Deciphering and quantifying nitrate sources and processes in the central Yellow Sea using dual isotopes of nitrate,Water Research

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Deciphering and quantifying nitrate sources and processes in the central Yellow Sea using dual isotopes of nitrate
Water Research ( IF 11.4 ) Pub Date : 2024-06-24 , DOI: 10.1016/j.watres.2024.121995
Xiaosong Zhong ₁ , Xiangbin Ran ₂

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Anthropogenic activities pose significant challenges to the accumulation of coastal nitrogen (N). Accurate identification of nitrate (NO) sources is thus essential for mitigating excessive N in many marginal seas. We investigated the dual isotopes of NO in the central Yellow Sea to elucidate the sources and cycling processes of NO. The results revealed significant spatial variability in NO concentrations among the Yellow Sea Surface Water (YSSW), Changjiang Diluted Water (CDW), Yellow Sea Cold Water Mass (YSCWM), and Taiwan Warm Current Water (TWCW). Stratification played a crucial role in restricting vertical nutrient transport, leading to distinct nutrient sources and concentrations in different water masses. The dual NO isotopic signature indicated that atmospheric deposition was the primary source of surface NO, contributing approximately 30 % to the NO in the YSSW. In the NO-rich CDW, the heavier δN-NO and δO-NO suggested incomplete NO assimilation. Organic matter mineralization and water stratification played crucial roles in the accumulation of nutrients within the YSCWM and TWCW. Notably, regenerated NO accounted for approximately half of the NO stored in the YSCWM. A synthesis of NO dual isotope data across the coastal China seas revealed significant spatial and seasonal variations in the N source. The study emphasized the dynamics of coastal NO supply, which are shaped by the complex interconnections among marine, terrestrial, and atmospheric processes. Our approach is a feasible method for exploring the origins of N amidst the escalating pressures of anthropogenic nutrient pollution in coastal waters.

更新日期：2024-06-24

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