Dissolved iodate and total iodine during an extreme hypoxic event in the southern Benguela system
Dissolved iodate and total iodine during an extreme hypoxic event in the southern Benguela system
复制标题
本格拉系统南部极端缺氧事件期间溶解的碘酸盐和总碘
DOI：
10.1006/ecss.2000.0609
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发表时间：
2000
影响因子：
2.8
通讯作者：
G. Bailey
中科院分区：
文献类型：
--
作者：
V. Truesdale;G. Bailey
摘要：本文研究了南非圣赫勒拿湾在科伦拜恩角上升流后急性缺氧期间的溶解碘酸盐和总碘含量。尽管叶绿素α的浓度普遍较高（10-30 mg m - 3），但海湾主要部分的总碘浓度基本上是恒定的，与海洋其他地方的浓度相似。在浅水中，偶尔发现总碘浓度较低（0.28 ~ 0.42 μM），叶绿素α浓度异常高（500 mg m−3）。相反，碘酸盐被发现在海湾的表面和底部都被还原成碘化物。鉴于地表水反映了持续的富营养化，而底部水由于来自上面水域的富有机物沉积物而缺氧，因此讨论了这些变化的含义。
Abstract Dissolved iodate and total iodine were studied in St Helena Bay, South Africa, during a period of acute hypoxia, following upwelling off Cape Columbine. Despite the generally high concentrations of chlorophyll α (10–30 mg m −3 ) total iodine concentration was essentially constant in the main part of the Bay, and similar to that found elsewhere in the oceans. Occasional, lower concentrations of total iodine (0·28 to 0·42 μM) were found with exceptionally high chlorophyll α concentrations (500 mg m −3 ) in shallow waters. In contrast, iodate was found to be reduced to iodide at both the surface and the bottom of the Bay. The implications of these changes are discussed, given that the surface waters reflect sustained eutrophication while the bottom waters are hypoxic as a result of the organic-rich sediment from the waters above.