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首页> 外文期刊>Journal of oceanography >Regeneration dynamics of iron and nutrients from bay sediment into bottom water of Funka Bay, Japan
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Regeneration dynamics of iron and nutrients from bay sediment into bottom water of Funka Bay, Japan

机译：日本丰卡湾海湾沉积物中铁和养分的再生动态

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We studied iron remobilization and nutrient regeneration in bottom water of Funka Bay, Japan, bimonthly from August 2010 to December 2011. The bay basin (bottom depth, 92–96?m) is separated from the northwest Pacific Ocean at its mouth by a sill with a depth of 60?m. After a spring phytoplankton bloom during early March–early April, nutrients in bay bottom water tended to accumulate with time until August–September, and to increase gradually with depth during April–October, by the oxidative decomposition of settling particulate organic matter on the bay bottom. In contrast, the process of iron remobilization into bottom water of the bay is remarkably different from nutrient regeneration. The much higher concentrations of dissolved and total dissolvable iron near the bottom and the seasonally variable relationship between dissolved iron concentration and apparent oxygen utilization in bay bottom water likely reflect a balance between dissolved iron input and removal processes within the bay bottom water. The release of soluble Fe(II) from reducing bay sediments might induce the high concentrations of dissolved and total dissolvable iron in deep–bottom waters of Funka Bay and might be one of the most important sources of iron in Funka Bay. The upward transport of iron from the bay bottom to the surface water during the winter vertical mixing may play an important role in the supply of bioavailable iron for phytoplankton growth in the coastal waters.
机译：我们研究了日本Funka湾从2010年8月至2011年12月每两个月进行一次铁迁移和养分再生的研究。海湾盆地（底部深度为92–96？m）与西北太平洋的一个门槛隔开。深度为60？m。在三月初至四月初春季浮游植物开花之后，海湾底水中的养分倾向于随着时间积累，直到八月至九月，然后在四月至十月之间随着深度的增加而逐渐增加，这是由于沉积在海湾上的颗粒有机物的氧化分解底部。相反，将铁迁移到海湾底水中的过程与养分再生显着不同。底部附近溶解和总可溶解铁的浓度高得多，海湾底部水中溶解铁的浓度与表观氧气利用率之间的季节性变化关系可能反映了海湾底部水中溶解铁的输入与清除过程之间的平衡。还原性海湾沉积物中释放的可溶性Fe（II）可能会在Funka湾深水中诱发高浓度的可溶解和全部可溶解铁，并且可能是Funka湾中最重要的铁源之一。在冬季垂直混合过程中，铁从海湾底部到地表水的向上运输可能在为沿海水域浮游植物生长提供生物利用铁方面发挥重要作用。

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