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    王鑫,吳瑩,曹夢莉,齊麗君,張經.沉積記錄中脂類生物標志物對瓊東上升流強度的指示及其影響因素初探[J].海洋學報,2020,42(10):28-36
    沉積記錄中脂類生物標志物對瓊東上升流強度的指示及其影響因素初探
    Indication of lipid biomarkers in sediment records for the Qiongdong Upwelling intensity and preliminary study of it's controlling factors
    投稿時間:2019-11-10  修訂日期:2020-06-29
    DOI:10.3969/j.issn.0253-4193.2020.10.003
    中文關鍵詞:  生物標志物  瓊東上升流  降解  上升流強度
    英文關鍵詞:biomarkers  Qiongdong Upwelling  degradation  upwelling intensity
    基金項目:國家自然科學基金面上項目(41876074);國家重點基礎研究發展計劃(973)項目(2014CB441502)。
    作者單位E-mail
    王鑫 華東師范大學 河口海岸學國家重點實驗室, 上海 200241  
    吳瑩 華東師范大學 河口海岸學國家重點實驗室, 上海 200241 wuying@sklec.ecnu.edu.cn 
    曹夢莉 華東師范大學 河口海岸學國家重點實驗室, 上海 200241  
    齊麗君 華東師范大學 河口海岸學國家重點實驗室, 上海 200241  
    張經 華東師范大學 河口海岸學國家重點實驗室, 上海 200241  
    摘要點擊次數: 1300
    全文下載次數: 4364
    中文摘要:
          本文對海南島東部上升流邊緣區域(S5站位)和上升流中心區域(S10站位)兩根沉積柱進行了正構烷烴和脂肪酸的分析,結合有機碳含量、粒徑、碳穩定同位素(δ13C)等參數綜合分析其有機質來源與降解特征,并利用脂肪酸硅藻豐度參數∑C16∶∑C18重建了研究區域上升流強度年際變化。研究結果表明:S10站位處于上升流中心附近,粒徑較粗,以砂為主;S5站位處于上升流邊緣區域,粒徑較細,以粉砂為主;兩站位柱樣δ13C值和長短鏈脂肪酸比值(∑C20-:0/∑C20+:0)顯示有機質均以海源輸入為主,S10站位有機質降解程度大于S5站位。脂肪酸中硅藻豐度參數和浮游植物脂肪酸占比指示了S10站位初級生產力高于S5,并利用∑C16∶∑C18指征了研究區域上升流強度及年際變化趨勢。上升流強度在1925-1950年,1950-1980年和1980-2008年間表現為弱、強、弱的趨勢,與太平洋年代際振蕩(Pacific Decadal oscillator,PDO)年際變化趨勢一致;推測厄爾尼諾-南方濤動(El Niño-Southern Oscillation,ENSO)在短時間尺度上可能對上升流強度有一定調節作用,但長時間尺度上可能主要受PDO調節作用。
    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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