| Sha Longbin,Li Dongling,Liu Yanguang,Wu Bin,Wu Yanni,Knudsen Karen Luise,Li Zhongqiao,Xu Hao. 2020. Biogenic silica concentration as a marine primary productivity proxy in the Holsteinsborg Dyb, West Greenland, during the last millennium. Acta Oceanologica Sinica, 39(9):78－85 |
| Biogenic silica concentration as a marine primary productivity proxy in the Holsteinsborg Dyb, West Greenland, during the last millennium |
| 近1000年来西格陵兰荷尔斯泰因斯堡港生物硅指示的海洋生产力变化 |
| Received:December 09, 2019 |
| DOI：10.1007/s13131-020-1648-3 |
| Key words:biogenic silica marine productivity sea-surface temperature sea-ice concentration |
| 中文关键词: 生物硅 海洋生产力 海水表层温度 海冰密集度 |
| 基金项目:The Open Research Fund of State Key Laboratory of Estuarine and Coastal Research under contract No. SKLEC-KF201708; the Project of Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao) under contract No. MGQNLM201707; the National Natural Science Foundation of China under contract Nos 41776193, 41876215, 41876070 and 41406209; the Natural Science Foundation of Zhejiang Province under contract Nos LY17D060001 and LQ15D020001; the Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao) under contract No. 2018SDKJ0104-3. |
| Author Name | Affiliation | E-mail | | Sha Longbin | Department of Geography and Spatial Information Techniques, Ningbo University, Ningbo 315211, China
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China | | | Li Dongling | Department of Geography and Spatial Information Techniques, Ningbo University, Ningbo 315211, China | lidongling@nbu.edu.cn | | Liu Yanguang | Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | yanguangliu@fio.org.cn | | Wu Bin | Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | Wu Yanni | Department of Geography and Spatial Information Techniques, Ningbo University, Ningbo 315211, China | | | Knudsen Karen Luise | Centre for Past Climate Studies and Arctic Research Centre, Department of Geoscience, Aarhus University, Aarhus C DK-8000, Denmark | | | Li Zhongqiao | Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | Xu Hao | Department of Geography and Spatial Information Techniques, Ningbo University, Ningbo 315211, China | |
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| Abstract: |
| We analyzed the biogenic silica (BSi) content and produced a diatom-based summer sea-surface temperature (SST) reconstruction for sediment core GC4 from the Holsteinsborg Dyb, West Greenland. Our aim was to reconstruct marine productivity and climatic fluctuations during the last millennium. Increased BSi content and diatom abundance suggest relatively high marine productively during the interval of AD 1000–1400, corresponding in time to the Medieval Warm Period (MWP). The summer SST reconstruction indicates relatively warm conditions during AD 900–1100, followed by cooling after AD 1100. An extended cooling period during AD 1400–1900 is characterized by prolonged low in reconstructed SST and high sea-ice concentration. The BSi values fluctuated during this period, suggesting varying marine productivity during the Little Ice Age (LIA). There is no significant correlation between the BSi content and SST during the last millennium, suggesting that the summer SST has little influence on marine productively in the Holsteinsborg Dyb. A good correspondence between the BSi content and the element Ti counts in core GC4 suggests that silicate-rich meltwater from the Greenland ice sheet was likely responsible for changes in marine productively in the Holsteinsborg Dyb. |
| 中文摘要: |
| 本文通过对西格陵兰荷尔斯泰因斯堡港生物硅的含量变化及海水表层温度的重建，恢复了西格陵兰近1000年来的古海洋生产力与古气候变化。AD 1000-1400，生物硅含量和硅藻丰度呈增加趋势，指示荷尔斯泰因斯堡港海洋生产力较高，对应于中世纪暖期（MWP）。海水表层温度重建结果显示，AD 900-1000温度较高，从AD 1100开始，海水表层温度逐渐下降，AD 1400-1900期间海水表层温度持续偏低，与研究区当时较高的海冰密集度相对应。生物硅含量在AD 1400-1900期间较为波动，表明小冰期期间研究区的海洋生产力呈波动变化。整个1000年以来，生物硅含量与海水表层温度变化之间几乎不存在相关性，表明海水表层温度对近1000年来荷尔斯泰因斯堡港海洋生产力的影响甚微。相比之下，同一钻孔指示陆源输入的Ti元素含量与生物硅之间存在较好的相关性，表明研究区近1000年来的海洋生产力变化可能主要受富含硅的格陵兰冰盖冰融水的输入控制。 |
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