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王鑫,吴莹,曹梦莉,齐丽君,张经.沉积记录中脂类生物标志物对琼东上升流强度的指示及其影响因素初探[J].海洋学报,2020,42(10):28-36
沉积记录中脂类生物标志物对琼东上升流强度的指示及其影响因素初探
Indication of lipid biomarkers in sediment records for the Qiongdong Upwelling intensity and preliminary study of it's controlling factors
投稿时间:2019-11-10  修订日期:2020-06-29
DOI:10.3969/j.issn.0253-4193.2020.10.003
中文关键词:  生物标志物  琼东上升流  降解  上升流强度
英文关键词:biomarkers  Qiongdong Upwelling  degradation  upwelling intensity
基金项目:国家自然科学基金面上项目(41876074);国家重点基础研究发展计划(973)项目(2014CB441502)。
作者单位E-mail
王鑫 华东师范大学 河口海岸学国家重点实验室 上海 200241  
吴莹 华东师范大学 河口海岸学国家重点实验室 上海 200241 wuying@sklec.ecnu.edu.cn 
曹梦莉 华东师范大学 河口海岸学国家重点实验室 上海 200241  
齐丽君 华东师范大学 河口海岸学国家重点实验室 上海 200241  
张经 华东师范大学 河口海岸学国家重点实验室 上海 200241  
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中文摘要:
      本文对海南岛东部上升流边缘区域(S5站位)和上升流中心区域(S10站位)两根沉积柱进行了正构烷烃和脂肪酸的分析,结合有机碳含量、粒径、碳稳定同位素(δ13C)等参数综合分析其有机质来源与降解特征,并利用脂肪酸硅藻丰度参数∑C16∶∑C18重建了研究区域上升流强度年际变化。研究结果表明:S10站位处于上升流中心附近,粒径较粗,以砂为主;S5站位处于上升流边缘区域,粒径较细,以粉砂为主;两站位柱样δ13C值和长短链脂肪酸比值(∑C20-:0/∑C20+:0)显示有机质均以海源输入为主,S10站位有机质降解程度大于S5站位。脂肪酸中硅藻丰度参数和浮游植物脂肪酸占比指示了S10站位初级生产力高于S5,并利用∑C16∶∑C18指征了研究区域上升流强度及年际变化趋势。上升流强度在1925-1950年,1950-1980年和1980-2008年间表现为弱、强、弱的趋势,与太平洋年代际振荡(Pacific Decadal oscillator,PDO)年际变化趋势一致;推测厄尔尼诺-南方涛动(El Niño-Southern Oscillation,ENSO)在短时间尺度上可能对上升流强度有一定调节作用,但长时间尺度上可能主要受PDO调节作用。
英文摘要:
      The n-alkanes and fatty acids were analyzed in two sediment cores at the upwelling edge region (Station S5) and center area (Station S10) of eastern Hainan Island, the source and degradation characteristics of organic matter were comprehensively analyzed by combining organic carbon content, particle size, carbon stable isotope (δ13C) and other parameters. The interannual variation of upwelling intensity in the study area was reconstructed using the diatom abundance parameter ∑16∶∑18 of fatty acids. The grain size results show that Station S10 is located near the center of upwelling, with coarse grain size and mainly sand; Station S5 is located at the edge of upwelling, with fine grain size and mainly silt. The δ13C and fatty acids parameter (∑C20-:0/∑C20+:0) of the two stations show that both stations are dominated by marine source input. The degradation degree of organic matter in Station S10 is greater than that in Station S5 . The diatom abundance parameters of fatty acids and the percentage of phytoplankton fatty acid indicate the primary productivity of Station S10 is higher than Station S5, and ∑C16∶∑C18 is used to indicate the interannual variation of the intensities of the upwelling in the study area; the upwelling intensity shows weak, strong, and weak signals between 1925-1950, 1950-1980, and 1980-2008. It is consistent with the interdecadal trend of Pacific Decadal Oscillation. El Niño-Southern Oscillation may regulate the upwelling intensity in a short time scale, while in a long time scale, it may be mainly regulated by Pacific Decadal Oscillation.
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