globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.09.003
论文题名:
East Asian winter monsoon controlling phytoplankton productivity and community structure changes in the southeastern Southern China Sea over the last 185kyr
作者: Li D.; Zhao M.; Chen M.-T.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 414
起始页码: 233
结束页码: 242
语种: 英语
英文关键词: Biomarker ; Community structure ; East Asian winter monsoon ; Phytoplankton productivity ; South China Sea
英文摘要: The South China Sea (SCS) is one of the largest marginal seas in the world and it plays an important role in regional climate change and carbon cycles. However, mechanisms of glacial-interglacial phytoplankton productivity changes remain under-studied, especially for the southeastern SCS. In this study, the productivity record for the southeastern SCS (core MD972142) over the last 185kyr was generated using multiple biomarkers, including C37 alkenones (C37:2+C37:3), brassicasterol, dinosterol, and alkyl diols (C30+C32) as productivity proxies for haptophytes, diatoms, dinoflagellates, and eustigmatophytes (and diatoms), respectively. All biomarker contents indicate higher individual as well as total phytoplankton productivities during peak glacials than during interglacials. Our records afford a better constraint on spatial pattern of glacial productivity changes, which suggest that both the southeastern and northern SCS glacial productivity increases were controlled by the stronger East Asian winter monsoon (EAWM), which brought more nutrients to the surface through stronger mixing of nutrient-rich deep waters. Biomarker ratios reveal a relatively stable phytoplankton community structure (PCS), but relative diatom productivity was higher during glacials. The PCS record is consistent with stronger EAWM forcing during glacials, which supplied nutrients to the surface with relatively stable composition. The decrease of C37 alkenones during the last 120kyr is likely a global phenomenon, which could be related to the evolution of the haptophytes. In the SCS, this trend was also likely caused by changes of subsurface nutrient supply to the SCS, which significantly modulated the PCS by a gradual decrease of haptophyte contribution to total phytoplankton in the northern and southeastern SCS since MIS 5. © 2014 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69519
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作者单位: Key Laboratory of Marine Chemistry Theory and Technology (Ocean University of China), Ministry of Education/Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao, China; Institute of Marine Organic Geochemistry, Ocean University of China, Qingdao, China; Institute of Applied Geophysics, National Taiwan Ocean University, Keelung, Taiwan

Recommended Citation:
Li D.,Zhao M.,Chen M.-T.. East Asian winter monsoon controlling phytoplankton productivity and community structure changes in the southeastern Southern China Sea over the last 185kyr[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,414
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