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• W4280491753 abstract "Dissolved organic nitrogen (DON) is an important component of the marine nitrogen (N) inventory and plays an essential role in N cycling in global estuaries and marginal seas. Understanding DON cycling is important but challenging. Global estuaries and marginal seas are experiencing significant anthropogenic impacts and have intensive physical/biochemical gradients. Therefore, high-quality DON concentration and N-isotope (δ 15 N–DON) data are very difficult to obtain. To enrich this knowledge, we take the Changjiang Estuary and the adjacent East China Sea shelf seas as a representative example and analyzed multiple isotopes and the concentrations of nitrate ( <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=im1><mml:mrow><mml:mtext>N</mml:mtext><mml:msubsup><mml:mtext>O</mml:mtext><mml:mn>3</mml:mn><mml:mo>−</mml:mo></mml:msubsup></mml:mrow></mml:math> ), particulate nitrogen (PN), and DON. N isotopes combined with optimum multiparameter analysis proved to be very informative. This integrated analysis discriminates active DON production and consumption from a seemingly conservative distribution pattern of DON. The study area was divided into DON production zones 1 and 2 (P-zone 1 and 2) and DON consumption zones 1 and 2 (C-zone 1 and 2). For P-zone 1, the PN-originated DON elevated the δ 15 N–DON, while in P-zone 2, the DON excreted by phytoplankton was characterized by low δ 15 N and lowered δ 15 N–DON. DON consumption occurred in the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=im2><mml:mrow><mml:mtext>N</mml:mtext><mml:msubsup><mml:mtext>O</mml:mtext><mml:mn>3</mml:mn><mml:mo>−</mml:mo></mml:msubsup></mml:mrow></mml:math> depleted surface waters (C-zone 1) as well as the shelf middle and bottom waters (C-zone 2). This study discovers and consolidates the active and dynamical zoning of DON cycling from the estuary to the offshore marginal sea and establishes a useful means that is of valuable reference to DON cycling studies in global estuaries and marginal seas." @default.
• W4280491753 created "2022-05-22" @default.
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• W4280491753 date "2022-05-10" @default.
• W4280491753 modified "2023-09-25" @default.
• W4280491753 title "Multiple Lenses of N-Isotopes Reveal Active Dissolved Organic Nitrogen Cycling in a Subtropical Estuary and Marginal Sea" @default.
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• W4280491753 doi "https://doi.org/10.3389/fmars.2022.855479" @default.
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