黄东海水体及沉积物中有色溶解有机物的研究

发布时间：2018-11-11 01:26

【摘要】：三维荧光光谱结合平行因子分析法(EEMs-PARAFAC)是目前研究海洋有色溶解有机物(CDOM)的最有效手段之一,本文利用此方法对黄东海海域水体及沉积物中的CDOM进行了研究,同时结合季节特点和温盐情况,分析了它们的组分构成,来源,分布情况等特点。(1)春季北黄海海域的海水样品通过平行因子分析最终得到了4个荧光组分:类腐殖荧光组分C1(260,315/425)和C2(295,355/490)、类蛋白荧光组分C3(275/310)和C4(230,290/345)。4种组分在来源或者结构上都有一定的联系,且同类型的荧光组分间,来源更为相近。总荧光强度及四组分的荧光强度在水平和垂直方向上总体都呈现近岸高,远海降低的趋势,结合荧光指数来看,总体上显示出近岸受陆源输入影响较大,而离岸较远区域海洋生源特征更加明显的特点。(2)PARAFAC模型对冬季黄东海海水样品分析后,得到了4个组分:类腐殖质荧光组分C1(260,310/415nm)、C3(295,360/500),类蛋白荧光组分C1(280,335)和C4(270/310)。同类型的组分间分别具有较高的相似性说明同类型组分的来源和结构更相近。总荧光强度和四组分的水平和垂直分布体现了CDOM既受到陆源输入的影响,又受到沿岸流系,以及海洋水团运动的共同作用。HIX和BIX的分布呈现反变关系,说明沿岸区域CDOM腐殖化程度更高,而向海一侧,CDOM腐殖化程度降低且有更多的海洋自生源产出。(3)冬季黄海的沉积物样品在分离间隙水,提取水萃有机物和碱萃有机物之后,与对应站位的底层水样品分别建立了4个PARAFAC模型。对底层水的CDOM,以及沉积物的PDOM,WEOM和AEOM进行分析,得到的各组分波长有红移的趋势,且类腐殖化特征逐渐增强的特点。同一模型得到的相同属性的组分间来源相近,而不同模型得到的类色氨酸组分之间没有显著相关性,说明底层水有机物与PDOM之间的非耦合性。沉积物有机物SOM与沉积物水萃有机物WEOM之间呈现一定程度的相关性。底层水,PDOM,WEOM和AEOM之间的HIX和BIX的差异体现了其中有机物的腐殖化程度的不同和“新旧”差异。
[Abstract]:Three-dimensional fluorescence spectroscopy combined with parallel factor analysis (EEMs-PARAFAC) is one of the most effective methods to study the (CDOM) of marine chromically dissolved organic matter. In this paper, the CDOM in the waters and sediments of the East China Sea and the Yellow Sea are studied by using this method. At the same time, according to the seasonal characteristics and the temperature and salt conditions, the composition and source of their components are analyzed. (1) through parallel factor analysis, four fluorescent components, C1 (260315 / 425) and C2 (295355 / 490), were obtained from the sea water samples in the North Huang Hai sea area in the spring, and the fluorescence components C1 (260315 / 425) and C2 (295355r / 490) were obtained by parallel factor analysis. The fluorescent components C3 (275 / 310) and C4 (230290 / 345) have some relationship in source or structure, and the same fluorescent components are more similar in origin. The total fluorescence intensity and the fluorescence intensity of the four components in the horizontal and vertical directions all showed a trend of high near shore and decreasing in the far sea. In combination with the fluorescence index, it was shown that the near shore was greatly affected by the land source input. However, the characteristics of marine biogenicity in distant offshore regions are more obvious. (2) after analyzing the samples of the East China Sea in winter by PARAFAC model, four components were obtained: C _ 1 (260310/415nm), C _ 3 (295,360 / 500), and C _ 1 (C _ 1), C _ 3 (C _ 3), C _ 3 (295,360 / 500), C _ 1 and C _ 3, respectively. The fluorescent components C1 (280335) and C4 (270 / 310) of protein-like proteins. The higher similarity between the same types of components indicates that the origin and structure of the same types of components are more similar. The total fluorescence intensity and the horizontal and vertical distribution of the four components show that CDOM is affected by both the terrestrial input and the coastal current system, as well as the ocean water mass movement. The distribution of HIX and BIX is inversely related. The results showed that the degree of CDOM humification was higher in the coastal area, but the degree of CDOM humification was lower and more marine autogenetic production was found on the seaward sea side. (3) the sediment samples of Huang Hai in winter were separated from interstitial water. After extracting organic matter in water and extracting organic substance in alkali, four PARAFAC models were established with the bottom water sample of corresponding station. By analyzing the CDOM, of the bottom water and the PDOM,WEOM and AEOM of the sediment, the wavelength of each component has the tendency of redshift, and the characteristic of humification is gradually enhanced. The sources of the same properties of the components obtained from the same model are similar, but there is no significant correlation between the tryptophan components obtained from the different models, which indicates the decoupling between organic compounds in the bottom water and PDOM. There is a certain correlation between sediment organic matter (SOM) and sediment water extraction organic matter (WEOM). The difference of HIX and BIX between bottom water, PDOM,WEOM and AEOM reflects the difference of humification degree and "new and old" of organic matter.
【学位授予单位】：中国科学院研究生院(海洋研究所)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P734

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