A substantial export flux of particulate organic carbon linked to sinking dead copepods during winter 2007–2008 in the Amundsen Gulf (southeastern Beaufort Sea, Arctic Ocean)
A substantial export flux of particulate organic carbon linked to sinking dead copepods during winter 2007–2008 in the Amundsen Gulf (southeastern Beaufort Sea, Arctic Ocean)
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DOI：
10.4319/lo.2012.57.1.0090
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发表时间：
2012-01
影响因子：
4.5
通讯作者：
M. Sampei;H. Sasaki;A. Forest;L. Fortier
中科院分区：
文献类型：
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作者：
M. Sampei;H. Sasaki;A. Forest;L. Fortier
在北冰洋，颗粒有机碳 (POC) 的垂直通量在黑暗的冬季仍然很低，因为 POC 通量来自光合作用生产。被动下沉的死亡桡足类传统上被排除在使用沉积物捕集器估计的 POC 通量之外，导致总 POC 通量被低估。在这里，我们展示了 2007 年 10 月至 2008 年 7 月期间，通过停泊在阿蒙森湾（波弗特海东南部）约 100 m 处的沉积物捕集器测得的总 POC 输出通量的季节性变化。令人惊讶的是，2 月份的综合总 POC 通量（466 mg m−2）是研究期间第二高的通量（最高的是 7 月；1015 mg C m−2），这是由于91%来自沉没的桡足类动物。 2008 年 2 月，阿蒙森湾的总 POC 通量比之前报道的传统 POC 冬季通量高出两个数量级，其中不包括下沉死亡桡足类的贡献。因此，2月份的POC通量只能相当于准年度传统POC通量的~18%。我们的观察表明，由于浮游动物的生命周期，2007-2008 年冬季出现了大量的 POC 出口通量。
In the Arctic Ocean, vertical fluxes of particulate organic carbon (POC) remain low during the dark winter period because POC fluxes are derived from photosynthetic production. Passively sinking dead copepods are traditionally excluded from POC fluxes estimated using sediment traps, resulting in the underestimation of the total POC flux. Here, we present the seasonal variability of total POC export flux measured by a sediment trap moored at ∼ 100 m in the Amundsen Gulf (southeastern Beaufort Sea) over October 2007‐July 2008. Surprisingly, the integrated total POC flux for February (466 mg m−2) was the second highest flux during the study period (the highest was in Jul; 1015 mg C m−2) due to a contribution of 91% from sinking dead copepods. The total POC flux in February 2008 in the Amundsen Gulf was up to two orders of magnitude higher than the previously reported traditional POC winter fluxes that did not include the contribution of sinking dead copepods. Hence, the POC flux in February only could be equivalent to ∼ 18% of the quasi‐annual traditional POC flux. Our observations suggest that a substantial POC export flux occurred during winter 2007–2008 due to zooplankton life cycle.