北极拉普捷夫海夏、秋季颗粒有机碳的分布与来源

夏逸; 胡利民; 黄元辉; 白亚之; 叶君; 范迪; 孟宪伟; 石学法

doi:10.12284/hyxb2022102

北极拉普捷夫海夏、秋季颗粒有机碳的分布与来源

doi: 10.12284/hyxb2022102

夏逸^1,,
胡利民^{2, 3, ,},
黄元辉^{1, 3},
白亚之^{1, 3},
叶君^{2, 3},
范迪⁴,
孟宪伟^{1, 3},
石学法^{1, 3}

1.
自然资源部第一海洋研究所海洋地质与成矿作用重点实验室，山东青岛 266061
2.
中国海洋大学海洋地球科学学院海底科学与探测技术教育部重点实验室，山东青岛 266100
3.
青岛海洋科学与技术试点国家实验室海洋地质过程与环境功能实验室，山东青岛 266237
4.
青岛海洋科学与技术试点国家实验室海洋同位素与地质年代测定平台，山东青岛 266237

基金项目: 国家自然科学基金（42130412, 42076074）；山东省“透明海洋”科技创新工程专项（2018SDK0104-3）；山东省“泰山学者”建设工程专项（TSQN20182117）。

详细信息

作者简介:
夏逸（1997-），男，湖北省鄂州市人，主要从事海洋沉积地球化学研究。E-mail: xy1997@fio.org.cn

通讯作者:
胡利民，男，教授，主要从事海洋沉积地球化学研究。E-mail: hulimin@ouc.edu.cn

中图分类号: P736.4
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出版历程
- 收稿日期: 2021-09-14
- 修回日期: 2021-12-10
- 网络出版日期: 2022-07-01
- 刊出日期: 2022-07-01

Distribution and source of particulate organic carbon in the Arctic Laptev Sea during late summer and early fall

Xia Yi^1
,,
Hu Limin^{2, 3
, ,},
Huang Yuanhui^{1, 3},
Bai Yazhi^{1, 3},
Ye Jun^{2, 3},
Fan Di⁴,
Meng Xianwei^{1, 3},
Shi Xuefa^{1, 3}

1.
Key Laboratory of Marine Geology and Mineralization, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Key Laboratory of Seabed Science and Exploration Technology, Ministry of Education, School of Marine Geosciences, Ocean University of China, Qingdao 266100, China
3.
Marine Geological Process and Environmental Function Laboratory, Pilot National Laboratory of Marine Science and Technology (Qingdao), Qingdao 266237, China
4.
Marine Isotope and Geological Dating Platform , Pilot National Laboratory of Marine Science and Technology (Qingdao), Qingdao 266237, China

摘要

摘要: 随着全球变暖的加剧，北极陆架边缘海碳的源汇过程对全球碳循环的影响及其气候环境效应日益显著。拉普捷夫海作为北冰洋典型的陆架边缘海，在大河、海冰、海洋初级生产力及海岸侵蚀的影响下，该区沉积有机碳的来源、输运和埋藏等过程独具特色。本文基于2018年中俄第二次北极联合科考获得的悬浮颗粒物样品和水文资料，研究了夏末秋初拉普捷夫海颗粒有机碳的分布特征、来源及其影响因素。结果表明，颗粒有机碳（POC）的浓度位于35.27～1 185.58 μg/L之间，平均为172.65 μg/L。受河流输入、海岸侵蚀和海洋初级生产力的影响，表层POC浓度分布呈现近岸高、远岸低趋势；底层POC浓度分布主要受控于沉积再悬浮作用，高浓度POC出现在勒拿河三角洲的东部区域。总悬浮颗粒物浓度与POC浓度总体呈显著正相关，显示出其对POC空间分布的直接影响，且两者在底层中的相关性要高于表层，表明不同层位的POC可能存在来源差异。研究区POC的δ¹³C值处于−31.03‰～−25.79‰之间，表层δ¹³C值较底层明显偏负，且部分站位的δ¹³C值甚至低于周边陆源有机碳的端元，这反映了可能除陆源输入的贡献外，近海浮游植物直接利用大量陆源有机质降解产生的溶解无机碳的过程也对该区域POC的供应和来源解析具有重要的影响。
- 北极；拉普捷夫海 /
- 颗粒有机碳 /
- 总悬浮颗粒物 /
- 来源 /
- 陆源输入
Abstract: With the intensification of global warming, the source sink process of carbon in the Arctic shelf-edge sea is becoming more and more important in the study of global carbon cycle. As a typical continental shelf marginal sea in the Arctic Ocean, the source, transportation and burial of sedimentary organic carbon in this area are unique under the influence of rivers, sea ice, marine primary productivity and coastal erosion. Based on the sampling of suspended particulate matter (SPM) and hydrological data obtained from the second Sino-Russian Arctic joint expedition during late summer and early fall in 2018, we foucus on the distribution characteristics, sources and influencing factors of particulate organic carbon (POC) in the Laptev Sea. The results show that POC ranges from 35.27 μg/L to 1 185.58 μg/L, with an average of 172.65 μg/L. Under the effect of river input, coastal erosion and marine primary productivity, the distribution of surface POC shows a decreased trend from near shore towards offshore; the bottom POC is mainly controlled by sediments resuspension, and the high content of POC appears in the east of Lena River Delta. There was a significant positive correlation between SPM concentration and POC concentration, indicating its direct impact on the occurrence of POC; a more positive relation is found among the bottom layer samples, which may indicate the varied origin of POC in different layers. The value of δ¹³C_POC in study area value is between −31.03‰ and −25.79‰, and the value of δ¹³C in surface layers is obviously depleted compared with the bottom layer, which is even lower than the end-member of the surrounding terrestrial contributor, suggesting that these POC is not derived from land-based origin. The utilization of the terrestrial POC degraded dissolved inorganic carbon by offshore phytoplankton maybe responsible for this depletion of δ¹³C offshore, which could also be an important process on the supply and source apportionment of POC in this Arctic coastal area.
- Arctic; Laptev Sea /
- particulate organic carbon /
- total suspended solids /
- source /
- terrigenous input

