Where is mineral ballast important for surface export of particulate organic carbon in the ocean?
Where is mineral ballast important for surface export of particulate organic carbon in the ocean?
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DOI：
10.1002/2014gl061678
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发表时间：
2014-12-16
影响因子：
5.2
通讯作者：
Sanders, Richard J.
中科院分区：
文献类型：
--
作者：
Le Moigne, Frederic A. C.;Pabortsava, Katsiaryna;Marcinko, Charlotte L. J.;Martin, Patrick;Sanders, Richard J.
深海颗粒有机碳（POC）和矿物通量之间的相关性激发了碳循环模型中“压载效应”参数化的纳入。最近的一项研究表明，压载矿物对深海POC通量的影响存在区域差异。我们对来自北极、大西洋和南大洋的浅水输出数据进行了类似的分析。矿物压载在高纬度北大西洋是最重要的，其中60%的POC通量与压载矿物有关。这一比例在南大洋下降到40%左右。输出流量的其余部分与矿物无关，因此，这一未压载部分往往主导着输出流量。与矿物有关的POC通量的比例往往与出口效率（初级产品出口的比例）的区域差异成比例。然而，当地的差异表明，生态的区域差异也影响地表输出的大小。我们建议，POC出口将不会在所有高纬度地区的压载水供应的未来可能发生的变化作出同样的反应。
Correlations between particulate organic carbon (POC) and mineral fluxes in the deep ocean have inspired the inclusion of “ballast effect” parameterizations in carbon cycle models. A recent study demonstrated regional variability in the effect of ballast minerals on the flux of POC in the deep ocean. We have undertaken a similar analysis of shallow export data from the Arctic, Atlantic, and Southern Oceans. Mineral ballasting is of greatest importance in the high-latitude North Atlantic, where 60% of the POC flux is associated with ballast minerals. This fraction drops to around 40% in the Southern Ocean. The remainder of the export flux is not associated with minerals, and this unballasted fraction thus often dominates the export flux. The proportion of mineral-associated POC flux often scales with regional variation in export efficiency (the proportion of primary production that is exported). However, local discrepancies suggest that regional differences in ecology also impact the magnitude of surface export. We propose that POC export will not respond equally across all high-latitude regions to possible future changes in ballast availability.