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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

夏逸,胡利民,黄元辉,等. 北极拉普捷夫海夏、秋季颗粒有机碳的分布与来源[J]. 海洋学报,2022,44(7):52–64 doi: 10.12284/hyxb2022102
引用本文: 夏逸,胡利民,黄元辉,等. 北极拉普捷夫海夏、秋季颗粒有机碳的分布与来源[J]. 海洋学报,2022,44(7):52–64 doi: 10.12284/hyxb2022102
Xia Yi,Hu Limin,Huang Yuanhui, et al. Distribution and source of particulate organic carbon in the Arctic Laptev Sea during late summer and early fall[J]. Haiyang Xuebao,2022, 44(7):52–64 doi: 10.12284/hyxb2022102
Citation: Xia Yi,Hu Limin,Huang Yuanhui, et al. Distribution and source of particulate organic carbon in the Arctic Laptev Sea during late summer and early fall[J]. Haiyang Xuebao,2022, 44(7):52–64 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
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

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

  • 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(TSS)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(DIC)的过程也对该区域POC的供应和来源解析具有重要的影响。
  • 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 reference [14, 32]

    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

    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

    图  4  不同层位TSS浓度与POC浓度的相关关系

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

    图  5  不同层位POC质量分数(POC%)与TSS浓度相关关系

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

    图  6  剖面站位及不同层位TSS、POC、PN浓度变化趋势

    图中灰色趋势线利用三点平滑法做得

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

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

    图  7  研究区δ13CPOC值水平分布

    Fig.  7  Horizontal distribution of δ13CPOC in surface and bottom layers in the study area

    图  8  拉普捷夫海、东西伯利亚海、楚科奇海POC/PN和δ13CPOC值散点图

    Fig.  8  The scatter plot of C/N ratio and δ13CPOC in Laptev Sea, East Siberian Sea and Chukchi Sea

    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 δ13CPOC and salinity in Laptev Sea and East Siberian Sea

    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]

    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]
    下载: 导出CSV

    表  2  不同POC端元的δ13C和C/N值

    Tab.  2  The characteristic δ13C and C/N ratio of different endmembers

    端元POCδ13C值/‰C/N参考文献
    陆源POC(河流、冻土)−29.50~−25.6314~16文献[2526, 5558]
    海洋POC−24.00~−17.006~8文献[26, 32, 59]
    下载: 导出CSV
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  • 收稿日期:  2021-09-14
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