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BAI Ying,SU Rongguo,HAN Xiurong,ZHANG Chuansong,SHI Xiaoyong. 2015. Investigation of seasonal variability of CDOM fluorescence in the southern Changjiang River Estuary by EEM-PARAFAC. Acta Oceanologica Sinica, 34(10):1-12
Investigation of seasonal variability of CDOM fluorescence in the southern Changjiang River Estuary by EEM-PARAFAC
用三维荧光光谱-平行因子分析法研究长江口南部有色溶解有机物荧光的季节变化
Received:September 02, 2014  Revised:December 09, 2014
DOI:10.1007/s13131-015-0714-8
Key words:southern Changjiang River Estuary  chromophoric dissolved organic matter  fluorescence excitation emission matrix spectroscopy  parallel factor analysis  humification index  fluorescence index
中文关键词:  长江口南部  有色溶解有机物  荧光激发发射光谱  平行因子分析法  腐殖化指数  荧光指数
基金项目:The National Natural Science Foundation of China under contract No. 41376106; the Major Science and Technology Program for Water Pollution Control and Treatment under contract No. 2012ZX07501.
Author NameAffiliationE-mail
BAI Ying Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education, Ocean University of China, Qingdao 266100, China  
SU Rongguo Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education, Ocean University of China, Qingdao 266100, China surongguo@ouc.edu.cn 
HAN Xiurong Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education, Ocean University of China, Qingdao 266100, China  
ZHANG Chuansong Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education, Ocean University of China, Qingdao 266100, China  
SHI Xiaoyong Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education, Ocean University of China, Qingdao 266100, China  
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Abstract:
      The southern Changjiang River Estuary has attracted considerable attention from marine scientists because it is a highly biologically active area and is biogeochemically significant. Moreover, land-ocean interactions strongly impact the estuary, and harmful algal blooms (HABs) frequently occur in the area. In October 2010 and May 2011, water samples of chromophoric dissolved organic matter (CDOM) were collected from the southern Changjiang River Estuary. Parallel factor analysis (PARAFAC) was used to assess the samples' CDOM composition using excitation-emission matrix (EEM) spectroscopy. Four components were identified: three were humic-like (C1, C2 and C3) and one was protein-like (C4). Analysis based on spatial and seasonal distributions, as well as relationships with salinity, Chl a and apparent oxygen utilization (AOU), revealed that terrestrial inputs had the most significant effect on the three humic-like Components C1, C2 and C3 in autumn. In spring, microbial processes and phytoplankton blooms were also important factors that impacted the three components. The protein-like Component C4 had autochthonous and allochthonous origins and likely represented a biologically labile component. CDOM in the southern Changjiang River Estuary was mostly affected by terrestrial inputs. Microbial processes and phytoplankton blooms were also important sources of CDOM, especially in spring. The fluorescence intensities of the four components were significantly higher in spring than in autumn. On average, C1, C2, C3, C4 and the total fluorescence intensity (TFI) in the surface, middle and bottom layers increased by 123%-242%, 105%-195%, 167%-665%, 483%-567% and 184%-245% in spring than in autumn, respectively. This finding corresponded with a Chl a concentration that was 16-20 times higher in spring than in autumn and an AOU that was two to four times lower in spring than in autumn. The humification index (HIX) was lower in spring that in autumn, and the fluorescence index (FI) was higher in spring than in autumn. This result indicated that the CDOM was labile and the biological activity was intense in spring.
中文摘要:
      长江口南部是高生物活动的区域并具有重要的生物地球化学作用。此外,强烈的陆海活动影响着这个区域,赤潮也在此频繁发生。因此它吸引了很多海洋学家的关注。在2010年10月和2011年5月,有色溶解有机物的水样取自长江口的南部。三维荧光光谱-平行因子分析法被用来分析水样中有色溶解有机物的组分。分析出了4种组分:3种类腐殖质(C1,C2和C3)和1种类蛋白质(C4)。通过分析荧光组分的时空分布,与盐度、叶绿素a和表观耗氧量的关系,可以得出陆源输入对秋季组分C1,C2和C3有最重要的影响。在春季,微生物活动和浮游植物增值也是这三种组分的重要影响因素。C4受海陆源的共同影响并代表了生物易降解的组分。长江口南部的有色溶解有机物主要受陆源输入的影响,微生物活动和浮游植物增值也是这个区域有色溶解有机物的重要来源,尤其是在春季。4种组分春季的荧光强度都高于秋季。C1,C2, C3, C4 和总荧光强度在春季比秋季分别增加了123-242%, 105-195%, 167-665%, 483-567% 和 184-245%。这正好与春季叶绿素a的浓度比秋季高了16-20倍,表观耗氧量减小了2-4倍相吻合。春季的腐殖化指数比秋季低,荧光指数比秋季高。这表明春季的有色溶解有机物不稳定并且生物活动较活跃。
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