| 摘要: |
| 北冰洋西伯利亚陆架海是北极气候快速变化最为显著的海域之一，而沉积硅藻作为极地海洋生态系统的重要组成部分，对环境变化具有敏感的响应。对楚科奇海、东西伯利亚海和拉普捷夫海表层沉积物开展了硅藻组成鉴定，利用典型对应分析方法分析了硅藻属种与1986~2015年环境变量之间的关系。结果表明，夏季和秋季海冰密集度、表层海水盐度是影响研究区表层硅藻分布特征最主要的因素。此外，根据表层站位与环境变量的典型对应分析，可将西伯利亚极地海域划分为4个区域，分别为海冰硅藻组合带、暖水硅藻组合带、沿岸硅藻组合带和混合硅藻组合带。这些表层站位的分区与相应区域的海流模式有明显的相关性，海冰硅藻组合带仅分布于研究区北部的高纬度地区；暖水硅藻组合带位于受白令水和太平洋海水的分支——阿拉斯加沿岸水影响为主的区域；拉普捷夫海南部的沿岸硅藻组合带则受到河流径流和西伯利亚沿岸流的强烈影响；混合硅藻组合带受极地冷水、海冰覆盖、太平洋暖水和陆地径流的共同影响。 |
| 关键词: 硅藻 环境变量 西伯利亚极地海域 典型对应分析 |
| DOI：10.11693/hyhz20220700182 |
| 分类号: |
| 基金项目:国家自然科学基金，41876215号，42176226号，42176245号，42130412号；浙江省省属高校基本科研业务项目，SJLY2020004号。 |
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| DIATOM ASSEMBLAGES IN SURFACE SEDIMENT IN THE SIBERIAN ARCTIC SEAS AND THEIR RELATIONSHIP TO OCEANIC ENVIRONMENTAL VARIABLES |
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LI Xian-Fu1, LIU Yan-Guang2, QIU Yue1, HUANG Yuan-Hui2, XU Hao1, LI Dong-Ling1
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1.Department of Geography and Spatial Information Techniques, Ningbo University, Ningbo 315211, China;2.Key Laboratory of Marine Geology and Metallogeny, Ministry of Natural Resources, Qingdao 266061, China
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| Abstract: |
| The Siberian shelf sea in the Arctic Ocean is one of the most remarkable areas affected by rapid change in the Arctic climate. As an important part of the polar marine ecosystem, sedimentary diatoms have a sensitive response to environmental changes. The diatom composition in the surface sediments of Chukchi, East Siberian and Laptev Seas were identified and the relationship between diatom species and environmental variables data (sea surface temperatures, sea ice concentrations, and sea surface salinity) from 1986 to 2015 were analyzed by using canonical correspondence analysis method. Results show that summer and autumn sea ice concentrations, and sea surface salinity are main environmental factors affecting the distribution of diatoms in those area. In addition, as shown in the canonical correspondence analysis between surface samples and oceanographic environmental variables, the Siberia polar sea could be divided into four regions, namely the sea-ice diatom zone, the warm water diatom zone, the coastal diatom zone, and the mixing diatom zone. The zonation of these surface samples was significantly correlated with patterns of ocean current in the corresponding regions. The sea-ice diatom zone was limited to the northern part of the study area at higher latitudes; and the warm water diatom zone was located in the area dominated by Bering Sea Water and Alaska Coastal Water, a branch of warm Pacific waters; the coastal diatom zone in the southern Laptev Sea was strongly influenced by both river discharge and the Siberian Coastal Current; and the mixing diatom zone was controlled by the combined effects of cold polar water, sea ice cover, warm Pacific water, and land runoff. |
| Key words: diatom environmental variables Siberian Arctic Seas canonical correspondence analysis |
