Biogeochemical anatomy of a cyclonic warm-core eddy in the Arctic Ocean
Biogeochemical anatomy of a cyclonic warm-core eddy in the Arctic Ocean
复制标题
北冰洋气旋暖核涡旋的生物地球化学解剖
DOI：
10.1029/2018gl079659
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发表时间：
2018
影响因子：
5.2
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Nishino;S.;Kawaguchi;Y.;Fujiwara;A.;Shiozaki;T.;Aoyama;M.;Harada;N.;& Kikuchi;T.
在贫营养的北冰洋，以前的研究已经暗示了漩涡对浮游植物生物量的积极影响。然而，直接观测估计垂直营养盐通量的各个部分的涡旋仍然缺乏，这些可以解释的机制，高浮游植物生物量与涡旋相比，他们的环境。在这里，我们进行了电导率-温度-深度调查与水采样，以检查2015年夏末在楚科奇大陆架斜坡上发现的气旋性暖芯涡流的特征。此外，我们测量海洋微结构，以估计垂直营养盐通量和浮游植物的营养盐吸收的贡献。结果表明，营养物质从低层通过涡旋中心附近的垂直剪切混合和通过与涡旋边缘的交错结构相关的双扩散混合提供给真光层。浮游植物的大小结构之间的漩涡中心和边缘的显着差异。
In the oligotrophic Arctic Ocean, previous studies have implied positive impacts of eddies on phytoplankton biomass. However, direct observations for estimating vertical nutrient fluxes in various parts of eddies are still lacking; these could explain the mechanism of high phytoplankton biomass associated with eddies compared to their surroundings. Here we conducted conductivity‐temperature‐depth surveys with water sampling to examine the characteristics of a cyclonic warm‐core eddy found over the Chukchi shelf slope in late summer 2015. Furthermore, we measured ocean microstructures to estimate vertical nutrient fluxes and their contributions to nutrient uptake by phytoplankton. The results imply that nutrients were supplied to the euphotic zone from a lower layer through vertical shear mixing near the center of the eddy and through double‐diffusive mixing associated with an interleaving structure at the rim of the eddy. Phytoplankton size structures differed markedly between the center and rim of the eddy.