The Southern Ocean is the largest region in which iron limits the growth of phytoplankton. However, a phytoplankton bloom thousands of square kilometers in area forms each spring–summer in the Indian sector of the Southern Ocean, both above and to the east of the Kerguelen Plateau. The central region of the Kerguelen Plateau hosts the volcanically active islands, Heard and McDonald (HIMI), the former of which is largely covered by glaciers. The sources and processes governing supply of iron from HIMI to the region are relatively unknown. In the austral summer of 2016, the first voyage to focus on biogeochemical cycling in the HIMI region was undertaken (GEOTRACES process study GIpr05). Using dissolved iron (II) (DFe (II)) and hydrogen peroxide (H₂O₂) measurements, we are able to resolve iron sources and show that each of the adjacent islands are strong sources of reduced iron, though controlled by different supply mechanisms.

中文翻译：

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希尔德和麦当劳群岛周围的南部海洋水域中的溶解铁（II）的冰河和热液源

南大洋是铁限制浮游植物生长的最大区域。但是，每年春季至夏季，南至北印度洋南部的克格伦高原上方和东部，都会浮游植物盛开数千平方公里的区域。克格伦高原的中部地区有火山活动岛，希德和麦当劳（HIMI），前者大部分被冰川覆盖。从HIMI向该地区供应铁的来源和过程相对未知。2016年的南方夏季，首次进行了以HIMI地区为重点的生物地球化学循环的航行（GEOTRACES过程研究GIpr05）。使用溶解的铁（II）（DFe（II））和过氧化氢（H ₂ O ₂）测量，我们能够解析铁的来源，并表明，尽管受不同的供应机制控制，但每个相邻的岛都是还原铁的有力来源。