夏季南黄海颗粒氮同位素分布特征及影响因素研究

晏茂军; 董书航; 钟晓松; 宁晓燕; 辛宇

doi:10.3969/j.issn.0253-4193.2019.12.002

夏季南黄海颗粒氮同位素分布特征及影响因素研究

doi: 10.3969/j.issn.0253-4193.2019.12.002

1.
中国海洋大学化学化工学院，山东青岛 266100
2.
中国海洋大学海洋化学理论与工程技术教育部重点实验室，山东青岛 266100

基金项目: 国家自然科学基金面上项目（41576082）；青岛海洋科学与技术国家实验室“鳌山人才”计划项目（2015ASTP-OS08）。

详细信息

作者简介:
晏茂军（1993—），男，河南省信阳市人，主要从事海洋氮循环过程研究。E-mail：yanmaojun@sjtu.edu.cn

通讯作者:
辛宇，讲师，主要从事同位素示踪海洋氮循环过程研究。E-mail：xinyu312@ouc.edu.cn

中图分类号: P734.2
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出版历程
- 收稿日期: 2019-04-12
- 修回日期: 2019-07-22
- 网络出版日期: 2021-04-21
- 刊出日期: 2019-12-25

A study on particulate nitrogen isotope distribution, isotope characteristics and controlling factors in the southern Yellow Sea in summer

1.
Collge of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100 China
2.
Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education, Ocean University of China, Qingdao 266100, China

摘要

摘要: 黄海是人类活动影响显著的半封闭陆架边缘海，在夏季存在特征鲜明的冷水团结构。为研究南黄海颗粒态氮的循环转化过程，本文通过分析2016年夏季南黄海水体颗粒物和表层沉积物的碳、氮含量及同位素，探讨南黄海近岸海域和冷水团海域颗粒物和表层沉积物氮含量、同位素的分布差异和影响因素。近岸海域颗粒氮(Particulate Nitrogen，PN)呈现出含量较高、氮同位素值(δ¹⁵N_PN)垂向差异较小、沉积物总氮(Total Nitrogen，TN)含量较低且氮同位素值(δ¹⁵N_TN)偏负的分布特征；冷水团海域PN呈现出含量低、δ¹⁵N_PN垂向差异显著、沉积物TN含量高且δ¹⁵N_TN偏正的分布特征。通过海底边界剪切应力模拟、环境因子分析并结合颗粒物与沉积物δ¹⁵N示踪分析，发现南黄海海域颗粒态氮及同位素分布主要受到水体/底边界动力过程影响，陆源输入和矿化过程亦共同参与调控。
- 南黄海 /
- 颗粒氮 /
- 沉积物 /
- 氮同位素
Abstract: Yellow Sea is a semi-enclosed marginal sea that is significantly impacted by human activities. One of the major characteristics of Yellow Sea is the long-term existence of intensive cold water mass in summer. In order to study the cycling of particulate nitrogen in summer Yellow Sea, we analyzed the organic carbon and nitrogen content and isotope of the suspended particulate matter and of the surface sediments in South Yellow Sea in summer, 2016. We focus on the spatial variances in particulate nitrogen content, isotope character and the controlling factors respectively in coastal waters and cold water masse realm. In the coastal waters, the particulate nitrogen (PN) are comparatively higher and the vertical variances of nitrogen isotope (δ¹⁵N_PN) are small, while total nitrogen content (TN) in coastal sediment are lower and the nitrogen isotope (δ¹⁵N_TN) are mostly negative. In central south Yellow Sea where cold water masses exists, the PN is characterized of low content, significant vertical variances in δ¹⁵N_PN, while TN in sediment are characterized of high content and positive δ¹⁵N_TN. We further run bottom critical shear stress simulation and environmental factors analysis, and found out that the spatial variances of particulate nitrogen content and nitrogen isotopes in the South Yellow Sea was mainly controlled by the vertical mixing in water column, benthic boundary dynamic processes, and partially contributed by re-mineralization and terrestrial PN input.
- southern Yellow Sea /
- particulate nitrogen /
- marine sediment /
- nitrogen isotope

