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首页> 外文期刊>Journal of oceanography >Processes influencing iron distribution in the coastal waters of the Tsugaru Strait, Japan
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Processes influencing iron distribution in the coastal waters of the Tsugaru Strait, Japan

机译：影响日本津轻海峡沿海水域铁分布的过程

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We report measurements of iron, nutrients, dissolved oxygen, humic-type fluorescence intensity and chlorophyll a concentrations in the coastal waters at the inflow (western) and outflow (eastern) ends of Tsugaru Strait (Japan) in June 2003 and 2004. Two different water masses (intensive eastward flow “subtropical Tsugaru Warm Current Water (TWCw)” and weak westward flow “subarctic Oyashio Water (OW)”) were observed at the eastern end of the strait. TWCw at the southern part of the eastern strait was vertically homogeneous with a uniform concentrations of iron (0.7–1.1 nM for labile dissolved Fe and 14–20 nM for total dissolvable Fe in 2003) as well as other chemical, biological and physical components throughout the water column of 200 m due to strong vertical mixing in the strait. The degree of mixing in the Tsugaru Warm Current (TWC) is predominantly affected by diurnal tidal current, which is strong during the period of tropical tides and weak during the period of equinoctial ones. The especially strong vertical water mixing in 2003 is caused by large dissipation energy input due to the bottom friction of passage-flow through the strait and tidal current. At the northern part of the eastern strait, the fresh surface layer overlying the OW and the deep-bottom waters in 2003 contained large concentrations of dissolved iron, resulting from iron supplied from river runoff and shelf sediments, respectively. These results suggest that the most important mechanism for transporting iron in the strait is the strong vertical water mixing due to the tidal current, and that the iron sources in the coastal waters are the organic-associated, iron-rich freshwater input into the surface water.
机译：我们报告了2003年6月和2004年津轻海峡（日本）流入（西部）和流出（东部）末端沿海水域中铁，养分，溶解氧，腐殖质型荧光强度和叶绿素a浓度的测量值。两种不同在海峡的东端观察到大量水（密集的向东流“亚热带津轻暖流水（TWCw）”和向西的弱流“南亚矢潮水（OW）”）。东海峡南部的TWCw在垂直方向上是均质的，铁的浓度均匀（2003年不稳定溶解的铁为0.7–1.1 nM，可溶性总铁为14–20 nM）以及贯穿整个过程的其他化学，生物和物理成分由于海峡强烈的垂直混合，水柱达到200 m。津轻暖流（TWC）的混合程度主要受昼夜潮流的影响，昼间潮流在热带潮汐时期强烈，而在等潮时期则弱。 2003年垂直水混合特别强烈是由于海峡两岸通道水流的底部摩擦力和潮汐流输入了大量的耗散能量。在海峡北部，2003年覆盖OW和深水的新鲜表层含有大量溶解的铁，分别来自河流径流和架子沉积物提供的铁。这些结果表明，在海峡运输铁的最重要机制是由于潮流导致的强烈垂直水混合，并且沿海水域中的铁源是有机结合的，富含铁的淡水输入地表水。 。

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