Institutional Repository of Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences (KLCEP)
| A nitrate budget of the Bohai Sea based on an isotope mass balance model | |
Tian, Shichao1; Gaye, Birgit1; Tang, Jianhui2 ; Luo, Yongming2,3; Li, Wenguo4; Lahajnar, Niko1; Dahnke, Kirstin5; Sanders, Tina5; Xiong, Tianqi6; Zhai, Weidong6; Emeis, Kay-Christian1,5
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| Source Publication | BIOGEOSCIENCES
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| ISSN | 1726-4170 |
| 2022-05-06 | |
| Volume | 19Issue:9Pages:2397-2415 |
| DOI | 10.5194/bg-19-2397-2022 |
| Corresponding Author | Tian, Shichao(shichao.tian@uni-hamburg.de) |
| Abstract | The Bohai Sea (BHS) is a semi-closed marginal sea impacted by one of the most populated areas of China. The supply of nutrients, markedly that of reactive nitrogen, via fluvial and atmospheric transport has strongly increased in parallel with the growing population. Therefore, it is crucial to quantify the reactive nitrogen input to the BHS and understand the processes and determine the quantities of nitrogen eliminated in and exported from the BHS. The nitrogen budget and in particular the internal sources and sinks of nitrate were constrained by using a mass-based and dual stable isotope approach based on delta N-15 and delta O-18 of nitrate (NO;). Samples of water, suspended matter, and sediments were taken in the BHS in spring (March and April) and summer (July and August) 2018. The Yellow River (YR) was sampled in May and July to November, and Daliao River, Hai River, Luan River, and Xiaoqing River were sampled in November of 2018. In addition to nutrient, particulate organic carbon, and nitrogen concentrations, the dual isotopes of nitrate (delta N-15 and delta O-18), delta N-15 of suspended matters, and sediments were determined. Based on the available mass fluxes and isotope data an updated nitrogen budget is proposed. Compared to previous estimates, it is more complete and includes the impact of interior cycling (nitrification) on the nitrate pool. The main nitrate sources are rivers contributing 19.2 %-25.6 % and the combined terrestrial runoff (including submarine fresh groundwater discharge of nitrate) accounting for 27.8 %-37.1 % of the nitrate input to the BHS, while atmospheric input contributes 6.9 %-22.2 % to total nitrate. An unusually active interior nitrogen cycling contributes 40.7 %-65.3 % to total nitrate via nitrification. Nitrogen is mainly trapped in the BHS and mainly removed by sedimentation (70.4 %-77.8 %), and only very little is exported to the Yellow Sea (YS) (only 1.8 %-2.4 %). At present denitrification is active in the sediments and removes 20.4 %-27.2 % of nitrate from the pool. However, a further eutrophication of the BHS could induce water column hypoxia and denitrification, as is increasingly observed in other marginal seas and seasonally off river mouths. |
| Funding Organization | Bundesministerium fur Bildung und Forschung |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | NITROGEN ; PHYTOPLANKTON |
| WOS Research Area | Environmental Sciences & Ecology ; Geology |
| WOS ID | WOS:000791262300001 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.yic.ac.cn/handle/133337/31238 |
| Collection | 中国科学院海岸带环境过程与生态修复重点实验室 中国科学院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室 |
| Corresponding Author | Tian, Shichao |
| Affiliation | 1.Univ Hamburg, Inst Geol, D-20146 Hamburg, Germany 2.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Yantai, Peoples R China 3.Chinese Acad Sci, Inst Soil Sci, Nanjing, Peoples R China 4.Univ Hamburg, Inst Oceanog, D-20146 Hamburg, Germany 5.Helmholtz Zentrum Hereon, Inst Coastal Res, D-21502 Geesthacht, Germany 6.Shandong Univ, Inst Marine Sci & Technol, Qingdao, Peoples R China |
| Recommended Citation GB/T 7714 | Tian, Shichao,Gaye, Birgit,Tang, Jianhui,et al. A nitrate budget of the Bohai Sea based on an isotope mass balance model[J]. BIOGEOSCIENCES,2022,19(9):2397-2415. |
| APA | Tian, Shichao.,Gaye, Birgit.,Tang, Jianhui.,Luo, Yongming.,Li, Wenguo.,...&Emeis, Kay-Christian.(2022).A nitrate budget of the Bohai Sea based on an isotope mass balance model.BIOGEOSCIENCES,19(9),2397-2415. |
| MLA | Tian, Shichao,et al."A nitrate budget of the Bohai Sea based on an isotope mass balance model".BIOGEOSCIENCES 19.9(2022):2397-2415. |
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