Attenuation of particulate organic carbon flux in the Scotia Sea, Southern Ocean, is controlled by zooplankton fecal pellets
Attenuation of particulate organic carbon flux in the Scotia Sea, Southern Ocean, is controlled by zooplankton fecal pellets
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DOI：
10.1002/2014gl062744
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发表时间：
2015-02-16
影响因子：
5.2
通讯作者：
Sanders, R. J.
中科院分区：
文献类型：
--
作者：
Cavan, E. L.;Le Moigne, F. A. C.;Sanders, R. J.
南大洋是一个重要的CO2储集层，部分CO2通过有机质的生产、下沉和再矿化作用进入。最近的研究表明，下沉的产量比例与SO的产量成反比，我们从Scotia海的20个站点证实了这一建议。据信，在高纬度系统中，出口物质向深处转移的效率（转移效率）较低。然而，我们对传输效率的估计是双峰的，季节性冰带的站点显示出强烈的损失，而其他站点显示出通量随着深度的增加。浮游动物粪便颗粒在有机碳通量中占主导地位，在转运效率>100%的站点，粪便颗粒呈棕色，表明植物碎屑是新鲜的。我们认为，浮游动物垂直迁移和海冰的存在介导的活跃通量调节了南大洋有机碳向海洋内部的转移。
The Southern Ocean (SO) is an important CO2 reservoir, some of which enters via the production, sinking, and remineralization of organic matter. Recent work suggests that the fraction of production that sinks is inversely related to production in the SO, a suggestion that we confirm from 20 stations in the Scotia Sea. The efficiency with which exported material is transferred to depth (transfer efficiency) is believed to be low in high-latitude systems. However, our estimates of transfer efficiency are bimodal, with stations in the seasonal ice zone showing intense losses and others displaying increases in flux with depth. Zooplankton fecal pellets dominated the organic carbon flux and at stations with transfer efficiency >100% fecal pellets were brown, indicative of fresh phytodetritus. We suggest that active flux mediated by zooplankton vertical migration and the presence of sea ice regulates the transfer of organic carbon into the oceans interior in the Southern Ocean.