摘要：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

ISSN号：0043-1354

卷、期、页：卷244

发表日期：2023-10-01

影响因子：0.000000

期刊分区（SCI为中科院分区）：一区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Water Research

参与作者：严振伟,辛宇,钟晓松,易沅壁,李朋辉,王云涛,周玉萍,周友平,何丁

第一作者：何晨,史权

论文类型：期刊论文

论文概要：严振伟,辛宇,钟晓松,易沅壁,李朋辉,王云涛,周玉萍,周友平,何晨,史权,何丁，Dissolved organic nitrogen cycling revealed at the molecular level in the Bohai and Yellow Sea，Water Research，2023，卷244

论文题目：Dissolved organic nitrogen cycling revealed at the molecular level in the Bohai and Yellow Sea