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- W2964788611 abstract "Abstract Marine nitrogen fixation contributes to the budget of biologically available N and thus fuels phytoplankton productivity and carbon cycle through biological pump. Modern N fixation rates are proved to be constrained by oceanographic condition and nutrient supply to the surface waters. However, the paleoceanographic reconstruction of N fixation and its regulation mechanism remain highly uncertain in many regions. Here we present records of N fixation changes in the South China Sea over the past 250,000 years reconstructed by compound‐specific nitrogen isotopes of individual amino acids. The δ 15 N of source amino acids (δ 15 N Src ), reflecting the δ 15 N of the substrate nitrate originating from the subsurface water, is distinctly lower during interglacial periods, indicating intensified N fixation during interglacials. The δ 15 N Src of the South China Sea covaries with the thermal gradient between surface and subsurface waters, implying a tight link between the upper water structure and N fixation. It could be hypothesized that stronger mixing during interglacials enhances the supply of excess phosphorous from the subsurface waters and thus encourages the growth of diazotrophs. Furthermore, records of bulk sediment δ 15 N with relatively high time resolution show dominant precession cycle, probably related to the nutrient supply from subsurface water driven by summer monsoon and associated upper water structure changes. Similar mechanism controlling N fixation is also effective in regions with enough iron supply and low concentrations of nitrogen and phosphorous, like the North Atlantic, supporting that upper water structure can dominate N fixation rates by regulating nutrient stoichiometry supplied to the surface waters." @default.
- W2964788611 created "2019-08-13" @default.
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- W2964788611 creator A5074706280 @default.
- W2964788611 date "2019-08-01" @default.
- W2964788611 modified "2023-10-16" @default.
- W2964788611 title "Nitrogen Fixation Changes Regulated by Upper Water Structure in the South China Sea During the Last Two Glacial Cycles" @default.
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- W2964788611 doi "https://doi.org/10.1029/2019gb006262" @default.
- W2964788611 hasPublicationYear "2019" @default.
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