Dissolved organic nitrogen cycling revealed at the molecular level in the Bohai and Yellow Sea

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

2 Scopus Citations
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Author(s)

  • Zhenwei Yan
  • Yu Xin
  • Xiaosong Zhong
  • Yuanbi Yi
  • Penghui Li
  • And 6 others
  • Yuntao Wang
  • Yuping Zhou
  • Youping Zhou
  • Chen He
  • Quan Shi
  • Ding He

Detail(s)

Original languageEnglish
Article number120446
Journal / PublicationWater Research
Volume244
Online published4 Aug 2023
Publication statusPublished - 1 Oct 2023
Externally publishedYes

Abstract

Marginal seas play a crucial role in the cycling of dissolved organic nitrogen (DON) between the terrestrial and marine environments. However, very few studies have considered the molecular transformation of DON in marginal seas, leaving the DON molecular modifications in its cycling largely unknown. Therefore, this study examined DON cycling in the Bohai Sea and Yellow Sea, two semi-closed marginal seas in northern China, using stable isotopes (δ15N and δ13C), optical characteristics, and molecular compositions. Compared to the Yellow Sea, the Bohai Sea had a weaker exchange with the open ocean, resulting in higher concentrations, lower δ15N, and more recalcitrant properties in DON. The DON cycling showed significant differences inside and outside the Yellow Sea Cold Water (YSCW). Degradation was the major sink of DON in the YSCW, during which more highly unsaturated compounds and carboxyl-rich alicyclic molecules were produced. Nitrogen atoms were found to be removed from the molecules with more N atoms to those with fewer ones during the DON degradation. This study discovered the molecular modifications in DON cycling and highlighted the intrinsic mechanisms in the cycling of DON in marginal seas. © 2023 Elsevier Ltd.

Research Area(s)

  • Dissolved organic nitrogen, Molecular composition, Nitrogen isotope, The bohai sea, The yellow sea

Citation Format(s)

Dissolved organic nitrogen cycling revealed at the molecular level in the Bohai and Yellow Sea. / Yan, Zhenwei; Xin, Yu; Zhong, Xiaosong et al.
In: Water Research, Vol. 244, 120446, 01.10.2023.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review