HTML全文

图 1 近海水体颗粒氮主要循环过程^{[7, 13]}（图中悬浮体迁移参考韦钦胜等^[14]）

Fig. 1 Sketch of major cycling of marine particulate nitrogen at marginal sea^{[7, 13]}（particulate matter migration refers to Wei et al.^[14]）

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图 2 南黄海采样站位分布

蓝色圆点站位颗粒物、沉积物和水体样品全部采集，黑色圆点站位只采集悬浮颗粒物和水体样品；南黄海主要海流和水团（CDW：长江冲淡水，YSCC：黄海沿岸流，KCC：朝鲜沿岸流，TWC：台湾暖流，KC：黑潮，YSCWM：黄海冷水团）^[39]由蓝色箭头标识；A、B为2个断面标识,色棒标识水深

Fig. 2 Sampling stations in the southern Yellow Sea

Blue points stand for stations of water, particle matter and sediment sampling; black points stand for stations of water and particle matter sampling; main water masses include Changjiang Diluted Water (CDW) ,Yellow Sea Coastal Current (YSCC), Korean Coastal Current (KCC), Taiwan Warm Current (TWC), Kuroshio Current (KC) and Yellow Sea Cold Water Mass (YSCDM); A and B stand for two sections at 36°N and 35.5°N; color bar stands for the bottom depth

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图 3 南黄海表、底层颗粒物PN（a、b）及碳（c、d）、氮（e、f）同位素分布

Fig. 3 Spatial distribution of PN (a, b), δ¹³C_POC (c, d) and δ¹⁵N_PN (e, f) at surface and bottom in the southern Yellow Sea

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图 4 南海黄沉积物TOC（a）、TN（b）含量及碳（c）、氮同位素（d）分布

Fig. 4 Spatial distribution of TOC (a), TN (b), δ¹³C_TOC (c) and δ¹⁵N_TN (d) in sediments of the southern Yellow Sea

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图 5 A、B断面温度、盐度断面分布

Fig. 5 Vertical distribution of temperature in sectionS A (a) and B (b)

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图 6 南黄海底层环境参数主成分分析

（a）及划分水团（b）绿色三角代表冷水团特征站位，黑色矩形和蓝色圆形代表近岸站位

Fig. 6 Results of principal component analysis of environment parameters at bottom layer (a) and stations categorized based on principal component analysis in the southern Yellow Sea

Cold water masses stations are marked with green triangles, inshore stations are marked with blues circle and black squares

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图 7 调查站位水体SPM质量浓度（a）、POC（b）、δ¹³C_POC（c）、PN%（d）、PN（e）和δ¹⁵N_PN（f）随底深变化

绿色三角代表冷水团特征站位，黑色矩形和蓝色圆形代表近岸站位

Fig. 7 Variation of SPM concentration(a), POC(b), δ¹³C_POC(c)、PN%(d)、PN(e) and δ¹⁵N_PN（f）with bottom depth

Cold water masses stations are marked with green triangles, inshore stations are marked with blue circles and black squares

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图 8 表层沉积物碳氮比（a）、海源有机碳占比（b）分布

Fig. 8 Spatial distribution of sediment C/N ratio (a) and organic matter proportion of marine source (b) in surface sediments of the southern Yellow Sea

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图 9 南黄海沉积物TN_sed与底临界应力关系（a）；南黄海沉积物δ¹⁵N_TN与底临界应力关系(b)

绿色三角代表冷水团站位，蓝色圆点和黑色矩形代表近岸站位

Fig. 9 Relationship between bottom critical shear stress (τ) and sedimentary TN % (a) and δ¹⁵N_TN (b) in sediments of the southern Yellow Sea

Cold watermasses stations are marked with green triangles, inshore stations are marked with black square and blue circles

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图 10 沉积物与表层颗粒物δ¹⁵N偏差值（a）及随底边界应力变化关系（b）

绿色三角代表冷水团站位，黑色矩形代表近岸站位

Fig. 10 Spatial distribution of δ¹⁵N deviation between sediments and surface particulate nitrogen (a) and relationship of δ¹⁵N deviation versus τ (b)

Cold watermasses stations are marked with green triangles, inshore stations are marked with black square and blue circles

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