Modeling Iron and Light Controls on the Summer Phaeocystis antarctica Bloom in the Amundsen Sea Polynya
Modeling Iron and Light Controls on the Summer Phaeocystis antarctica Bloom in the Amundsen Sea Polynya
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模拟阿蒙森海冰间湖夏季南极棕囊藻盛开的铁和光控制
DOI：
10.1029/2018gb006168
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发表时间：
2019
影响因子：
5.2
通讯作者：
P. Yager
中科院分区：
文献类型：
--
作者：
H. Oliver;P. St‐Laurent;R. Sherrell;P. Yager
在所有南极沿海冰穴中，阿蒙森海冰穴是单位面积产量最高的。2010-2011年阿蒙森海Polynya国际研究考察队（ASPIRE）的观察显示，光和铁都可以限制浮游植物（Phaeocystis anaerotica）的生长，但这些控制在水华季节的表现方式却知之甚少，特别是关于它们的气候敏感性。利用一维海洋地球化学模型，我们研究了光和铁限制对浮游植物水华和垂直碳通量的影响，在12个站代表不同的水华阶段内的冰藻。模型参数由ASPIRE观测的贝叶斯优化和同化确定。模型-数据拟合对浮游植物生理参数最敏感，在所有模型参数中，浮游植物生理参数最受优化约束。我们发现，1-D模型捕捉到的基本元素，在ASPIRE期间观察到的水华，尽管模拟和观察到的溶解铁分布之间存在一些差异。利用这个模型，我们探索了铁的可用性，结合光的可用性，控制的上升，高峰和下降的水华在12个站。通过自遮蔽模拟的光限制非常强，但是随着开花的增加，铁被拉下，随着开花的减少，与光结合成为限制。这些模型结果从机制上证实了气候敏感性控制（如分层和融水）对该地区浮游植物水华发展和碳输出的重要性。
Of all the Antarctic coastal polynyas, the Amundsen Sea Polynya is the most productive per unit area. Observations from the 2010–2011 Amundsen Sea Polynya International Research Expedition (ASPIRE) revealed that both light and iron can limit the growth of phytoplankton (Phaeocystis antarctica), but how these controls manifest over the bloom season is poorly understood, especially with respect to their climate sensitivity. Using a 1‐D biogeochemical model, we examine the influence of light and iron limitation on the phytoplankton bloom and vertical carbon flux at 12 stations representing different bloom stages within the polynya. Model parameters are determined by Bayesian optimization and assimilation of ASPIRE observations. The model‐data fit is most sensitive to phytoplankton physiological parameters, which among all model parameters are best constrained by the optimization. We find that the 1‐D model captures the basic elements of the bloom observed during ASPIRE, despite some discrepancies between modeled and observed dissolved iron distributions. With this model, we explore the way iron availability, in combination with light availability, controlled the rise, peak, and decline of the bloom at the 12 stations. Modeled light limitation by self‐shading is very strong, but iron is drawn down as the bloom rises, becoming limiting in combination with light as the bloom declines. These model results mechanistically confirm the importance of climate‐sensitive controls like stratification and meltwater on phytoplankton bloom development and carbon export in this region.
影响因子：
5.2
作者：
Tagliabue, Alessandro;Aumont, Olivier;Yool, Andrew
通讯作者：
Yool, Andrew
受多种放射性核素约束的北大西洋颗粒元素通量
影响因子：
5.2
作者：
Hayes, Christopher T.;Black, Erin E.;Anderson, Robert F.;Baskaran, Mark;Buesseler, Ken O.;Charette, Matthew A.;Cheng, Hai;Cochran, J. Kirk;Edwards, R. Lawrence;Fitzgerald, Patrick
通讯作者：
Fitzgerald, Patrick