Regeneration dynamics of iron and nutrients from bay sediment into bottom water of Funka Bay, Japan
Regeneration dynamics of iron and nutrients from bay sediment into bottom water of Funka Bay, Japan
复制标题
日本芬卡湾海湾沉积物中铁和营养物质到底层水的再生动态
DOI：
10.1007/s10872-015-0312-6
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Y. Kamei
中科院分区：
文献类型：
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作者：
N. Hioki;K. Kuma;Y. Morita;D. Miura;A. Ooki;S. Tanaka;H. Onishi;T. Takatsu;N. Kobayashi;Y. Kamei
本研究于2010年8月至2011年12月，每两个月对日本丰卡湾底水铁的再活化和养分再生进行研究。海湾盆地（底部深度92-96米）与西北太平洋在河口处被一个深度60米的海槛隔开。在3月初至4月初的春季浮游植物繁殖之后，海湾底水的营养物质随着时间的推移趋于积累，直到8月至9月，并在4月至10月期间随着深度的增加而逐渐增加，主要是通过沉淀在海湾底的颗粒物有机物的氧化分解。相反，海湾底水的铁再动员过程与营养物再生过程有显著不同。靠近底部的溶解铁和总溶解铁浓度高得多，以及海湾底水中溶解铁浓度与表观氧利用之间的季节性变化关系可能反映了海湾底水中溶解铁输入和去除过程之间的平衡。还原性海湾沉积物释放的可溶性铁（II）可能导致丰卡湾深底水体中存在高浓度的可溶性铁和总可溶性铁，可能是丰卡湾最重要的铁来源之一。在冬季垂直混合过程中，铁从海湾底部向上运输到地表水，可能对沿海水域浮游植物生长所需的生物可利用铁的供应起重要作用。
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.