Dissolved inorganic radiocarbon in the North Pacific Ocean and Sargasso Sea

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• 作者：Ellen R.M. Druffel ; James E. Bauer ; Sheila Griffin ; Steven R. Beaupré ; Jeomshik Hwang
• 关键词：Dissolved inorganic carbon ; Radiocarbon ; Bomb radiocarbon ; Deep circulation
• 刊名：Deep Sea Research Part I ; Oceanographic Research Papers
• 出版年：2008
• 期刊代码：33_09670637
• 类别：abs
• 出版时间：April 2008
• 卷：55
• 期：4
• 页码：451-459
• 文件大小：359 K

摘要

We present radiocarbon measurements of dissolved inorganic carbon (DIC) in depth profiles from reoccupations of our central North Pacific Ocean and Sargasso Sea (SS) sites. From 1985 to 1999, an increase in Δ¹⁴C values of 6–17‰ was measured between 1150 and 2400 m depth in the North Central Pacific. Natural changes in deep circulation are likely responsible for variability of Δ¹⁴C signatures in the deep ocean, though we cannot rule out the presence of bomb ¹⁴C at this depth range. Bomb ¹⁴C had increased in the deep SS from 1989 to 2000; this is the result of southward transport of North Atlantic Deep Water (NADW) to this site.