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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.
Fluorescence composition and distribution characteristics of CDOM in the spring (March 2015) and summer (July 2015) of the Yangtze Estuary and adjacent waters were analyzed by using three-dimensional fluorescence spectroscopy (EEMs) -parallel factor (PARAFAC) .It is found that there are two types of four fluorescent components, that is, the humic component C1 (370/495 nm), C2 (330/405 nm), C3 (365/440 nm) and the quasi protein component C4 (295/345 nm ) .The distribution patterns of the four fluorescent components in spring and summer were basically the same, and gradually decreased from the Yangtze River Estuary to the adjacent waters.The high value area of spring humus component was located in the Changjiang Estuary, while the high value area of the proteinaceous component was located in the south channel In the nearby area, the surface CDOM mainly comes from land-source inputs and human activities; the middle layer fluorescence intensity value is lower than the surface layer, and the terrestrial fluorescence intensity is weakened; the bottom fluorescence intensity value is slightly higher than the middle layer, which is caused by sediment resuspension. There is a high value in the sea near Daishan County, which is related to the activity of residents in the island.The high value region of summer fluorescent component is similar to that of spring, and the fluorescence components of each layer are close, which indicates that the water body in the study area in summer is more evenly mixed. Summer humification index (HIX) in the Yangtze Estuary higher, while the biological means (BIX) was higher in the adjacent sea area. Four fluorescence components (C1 ~ C4), absorption coefficient (a355) and salinity (S), dissolved organic carbon (DOC), total nitrogen (TN) TP, Chl-a and DO were analyzed.The results showed that the four fluorescence components (C1-C4), total nitrogen (TN) and total phosphorus (TP) , Human activities and dissolved organic carbon (DOC) are affected by both terrigenous and marine sources.This paper analyzes the composition of CDOM by using three-dimensional fluorescence spectroscopy-parallel factor analysis (EEMs-PARAFAC) combined with multivariate statistical methods, The source and main influencing factors of CDOM in the adjacent sea area may provide a useful supplement for the study of marine biogeochemistry of biogenic elements in estuarine area.