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

Yan，Zhenwei1,2; Xin，Yu2; Zhong，Xiaosong2,11; Yi，Yuanbi1; Li，Penghui3,6,10; Wang，Yuntao4; Zhou，Yuping7; Zhou，Youping8; He，Chen5; Shi，Quan5; He，Ding1,4,9

2023-10-01

10.1016/j.watres.2023.120446

Water Research   Impact Factor & Quartile

0043-1354

1879-2448

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 (δN and δC), 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 δN, 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.

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

SCI

English

NI Journal Papers

Others

National Key Research and Development Program of China[2018YFC0309803];National Science Foundation[41576082];National Natural Science Foundation of China[41649901];National Science Foundation[42222061];

Engineering ; Environmental Sciences & Ecology ; Water Resources

Engineering, Environmental ; Environmental Sciences ; Water Resources

WOS:001069786000001

PERGAMON-ELSEVIER SCIENCE LTD

ENVIRONMENT/ECOLOGY

2-s2.0-85167604692

Scopus

1.Department of Ocean Science and Center for Ocean Research in Hong Kong and Macau,The Hong Kong University of Science and Technology,Clear Water Bay,Hong Kong,China
2.Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Institute for Advanced Ocean Study,Ocean University of China,Qingdao,Shandong,China
3.School of Marine Sciences,Sun Yat-Sen University,Zhuhai,China
4.State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou,China
5.State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing,China
6.Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai),Zhuhai,China
7.School of Environmental and Municipal Engineering,Qingdao University of Technology,Qingdao,China
8.Isotopomics in Chemical & Biological Oceanography (ICBO),Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,China
9.State Key Laboratory of Marine Pollution,City University of Hong Kong,Kowloon,Tat Chee Avenue, Hong Kong,China
10.Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering,Zhuhai,China
11.Research Center for Marine Ecology,First Institute of Oceanography,Ministry of Natural Resources,Qingdao,China

Yan，Zhenwei,Xin，Yu,Zhong，Xiaosong,et al. Dissolved organic nitrogen cycling revealed at the molecular level in the Bohai and Yellow Sea[J]. Water Research,2023,244.

Yan，Zhenwei.,Xin，Yu.,Zhong，Xiaosong.,Yi，Yuanbi.,Li，Penghui.,...&He，Ding.(2023).Dissolved organic nitrogen cycling revealed at the molecular level in the Bohai and Yellow Sea.Water Research,244.

Yan，Zhenwei,et al."Dissolved organic nitrogen cycling revealed at the molecular level in the Bohai and Yellow Sea".Water Research 244(2023).