Modeling the Impact of Zooplankton Diel Vertical Migration on the Carbon Export Flux of the Biological Pump
Modeling the Impact of Zooplankton Diel Vertical Migration on the Carbon Export Flux of the Biological Pump
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DOI：
10.1029/2018gb005983
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发表时间：
2019-02-01
影响因子：
5.2
通讯作者：
Doney, Scott C.
中科院分区：
文献类型：
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作者：
Archibald, Kevin M.;Siegel, David A.;Doney, Scott C.
在许多输出模式中，生物泵的一个途径在很大程度上仍未量化，这就是浮游动物昼夜垂直迁移将碳从表层海洋主动输送到中层。在这里，我们开发了一个简单的表示浮游动物DVM和实现它在一个全球出口模型作为一个思想实验，以说明DVM对碳输出和中层海洋地球化学的影响。该模型是由诊断卫星测量净初级生产力，藻类生物量和浮游植物的大小结构。由于对可用卫星数据的限制，结果仅限于北纬60度至南纬60度的纬度范围。模拟的全球出口通量从底部的真光区为6.5 PgC/年，这代表了14%的增长，在没有DVM的模型运行的出口通量。在全球范围和气候季节周期内，DVM介导的输出通量对总碳输出的平均（+/-标准差，SD）比例贡献为0.16 +/- 0.04，DVM活动对黄昏区总呼吸的比例贡献为0.16 +/- 0.06。将DVM活性添加到模型中也导致氧利用曲线中的深局部最大值。模型结果是最敏感的假设参与DVM的个人的分数，在透光区产生的粪粒的分数，和放牧的碳代谢的分数。
One pathway of the biological pump that remains largely unquantified in many export models is the active transport of carbon from the surface ocean to the mesopelagic by zooplankton diel vertical migration (DVM). Here, we develop a simple representation of zooplankton DVM and implement it in a global export model as a thought experiment to illustrate the effects of DVM on carbon export and mesopelagic biogeochemistry. The model is driven by diagnostic satellite measurements of net primary production, algal biomass, and phytoplankton size structure. Due to constraints on available satellite data, the results are restricted to the latitude range from 60 degrees N to 60 degrees S. The modeled global export flux from the base of the euphotic zone was 6.5 PgC/year, which represents a 14% increase over the export flux in model runs without DVM. The mean (+/- standard deviation, SD) proportional contribution of the DVM-mediated export flux to total carbon export, averaged over the global domain and the climatological seasonal cycle, was 0.16 +/- 0.04 and the proportional contribution of DVM activity to total respiration within the twilight zone was 0.16 +/- 0.06. Adding DVM activity to the model also resulted in a deep local maximum in the oxygen utilization profile. The model results were most sensitive to the assumptions for the fraction of individuals participating in DVM, the fraction of fecal pellets produced in the euphotic zone, and the fraction of grazed carbon that is metabolized.