Effects of African dust deposition on phytoplankton in the western tropical Atlantic Ocean off Barbados
Effects of African dust deposition on phytoplankton in the western tropical Atlantic Ocean off Barbados
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DOI：
10.1002/2015gb005334
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发表时间：
2016-05-01
影响因子：
5.2
通讯作者：
Paytan, Adina
中科院分区：
文献类型：
--
作者：
Chien, Chia-Te;Mackey, Katherine R. M.;Paytan, Adina
利用营养物和当地大气气溶胶修正物进行的生物测定培养实验表明，在巴巴多斯附近低营养低叶绿素（LNLC）海洋中，磷(P)的有效性限制了浮游植物的生长。与其他营养源相比，大气沉积为该地区表层海洋提供了相对较大的新营养物和微量金属流入。然而，由于氮(N)与磷（NO3:SRP）的高比率（NO3:SRP bbb40）和这些气溶胶的低P溶解度，对本地浮游植物的影响不大。大气沉降通过相对于P增加更多的N和铁（Fe），导致LNLC区域的P限制，这有利于原绿球藻的生长，这是一个以低磷需求和高效磷获取机制为特征的属。一个包含特定种类浮游植物元素配额/化学计量和大气氮、磷、铁沉积的全球三维海洋生态系统模型支持这一结论。因此，未来气溶胶氮负荷的增加可能会影响其他LNLC地区的浮游植物群落结构，从而影响生物泵和相关的碳固存。
Bioassay incubation experiments conducted with nutrients and local atmospheric aerosol amendments indicate that phosphorus (P) availability limited phytoplankton growth in the low-nutrient low-chlorophyll (LNLC) ocean off Barbados. Atmospheric deposition provides a relatively large influx of new nutrients and trace metals to the surface ocean in this region in comparison to other nutrient sources. However, the impact on native phytoplankton is muted due to the high ratio of nitrogen (N) to P (NO3:SRP>40) and the low P solubility of these aerosols. Atmospheric deposition induces P limitation in this LNLC region by adding more N and iron (Fe) relative to P. This favors the growth of Prochlorococcus, a genus characterized by low P requirements and highly efficient P acquisition mechanisms. A global three-dimensional marine ecosystem model that includes species-specific phytoplankton elemental quotas/stoichiometry and the atmospheric deposition of N, P, and Fe supports this conclusion. Future increases in aerosol N loading may therefore influence phytoplankton community structure in other LNLC areas, thereby affecting the biological pump and associated carbon sequestration.