| 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 |
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| 引用本文： | 白莹,苏荣国,韩秀荣,张传松,石晓勇.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[J].海洋学报(英文版),2015,34(10):1-12. |
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| 作者姓名： | 白莹 苏荣国 韩秀荣 张传松 石晓勇 |
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| 作者单位： | 中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室, 中国青岛, 266100,中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室, 中国青岛, 266100,中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室, 中国青岛, 266100,中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室, 中国青岛, 266100,中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室, 中国青岛, 266100 |
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| 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. |
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| 摘 要： | 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 by123%–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.
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| 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 |
| 收稿时间： | 9/2/2014 12:00:00 AM |
| 修稿时间： | 2014/12/9 0:00:00 |
Investigation of seasonal variability of CDOM fluorescence in the southern Changjiang River Estuary by EEM-PARAFAC |
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| BAI Ying,SU Rongguo,HAN Xiurong,ZHANG Chuansong and SHI Xiaoyong.Investigation of seasonal variability of CDOM fluorescence in the southern Changjiang River Estuary by EEM-PARAFAC[J].Acta Oceanologica Sinica,2015,34(10):1-12. |
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| Authors: | BAI Ying SU Rongguo HAN Xiurong ZHANG Chuansong and SHI Xiaoyong |
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| Institution: | 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. |
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| Keywords: | southern Changjiang River Estuary chromophoric dissolved organic matter fluorescence excitation emission matrix spectroscopy parallel factor analysis humification index fluorescence index |
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