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| Distribution and Dynamics of Dissolved Organic Matter in the Changjiang Estuary and Adjacent Sea | |
| Guo, Jinqiang1,2,3; Liang, Shengkang1,4; Wang, Xinke1,4; Pan, Xiaoju1,4,5 | |
| 2021-12-01 | |
| 发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
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| ISSN | 2169-8953 |
| 卷号 | 126期号:12页码:19 |
| 通讯作者 | Liang, Shengkang(liangsk@ouc.edu.cn) |
| 摘要 | Large, river-dominated estuaries provide important land-ocean interfaces for biogenic element fluxes that impact global marine biogeochemistry. However, the reactivity and fate of dissolved organic matter (DOM) in this dynamic region remain not well understood. In this study, three cruises were conducted in February, May, and July 2017 in the Changjiang Estuary and adjacent sea (CEAS). Incubation experiments to determine photochemically and/or biologically mediated degradation of terrigenous and marine DOM were performed. Dissolved organic carbon (DOC), chromophoric DOM (CDOM) absorption, and total dissolved amino acids (TDAAs) were measured. DOM photodegradation and transformation were indicated by the CDOM spectral slope (S275-295) and diagenetic state by DOC-normalized yields of TDAA [TDAA (%DOC)]. From the river to the open sea, DOC showed non-conservative mixing and was rapidly removed in low salinity areas. Photodegradation, biodegradation, and photoenhanced biodegradation are important DOC removal mechanisms and exhibit specific responses depending on DOC source and composition. Terrigenous DOM is vulnerable to photodegradation, while marine DOM experiences rapid biodegradation. Contrary to DOC, TDAA (%DOC) increased from the river to the nearshore and then decreased toward the open sea, indicating the contribution of fresh marine plankton production. A box model showed that the annual DOC removal of CEAS was 2.6 +/- 1.9 x 10(6) tons. Seaward increase of ammonium (NH4-N) was observed in the CEAS; photoammonification, biomineralization of autochthonous and allochthonous DOM are potential NH4-N regeneration mechanisms. A model was developed to calculate surface DOC concentrations based on CDOM absorption coefficients allowing high-resolution monitoring of DOC in the CEAS. |
| 关键词 | Changjiang estuary dissolved organic matter amino acids photochemistry biodegradation |
| DOI | 10.1029/2020JG006161 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Key Research and Development Program of China[2018YFC1407602] ; Major Scientific and Technological Innovation Project[2019JZZY020705] ; Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf[2020KF02] |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology |
| WOS类目 | Environmental Sciences ; Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000734472100009 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/177627 |
| 专题 | 海洋生态与环境科学重点实验室 |
| 通讯作者 | Liang, Shengkang |
| 作者单位 | 1.Ocean Univ China, Minist Educ, Key Lab Marine Chem Theory & Technol, Qingdao, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China 4.Ocean Univ China, Frontiers Sci Ctr Deep Ocean Multispheres & Eart, Qingdao, Peoples R China 5.Hainan Trop Ocean Univ, Coll Marine Sci & Technol, Sanya, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Guo, Jinqiang,Liang, Shengkang,Wang, Xinke,et al. Distribution and Dynamics of Dissolved Organic Matter in the Changjiang Estuary and Adjacent Sea[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2021,126(12):19. |
| APA | Guo, Jinqiang,Liang, Shengkang,Wang, Xinke,&Pan, Xiaoju.(2021).Distribution and Dynamics of Dissolved Organic Matter in the Changjiang Estuary and Adjacent Sea.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,126(12),19. |
| MLA | Guo, Jinqiang,et al."Distribution and Dynamics of Dissolved Organic Matter in the Changjiang Estuary and Adjacent Sea".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 126.12(2021):19. |
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