极地研究

极地研究

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南极普里兹湾海域夏季表层水体颗粒有机碳及其同位素分布特征

尹希杰1李云海1乔磊2 王爱军1 徐勇航1 陈坚1   

  1.  
    1国家海洋局第三海洋研究所, 福建 厦门 361005；
    2 Hydrometeorology and Remote Sensing Laboratory, University of Oklahoma, Norman, OK 73019 USA
  • 出版日期:2014-03-30 发布日期:2014-03-30

  DISTRIBUTION OF PARTICULATE ORGANIC CARBON（POC）AND δ13CPOC IN SURFACE WATERS IN SUMMER IN THE PRYDZ BAY, ANTARCTICA

Yin Xijie 1, Li Yunhai 1, Qiao Lei 2, Wang Aijun 1, Xu Yonghang 1, Chen Jian 1   

  1.  
    1Third Institute of Oceanography, SOA, Fujian Xiamen 361005；
    2 Hydrometeorology and Remote Sensing Laboratory, University of Oklahoma, Norman, OK 73019 USA
  • Online:2014-03-30 Published:2014-03-30

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被引次数

5

摘要： 基于“第二十九次南极科学考察”中普里兹湾海域采集61个站位的表层悬浮体样品的颗粒有机碳（POC）及其稳定同位素（δ13CPOC）测试结果，结合卫星遥感解译的研究区表层水温、叶绿素a浓度和海冰覆盖率数据，研究了普利兹湾海域表层悬浮POC的分布特征，探讨了悬浮体中POC的来源及其形成过程。结果表明，2013年夏季普里兹湾表层悬浮POC浓度为0.28-0.84 mg·L-1，平均浓度为0.48 mg·L-1；δ13CPOC值的变化范围为-29.68‰至-26.30‰，平均为-28.01 ‰。表层悬浮POC分布呈现近岸高于远岸，西部高于东部的特征。POC的高值区主要分布在冰架附近，与表层水体叶绿素a浓度和海冰覆盖率分布趋势基本一致，表明夏季普里兹湾表层悬浮POC主要由浮游植物现场生产，而浮游植物的生长受到了海冰的显著影响。在普里兹湾外部海域悬浮颗粒物δ13CPOC值上从东向西逐渐偏负，而调查区东部从近岸向远海逐渐偏负，反映该海域δ13CPOC分布特征主要受到浮游植物吸收、固定CO2速率的影响。中山站附近海域悬浮颗粒物δ13CPOC值显著偏负，可能是受到近岸海域陆源有机质输入和浮游生物种属改变的影响。

关键词: 悬浮颗粒物, 颗粒有机碳（POC）, 颗粒有机碳同位素（&delta, 13CPOC）, 普里兹湾

Abstract: 61 samples of surface suspension of particulate organic carbon (POC) were collected in Prydz Bay by the 29th China Antarctic scientific expedition. The influencing factors of POC distribution, sources and transport processes were studied through analyzing the distribution of the POC and δ13CPOC value and the surface sea temperature, chlorophyll a concentration and sea ice coverage distributions measured by the satellite remote sensing. The results showed that POC concentration in the surface layer of Prydz Bay was 0.28-0.84 mg·L-1, with an average of 0.48mg·L-1. δ13CPOC values varied from -29.68 ‰ to -26.30 ‰, with an average value of -28.01 ‰. The surface POC distribution in summer shows that high values ??of POC are mainly distributed near ice shelves and POC in western survey area is higher than that in the eastern region. POC content has good correlation with chlorophyll a concentration and sea ice coverage, suggesting that POC was mainly from the phytoplankton production in the local water columns, while the growth of phytoplankton was obviously affected by sea ice. δ13CPOC value gradually decreases from east to west of the outside Prydz Bay, while from the shore to the sea δ13CPOC value gradually become more negative in the eastern survey area, suggesting that δ13CPOC was mainly influenced by the phytoplankton fixation CO2 rate outside Prydz Bay waters. δ13CPOC value in coastal waters near Zhongshan Station was significantly more negative, Terrigenous organic detritus inputs and changes in phytoplankton species might be have contributed to the carbon isotopic values of POC.

Key words: suspended particulate matter, particulate organic carbon (POC), carbon isotopic of particulate organic carbon (δ13CPOC), Prydz Bay