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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Canfield ocean ： ウィキペディア英語版 Canfield ocean The Canfield Ocean model refers to the Ocean composition theorized by geologist Donald Canfield. In a seminal paper in ''Nature'' in 1998, Canfield argued that the Ocean had become partially anoxic and sulfidic during the Proterozoic. Peter Ward studies the effects of ocean hypoxia(anoxic) and sulfidic oceans and climate change. He found warming of the ocean caused by a rise of carbon dioxide levels to about 1000 parts per million as a trigger for mass extinction. The term ''Strangelove ocean'' is a model name coined by a study published in 1985, which found a decrease in the ''δ''13C values of planktic skeletons following the Cretaceous–Paleogene extinction event, causing a homogenous ocean in decades or centuries, visible in the boundary sediment layer as a manifestation of the elimination in the surface-to-bottom carbon isotope gradient in ocean waters, the halt of ocean primary production. During a time when carbon fractionation by a photosynthesis-respiration mechanism became ineffective. It was later shown that the burial rate of terrestrial organic carbon (biological pump) was likely unaffected. ==Definition== Euxinic Ocean conditions, a term describing restricted hydrologic circulation, leading to stagnant or anaerobic conditions, are the likely factor leading to sulfidic Oceans.〔 Euxinic describes anoxic conditions in the presence of hydrogen sulfide. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Canfield ocean」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.