Biogenic silica concentration as a marine primary productivity proxy in the Holsteinsborg Dyb, West Greenland, during th
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Biogenic silica concentration as a marine primary productivity proxy in the Holsteinsborg Dyb, West Greenland, during the last millennium Longbin Sha1, 2, 3, Dongling Li1*, Yanguang Liu2, 4*, Bin Wu5, Yanni Wu1, Karen Luise Knudsen6, Zhongqiao Li5, Hao Xu1 1 Department of Geography and Spatial Information Techniques, Ningbo University, Ningbo 315211, China 2 Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao
266237, China 3 State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China 4 Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of
Natural Resources, Qingdao 266061, China 5 Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, Ministry of Natural
Resources, Hangzhou 310012, China 6 Centre for Past Climate Studies and Arctic Research Centre, Department of Geoscience, Aarhus University, Aarhus C
DK-8000, Denmark Received 9 December 2019; accepted 19 December 2019 © Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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. Key words: biogenic silica, marine productivity, sea-surface temperature, sea-ice concentration Citation: 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, doi: 10.1007/s13131-020-1648-3
1 Introduction Since 1978, Arctic sea ice concentration has decreased by ~9% every decade, accompanied by a decrease in its thickness and duration (Comiso, 2012; Maslanik e
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