Shifts in regional production as a driver of future global ocean production stoichiometry
Shifts in regional production as a driver of future global ocean production stoichiometry
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区域生产的转变是未来全球海洋生产化学计量的驱动力
DOI：
10.1088/1748-9326/abc4b0
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发表时间：
2020
影响因子：
6.7
通讯作者：
Tanioka, Tatsuro
中科院分区：
文献类型：
--
作者：
Matsumoto, Katsumi;Tanioka, Tatsuro
利用全球海洋生物地球化学模型，研究了全球海洋产量C: N: P比值的三个驱动因素：弹性浮游植物化学计量学、浮游植物群落组成和区域生产转移。对于中等变暖情景（SSP2），该模型预测，到2100年，全球出口C: P比率将从113:1大幅增加到119:1。这种化学计量学变化最重要的生理驱动因素是全球变暖对蓝藻的影响，其次是磷酸盐耗竭对南大洋真核生物的影响。此外，在全球范围内，浮游植物群落以牺牲真核生物为代价，有利于蓝藻，对全球生产化学计量的影响最小。我们发现，即使在浮游植物化学计量或分类没有任何变化的情况下，区域生产的变化也会改变全球生产的C: N: P比率。例如，在通常具有低碳：氮：磷比率的极地水域，提高产量将具有降低全球比率的效果。在我们的模型中，南极海冰的退缩具有这种影响，但被下游和其他地方的产量变化所抵消。因此，本研究提供了对区域生产变化如何影响全球生产C: N: P比率的理解。然而，目前的文献表明，区域生产变化的未来预测存在很大的不确定性，因此目前尚不清楚它们对全球生产C: N: P比率的净影响。最后，我们的模型预测，灵活的C: N: P比率导致的有机质碳含量的总体增加有助于在养分输出减少的情况下稳定碳输出（即到2100年，碳输出的减少比磷输出减少的预期减少约30%），但对大气co2吸收的影响最小（约1%）。
Using a global ocean biogeochemistry model, we examined three drivers of global ocean production C: N: P ratio: flexible phytoplankton stoichiometry, phytoplankton community composition, and regional production shifts. For a middle-of-the-road warming scenario (SSP2), the model predicts a substantial increase in the global export C: P ratio from 113: 1 to 119: 1 by the year 2100. The most important physiological driver of this stoichiometric change is the effect of the worldwide warming on cyanobacteria, followed by the effect of phosphate depletion on eukaryotes in the Southern Ocean. Also, there is a modest global shift in the phytoplankton community in favor of cyanobacteria at the expense of eukaryotes with a minimal effect on the global production stoichiometry. We find that shifts in the regional production, even in the absence of any change in phytoplankton stoichiometry or taxonomy, can change the global production C: N: P ratio. For example, enhancing the production in the polar waters, which typically have low C: N: P ratios, will have the effect of lowering the global ratio. In our model, the retreat of Antarctic sea ice has this very effect but is offset by production changes downstream and elsewhere. This study thus provides an understanding of how regional production changes can affect the global production C: N: P ratio. However, the current literature indicates substantial uncertainty in the future projections of regional production changes, so it is unclear at this time what their net effect is on the global production C: N: P ratio. Finally, our model predicts that the overall increase in the carbon content of organic matter due to flexible C: N: P ratio helps to stabilize carbon export in the face of reduced nutrient export (ie the decrease in C export is~ 30% smaller than expected from the decrease in P export by 2100) but has a minimal effect on atmospheric CO 2 uptake (~ 1%).
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影响因子：
4.9
作者：
Cao, L.;Eby, M.;Yool, A.
通讯作者：
Yool, A.
影响因子：
5.2
作者：
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通讯作者：
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影响因子：
3.5
作者：
Matsumoto, Katsumi;Rickaby, Rosalind;Tanioka, Tatsuro
通讯作者：
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影响因子：
4.9
作者：
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通讯作者：
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影响因子：
4.3
作者：
Eby, M.;Weaver, A. J.;Zhao, F.
通讯作者：
Zhao, F.