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首页> 外文期刊>Paleoceanography >Reconstruction of paleo-particulate organic carbon fluxes for the Campbell Plateau region of southern New Zealand using the zinc content of sponge spicules
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Reconstruction of paleo-particulate organic carbon fluxes for the Campbell Plateau region of southern New Zealand using the zinc content of sponge spicules

机译：利用海绵针的锌含量重建新西兰南部坎贝尔高原地区的古颗粒有机碳通量

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[ 1] The zinc concentration of siliceous sponge spicules was determined from spicules recovered from four sediment cores spanning the last 160 kyr, from the Campbell Plateau region southeast of New Zealand. Zinc/Si results showed little difference between Holocene and glacial aged spicules. An increase in Zn/Si was observed for core Y14, where Zn/Si peaked at about 0.6 mu mol/mol during marine isotope stages 5a-5b. To better understand the role carbon export has on sponge Zn/Si, we explored the strong relationship observed between surficial sediment particulate organic carbon ( POC) and the Zn/Si of sponge silica and related this to sediment trap POC flux estimates. Conversion of the Zn/Si records to benthic POC fluxes suggests that there has been little change in the amount of POC reaching Campbell Plateau sediments over the past 30 kyr. These results suggest that surface productivity over the Campbell Plateau has remained relatively low over the past 160 kyr and suggests that glacial productivity was not significantly higher than the present day. Finally, this work reveals that living marine sponges appear to act as the biological equivalents of moored sediment traps, recording the flux of POC to the seafloor by archiving zinc associated with sinking POC in the growing silica skeleton.
机译：[1]硅质海绵针的锌浓度是根据从新西兰东南部坎贝尔高原地区的最后160年来跨越四个沉积岩心回收的针确定的。锌/硅的结果表明，全新世与冰川老化的针头之间几乎没有差异。对于芯Y14，观察到Zn / Si增加，其中在海洋同位素阶段5a-5b期间，Zn / Si在约0.6μmol/ mol的峰值处。为了更好地了解碳出口对海绵Zn / Si的作用，我们探索了表面沉积物颗粒有机碳（POC）与海绵二氧化硅的Zn / Si之间的密切关系，并将其与沉积物捕集阱POC通量估计值相关。将Zn / Si记录转换为底栖POC通量表明，在过去30年中，到达Campbell高原沉积物的POC量几乎没有变化。这些结果表明，在过去的160年里，坎贝尔高原的地表生产力一直相对较低，并且表明冰川生产力并未比今天高很多。最后，这项工作揭示了活海海绵似乎起到了系泊沉积物捕集阱的生物学等效作用，通过将与沉没的POC相关的锌存档在生长的二氧化硅骨架中，记录了POC向海底的通量。

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