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图 1 北极东西伯利亚陆架区域概况及采样站位

环流模式改自文献[14, 32]

Fig. 1 Survey and sampling stations of the East Siberian Shelf in the Arctic

Circulation model modified from references [14, 32]

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图 2 研究区TSS浓度、POC浓度、PN浓度、盐度水平分布

Fig. 2 Horizontal distribution of TSS concentration, POC concentration, PN concentration and salinity in the study area

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图 3 底层TSS浓度（a）和POC浓度（b）与盐度相关性分析

Fig. 3 Correlation between TSS concentration (a), POC concentration (b) and salinity at the bottom

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图 4 不同层位TSS浓度与POC浓度的相关关系

Fig. 4 Correlation between TSS concentration and POC concentration in different layers

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图 5 不同层位POC质量分数（POC%）与TSS浓度相关关系

Fig. 5 Correlation between POC% and TSS concentration in different layers

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图 6 剖面站位及不同层位TSS、POC、PN浓度变化趋势

灰色趋势线利用三点平滑法获得

Fig. 6 Section stations and change trend of TSS, POC and PN concentrations in different layers

The gray trend line is made by three-point smoothing method

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图 7 研究区表层和底层δ¹³C_POC值水平分布

Fig. 7 Horizontal distribution of δ¹³C_POC in surface and bottom layers in the study area

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图 8 拉普捷夫海、东西伯利亚海、楚科奇海POC/PN和δ¹³C_POC值散点图

Fig. 8 The scatter plot of POC/PN and δ¹³C_POC in the Laptev Sea, East Siberian Sea and Chukchi Sea

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图 9 拉普捷夫海、东西伯利亚海表层POC的δ¹³C值和盐度的散点图

图中红色数据点为研究区表层数据（本文）；紫色数据点为拉普捷夫海和部分东西伯利亚海表层数据^[25]

Fig. 9 The scatter plot of δ¹³C_POC and salinity in the Laptev Sea and East Siberian Sea surface layer

The red data points in the figure are the surface data of the study area (this paper); the purple data points are the surface data of Laptev Sea and East Siberian Sea ^[25]

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表 1 不同海域海水中POC的浓度

Tab. 1 The concentrations of POC in different oceanic areas

海区	采样时间	POC浓度/（μg·L⁻¹）	资料来源
勒拿河口	2018年9−10月	141.06～1 185.58	本文
拉普捷夫海陆架	2018年9−10月	35.27～104.07	本文
东西伯利亚海陆架	2018年9−10月	57.80～243.90	本文
东西伯利亚海	2016年8−9月	13.15～453.27	文献[32]
拉普捷夫海陆架	2014年7−8月	38.00～138.00	文献[33]
布奥尔哈亚湾及拉普捷夫海陆架	2008年8−9月	18.00～1 850.40	文献[25]
楚科奇海	2012年7−9月	60.93～466.60	文献[34]
喀拉海	2007年9月	6.30～2 404.70	文献[35]
东西伯利亚海陆架	2018年9−10月	57.80～243.90	本文
长江口及其东海陆架	2015年11月	650.00～8 250.00	文献[36]
黄河口及莱州湾	2012年9月	42.25～1 018.87	文献[37]

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表 2 不同POC端元的δ¹³C和C/N值

Tab. 2 The characteristic δ¹³C and C/N ratio of different POC end members

端元POC	δ¹³C值/‰	C/N	参考文献
陆源POC（河流、冻土）	−29.50～−25.63	14～16	文献[25−26, 55−58]
海洋POC	−24.00～−17.00	6～8	文献[26, 32, 59]

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