级生产力只有一个近似于2的系数，以前的估计值从38到65 PgCyr（-1）不等，没有正式的不确定性分析。在这里，我们提出了一个改进的全球海洋生态地球化学模型，包括光合作用的机械表示和一个新的观测数据库的净初级生产力（NPP）在海洋中。我们结合联合收割机的模式和观测，以限制在海洋中的颗粒NPP与统计指标。PlankTOM 5.3模型包括一个新的光合作用制剂与铁光colimitation的动态表示，这导致了相当大的改善表面叶绿素的年际变化。该数据库包括一组一致的50,050个C-14初级生产测量值。当全球NPP为587 PgCyr（-1）时，模型最好地再现观测结果，最可能值为56 PgCyr（-1）。最可能值对所用模型具有稳健性。不确定度代表95%置信区间。它考虑模型和观测值中的所有随机误差，但不考虑观测值中的潜在偏差。我们发现，热带地区（23 ° S-23 ° N）贡献了全球NPP的一半，而NPP在北方和南半球是大致相等的，尽管在南方的海洋面积较大。
Primary production is at the base of the marine food web and plays a central role for global biogeochemical cycles. Yet global ocean primary production is known to only a factor of similar to 2, with previous estimates ranging from 38 to 65PgCyr(-1) and no formal uncertainty analysis. Here, we present an improved global ocean biogeochemistry model that includes a mechanistic representation of photosynthesis and a new observational database of net primary production (NPP) in the ocean. We combine the model and observations to constrain particulate NPP in the ocean with statistical metrics. The PlankTOM5.3 model includes a new photosynthesis formulation with a dynamic representation of iron-light colimitation, which leads to a considerable improvement of the interannual variability of surface chlorophyll. The database includes a consistent set of 50,050 measurements of C-14 primary production. The model best reproduces observations when global NPP is 587PgCyr(-1), with a most probable value of 56PgCyr(-1). The most probable value is robust to the model used. The uncertainty represents 95% confidence intervals. It considers all random errors in the model and observations, but not potential biases in the observations. We show that tropical regions (23 degrees S-23 degrees N) contribute half of the global NPP, while NPPs in the Northern and Southern Hemispheres are approximately equal in spite of the larger ocean area in the South.