Nitrate isotope distributions on the US GEOTRACES North Atlantic cross-basin section: Signals of polar nitrate sources and low latitude nitrogen cycling
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- 作者：Dario Marconia ; ; M. Alexandra Weiganda ; Patrick A. Raftera ; Matthew R. McIlvinb ; Matthew Forbesc ; Karen L. Casciottib ; c ; Daniel M. Sigmana
- 关键词：Nitrate isotopes ; Internal nitrogen cycle ; Nitrogen fixation ; Intermediate water
- 刊名：Marine Chemistry
- 出版年：2015
- 出版时间：20 December 2015
- 年：2015
- 卷：177
- 期：part_P1
- 页码：143-156
- 全文大小：2581 K
文摘
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Nitrate δ15N and δ18O profiles were measured across the North Atlantic.
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Partial assimilation in the Southern Ocean raises the δ15N of intermediate waters.
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Sinking N in the low latitudes lowers intermediate depth δ18O but not δ15N.
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Lowest δ15N in western thermocline does not require greater N fixation in west.
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δ15N difference between northward and southward flows as a measure of N fixation.