长江口及邻近海域春夏季有色溶解有机物时空分布特征及主要影响因素

发布时间：2018-02-25 05:08

本文关键词： 有色溶解有机物三维荧光光谱平行因子分析冗余分析长江口　出处：《环境科学》2017年05期 　论文类型：期刊论文

【摘要】：利用三维荧光光谱(EEMs)-平行因子(PARAFAC)分析技术对长江口及邻近海域春季(2015年3月)和夏季(2015年7月)有色溶解有机物(CDOM)的荧光组成及分布特征进行分析.共识别出2类4个荧光组分,即类腐殖质组分C1(370/495nm)、C2(330/405 nm)、C3(365/440 nm)及类蛋白质组分C4(295/345 nm).春夏季各层4个荧光组分分布模式基本一致,从长江口到邻近海域逐渐降低.春季类腐殖质组分的高值区分布在长江口内,而类蛋白组分高值区位于南槽附近区域,表层的CDOM主要来源于陆源输入和人类活动;中层荧光强度值比表层低,受陆源影响减弱;底层荧光强度值比中层略高,是由沉积物再悬浮造成的.各荧光组分在岱山县附近海域均有一个较高值,这与岛上的居民活动有关.夏季荧光组分高值区与春季相似,各层荧光组分值接近,说明夏季研究区域水体混合较均匀.春夏季腐殖化指数(HIX)在长江口较高,而生物指数(BIX)在邻近海域较高.将4个荧光组分(C1~C4)、吸收系数(a355)与盐度(S)、溶解有机碳(DOC)、总氮(TN)、总磷(TP)、叶绿素a(Chl-a)、溶解氧(DO)做冗余分析.结果表明,4个荧光组分(C1~C4)与总氮(TN)、总磷(TP)主要受陆源输入、人类活动的影响,溶解有机碳(DOC)受陆源与海源的共同影响.本文利用三维荧光光谱-平行因子分析(EEMs-PARAFAC)技术结合多元统计方法解析了CDOM组成,清晰揭示了长江口及邻近海域CDOM的来源及主要影响因子,可为河口海域生源要素海洋生物地球化学研究提供有益的补充.
[Abstract]:The fluorescence composition and distribution of CDOM in spring (March 2015) and summer (July 2015) in the Yangtze Estuary and its adjacent waters were analyzed by using three dimensional fluorescence spectra with parallel factor analysis (PARAFAC). A total of 2 2 was identified. Class 4 fluorescent components, That is, the humus-like component C _ 1 ~ (70 / 495nm ~ (-1) C _ 2o ~ (330 / 405) nm ~ (-1)) and its protein-like component C _ (4) ~ (29) / (345) nm ~ (m ~ m). The distribution pattern of four fluorescence components in each layer in spring and summer was basically the same, and gradually decreased from the Changjiang Estuary to the adjacent sea area. The high value region of humus components in spring was distributed in the Changjiang estuary. However, the high value region of protein-like components is located near the southern trough, the CDOM in the surface layer is mainly derived from terrestrial input and human activities, the fluorescence intensity in the middle layer is lower than that in the surface layer, and is weakened by the influence of the land source, and the fluorescence intensity in the bottom layer is slightly higher than that in the middle layer. Each fluorescence component has a higher value in the sea area near Daishan County, which is related to the activities of residents on the island. The high value area of the fluorescence component in summer is similar to that in spring, and the fluorescence component values of each layer are close to each other. The results show that the mixing of water bodies in summer is more homogeneous, and the humification index (HIX) is higher in the Yangtze Estuary in spring and summer. The biological index (BIX) was higher in the adjacent waters. The four fluorescent components, C1C4, absorptivity, and salinities, dissolved organic carbon (DOC), dissolved organic carbon (DOC), total nitrogen (TNN), total phosphorus (TP), chlorophyll a Chl-a (Do), dissolved oxygen (DOO) were used for redundancy analysis. The results showed that the four fluorescent fractions C1C4) and the total. Total phosphorus (TP) is mainly received from terrestrial sources. The influence of human activities, dissolved organic carbon (DOC) is affected by both terrestrial and marine sources. In this paper, the composition of CDOM was analyzed by means of three-dimensional fluorescence spectroscopic parallel factor analysis and multivariate statistical method. The source and main influencing factors of CDOM in the Changjiang Estuary and its adjacent waters are clearly revealed, which can provide a useful supplement for the study of marine life geochemistry of the biogenic elements in the estuarine area.
【作者单位】：中国海洋大学海洋化学理论与工程技术教育部重点实验室;
【基金】：国家重点研发计划项目(2016YFC1402101) 国家自然科学基金项目(41376106)
【分类号】：P734;X55

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