黄渤海海域秋季营养盐及有色溶解有机物分布特征

发布时间：2018-09-03 19:25

【摘要】：本文利用2013年11月黄渤海海域航次采集的海水样品,对该海域有色溶解有机物(CDOM)、营养盐等的组成、来源、分布特征和主要环境影响因子进行了分析研究.通过三维荧光光谱-平行因子分析法(EEMs-PARAFAC)对CDOM进行分析,共鉴别出2类4种荧光组分:类腐殖质组分C1(325/410 nm)、C2(275,370/435 nm)、C3(270,395/495 nm)和类蛋白质组分C4(290/340 nm).3种类腐殖质组分在黄渤海海域各层的平面分布均为由近岸向远岸逐渐递减.黄海表层和渤海中层类蛋白质组分荧光强度在近岸和远岸海域均出现极大值,而其在渤海表底层及黄海中底层的分布呈现由近岸到远岸逐渐降低的趋势.各层CDOM高值区主要分布在近岸海域.渤海表层溶解无机氮(DIN)和溶解有机氮(DON)浓度高于底层浓度,底层溶解无机磷(DIP)浓度高于表层浓度.渤海DIN呈现由近岸到远岸逐渐降低的趋势,DIP由曹妃甸近岸海域及中部海域的高值区向北部、东部和南部海域逐渐降低的趋势,DON则呈现由渤海中部偏南海域的高值区向四周逐渐递减的趋势.黄海底层DIN和DIP浓度高于表层,而表层DON浓度最高.黄海表中层DIN和DIP呈现由近岸到远岸逐渐降低的趋势,底层DIN和DIP则呈现由近岸到远岸逐渐增加的趋势,DON呈现由近岸到远岸逐渐降低的趋势.渤海DIN、DON和DIP的总体浓度均高于黄海.将4种荧光组分(C1~C4)、吸收系数(a_(355))、溶解有机碳(DOC)与叶绿素a(Chl-a)、盐度(S)、溶解氧(DO)、DIN、DON、DIP进行冗余分析,结果表明黄渤海各荧光组分(C1~C4)主要受陆源输入的影响,DOC受陆源与海源的共同影响,但陆源影响较大.渤海DIN受陆源输入的影响较大,而DON受海源影响较大;黄海DIN受陆源和海源共同影响,而DON主要受陆源输入影响.黄渤海DIP均受陆源和海源共同影响.
[Abstract]:In this paper, the composition, source, distribution characteristics and main environmental impact factors of (CDOM), nutrient salt in the Yellow Sea and Bohai Sea were studied by using the sea water samples collected during the voyage in November 2013. CDOM was analyzed by three dimensional fluorescence spectroscopic parallel factor analysis (EEMs-PARAFAC). Two kinds of four fluorescent components were identified: C1 (325% 410 nm) C 2 (2753 70 / 435 nm) C 3 (270395% 495 nm) and C 4 (290% 340 nm) 3. 3 the distribution of humus components in all layers of the Yellow Sea and Bohai Sea decreased gradually from the near shore to the far shore. The fluorescence intensity of Huang Hai's surface layer and middle layer of the Bohai Sea is maximum in the coastal and distant coastal waters, but its distribution in the bottom of the Bohai Sea and in the middle and bottom layer of Huang Hai gradually decreases from the near shore to the far shore. The high CDOM values of each layer are mainly distributed in the coastal waters. The concentrations of dissolved inorganic nitrogen (DIN) and dissolved organic nitrogen (DON) in the surface layer of Bohai Sea were higher than those in the bottom layer, and the concentration of dissolved inorganic phosphorus (DIP) in the bottom layer was higher than that in the surface layer. The DIN of the Bohai Sea decreased gradually from the inshore to the far shore from the high value area of Caofeidian inshore and the central sea area to the north. The decreasing trend of don in the eastern and southern sea areas shows a decreasing trend from the high value area in the south-central Bohai Sea to the surrounding area. The concentrations of DIN and DIP in Huang Hai's bottom layer were higher than those in surface layer, but DON concentration in surface layer was the highest. The DIN and DIP in the middle layer of Huang Hai's surface gradually decreased from the near shore to the far shore, while the DIN and DIP in the bottom layer gradually increased from the near shore to the far shore, and don gradually decreased from the near shore to the far shore. The total concentrations of DIN,DON and DIP in Bohai Sea were higher than those in Huang Hai. Four fluorescent components (C1~C4), absorption coefficients (a355), dissolved organic carbon (DOC) and chlorophyll a (Chl-a), salinity (S), dissolved oxygen (DO) DINDONDANDIP) were analyzed by redundancy analysis. The results showed that the C1~C4 of the Yellow Sea and Bohai Sea was mainly affected by the terrestrial inputs. But the influence of land source is great. The DIN of Bohai Sea is influenced greatly by land source input, while DON is greatly influenced by sea source, Huang Hai DIN is influenced by land source and sea source, and DON is mainly influenced by land source input. The DIP of the Yellow Sea and Bohai Sea are influenced by both land and sea sources.
【作者单位】：中国海洋大学化学化工学院;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;国家海洋局海洋减灾中心;
【基金】：国家重点研发计划项目(2016YFC1402101) 国家海洋局海洋减灾中心科研项目(2014AA060)
【分类号】：X55

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