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海氷に含まれる鉄の生物利用能に関する研究
漢那, 直也;西岡, 純
Permalink : http://hdl.handle.net/2115/91802
JaLCDOI : 10.14943/lowtemsci.82.93
KEYWORDS : 海氷;微量金属;鉄;植物プランクトン;Sea ice;Trace metal;Iron;Phytoplankton
Abstract
地球温暖化により極域海洋の海氷が融け始め，海氷が関わる鉄の研究が注目されている．海氷の融解は，海洋で不足しやすい鉄の供給過程として重要であることがわかってきた．一方で，海氷中の鉄の生物利用能に関する研究は，取り組むべき課題として残されていた．そこで著者らは，現場観測や植物プランクトンの培養実験，粒子態鉄の溶解実験を行うことで，海氷中の鉄の生物利用能の解明に取り組んだ．培養実験により，植物プランクトンが海氷中の粒子態鉄を利用して増殖したことを実証した．また溶解実験により，海氷中の粒子態鉄の一部は，海水中へ溶出することが明らかになった．これらの成果は，植物プランクトンの春季ブルーム形成メカニズムの理解に貢献するものである．
Much research in recent years has focused on the iron in sea ice because extent of sea ice in the polar ocean is declining due to global warming. The melting of sea ice has been shown to be an important process for supplying iron to the oceans. To better understand the bioavailability of iron in sea ice, we performed field observations, phytoplankton incubation experiments, and dissolution experiments of particulate iron in sea ice. The incubation experiments demonstrated that phytoplankton grew by utilizing particle iron in sea ice. The dissolution experiments have revealed that some of the particle iron in sea ice can be leached into seawater. These results contribute to our understanding of the mechanism of phytoplankton bloom formation during the melting of sea ice.
Much research in recent years has focused on the iron in sea ice because extent of sea ice in the polar ocean is declining due to global warming. The melting of sea ice has been shown to be an important process for supplying iron to the oceans. To better understand the bioavailability of iron in sea ice, we performed field observations, phytoplankton incubation experiments, and dissolution experiments of particulate iron in sea ice. The incubation experiments demonstrated that phytoplankton grew by utilizing particle iron in sea ice. The dissolution experiments have revealed that some of the particle iron in sea ice can be leached into seawater. These results contribute to our understanding of the mechanism of phytoplankton bloom formation during the melting of sea ice.
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