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首页> 外文期刊>Oceanographic Literature Review >Source Versus Recycling Influences on the Isotopic Composition of Nitrate and Nitrite in the East China Sea
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Source Versus Recycling Influences on the Isotopic Composition of Nitrate and Nitrite in the East China Sea

机译：对东海硝酸盐同位素组成的来源与回收影响

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摘要

Nitrogen transfer processes and NOj sources in the East China Sea (ECS) were analyzed using dual isotopes of NO_3~- and NO_2~-, the concentration and isotopes of dissolved O_2and N_2 gases, nutrient concentrations, and the hydrological conditions. It was clear that the δ~(15)N and δ~(18)O values of NO_3~- in the Changjiang freshwater were 5.6-6.6‰ and 0.6-1.0‰, respectively, affected by human activities (fertilizer, sewage, and manure) and nitrification. Off the Changjiang Estuary to the ECS continental slope, the NO~3~- concentration was lower or exhausted in the upper water layers, where both available δ~(15)N and δ~(18)O values for NO_3~- were high related to phytoplankton assimilation. In the lower water layers, organic matter remineralization, nitrification, and coupled sedimentary nitrification and denitrification resulted in low NO_3~-isotope values. Moreover, in the upper water layers of the ECS continental slope, NO_3~- showed high δ~(15)N and δ~(18)O values and low A(15, 18) values affected by assimilation, nitrification, and N_2 fixation. NO_2~- in the ECS was dominated by NH_4~+ oxidation, and NO_2 oxidation plays an important role in depleting NO_2~-in δ~(15)N values. An overall NO_3~- budget is built for the ECS shelf, indicating that open boundary exchanges of NO_3~- flux and isotopes through Kuroshio invasion and Taiwan Warm Current Water are comparable to outflow off the ECS shelf, and nitrogen transformation processes (such as NO_3~- assimilation and nitrification) play an important role in nitrogen cycle, and NO_3~- is modified on the ECS shelf.
机译：通过NO_3〜2〜2 - ，溶解O_2和N_2气体，营养浓度和水文条件的双同位素分析了东海（ECS）中的氮传递过程和NOJ来源。显然，在长江淡水中NO_3〜 - - 在长江淡水中的δ〜（15）n和δ〜（18）o值分别受人类活动的影响5.6-6.6‰和0.6-1.0‰（肥料，污水和粪便）和硝化。关闭长江口到ECS欧式坡，上水层中不〜3〜浓度较低或耗尽，其中可用δ〜（15）n和δ〜（18）o值为no_3〜 - 很高与Phytoplankton同化有关。在较低的水层中，有机物再矿化，硝化和偶联沉积硝化和脱氮导致低NO_3〜离子络物值。此外，在ECS大陆斜坡的上水层中，NO_3〜 - 显示高δ〜（15）n和δ〜（18）o值，其受同化，硝化和n_2固定影响的低A（15,18）值。 NO_2〜 - 在EC中由NH_4〜+氧化占主导，NO_2氧化在耗尽NO_2〜-INΔ〜（15）n值中起重要作用。整体NO_3〜 - 预算是为ECS架构建的，表明NO_3〜 - 通量和同位素通过KUROSHIO入侵和台湾暖水水的开放边界交换与ECS架子的流出和氮转换过程（如NO_3）相当〜 - 同化和硝化）在氮循环中起重要作用，并且在ECS架上修改了NO_3〜 -

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    《Oceanographic Literature Review》 |2020年第10期|2134-2134|共1页
  • 作者

    S.M. Liu; X. Ning; S. Dong;

  • 作者单位

    Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and Technology Qingdao China;

    Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and Technology Qingdao China;

    Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and Technology Qingdao China;

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