| 渤海和北黄海有色溶解有机物(CDOM)的分布特征和季节变化 |
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| 引用本文： | 刘兆冰,梁文健,秦礼萍,唐建辉.渤海和北黄海有色溶解有机物(CDOM)的分布特征和季节变化[J].环境科学,2019,40(3):1198-1208. |
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| 作者姓名： | 刘兆冰 梁文健 秦礼萍 唐建辉 |
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| 作者单位： | 山东科技大学地球科学与工程学院,青岛266590;中国科学院烟台海岸带研究所,中国科学院海岸带环境过程与生态修复重点实验室,烟台264003;中国科学院烟台海岸带研究所,中国科学院海岸带环境过程与生态修复重点实验室,烟台264003;中国科学技术大学地球和空间科学学院,合肥230026;中国科学技术大学地球和空间科学学院,合肥,230026;中国科学院烟台海岸带研究所,中国科学院海岸带环境过程与生态修复重点实验室,烟台264003 |
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| 基金项目： | 中国科学院战略性先导科技专项（XDA11020401）；国家自然科学基金项目（41773138） |
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| 摘 要： | 采集了2016年的4、8、12月和2017年2月渤海和北黄海表、中、底海水样品,分析了海水中有色溶解有机物(CDOM)的紫外-可见光吸收光谱和三维荧光光谱,探讨了渤海和北黄海海域CDOM的分布特征、影响因素和季节变化.结果表明,不同季节CDOM分布相似,呈近岸高、远海低的分布特征.吸收系数a(355)和光谱斜率S275-295呈显著负相关,说明CDOM受到陆源输入的显著影响.垂直分布上,8月,受强烈的光降解作用影响,表层CDOM含量最低. 2月,底层CDOM含量最低,这可能与受光照影响的初级生产力在水下分布不均匀有关.从2016年4月～2017年2月,CDOM含量先上升后下降,12月含量最高,2月含量最低. CDOM的季节变化主要受陆源输入和浮游植物生物量的季节变化控制.以光谱斜率S275-295表征CDOM的平均分子量,2月由于陆源输入最少,CDOM平均分子量最小.夏季光降解强烈,将部分大分子量有机物降解成小分子量有机物,小分子量有机物增加,因此,8月CDOM的平均分子量小于4月和12月.
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| 关 键 词： | 有色溶解有机物(CDOM) 紫外-可见光吸收光谱 三维荧光光谱(EEM) 平行因子分析 分布特征 季节变化 渤海和北黄海 |
| 收稿时间： | 2018/5/14 0:00:00 |
| 修稿时间： | 2018/9/12 0:00:00 |
Distribution and Seasonal Variations of Chromophoric Dissolved Organic Matter(CDOM) in the Bohai Sea and the North Yellow Sea |
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| LIU Zhao-bing,LIANG Wen-jian,QIN Li-ping and TANG Jian-hui.Distribution and Seasonal Variations of Chromophoric Dissolved Organic Matter(CDOM) in the Bohai Sea and the North Yellow Sea[J].Chinese Journal of Environmental Science,2019,40(3):1198-1208. |
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| Authors: | LIU Zhao-bing LIANG Wen-jian QIN Li-ping and TANG Jian-hui |
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| Institution: | College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China,Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China,School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China and Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China |
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| Abstract: | UV-Vis spectral data and a fluorescence excitation-emission matrix (EEM) was analyzed for the surface, middle, and bottom layer water samples from the Bohai Sea and North Yellow Sea in April, August, and December of 2016 and February of 2017. Distribution characteristics, influencing factors, and seasonal variation of CDOM in the study area were investigated. The results showed that the horizontal distributions of CDOM are similar in different seasons, showing a characteristic of high levels near shore and low levels in the offshore region. Strong correlations were observed between value a (355) and spectral slope S275-295, indicating that CDOM is significantly affected by land input. According to the vertical distribution, the CDOM level is the lowest in surface seawater in summer due to strong photo-degradation. In February, controlled by primary productivity, the lowest level of CDOM was found in the bottom seawater. From April 2016 to February 2017, the content of CDOM first increased and then decreased. Its concentration was highest in December. Seasonal variations are mainly controlled by land input and on-site production. According to analysis of the spectral slope S275-295, the average molecular weight of CDOM in winter was smallest in February, which was mainly related to the drastic reduction of land-based input at that time. The strong photo-degradation in summer resulted in a small average molecular weight of CDOM. |
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| Keywords: | chromophoric dissolved organic matter (CDOM) UV-Vis spectral excitation-emission matrix (EEM) parallel factor analysis distribution seasonal variations Bohai Sea and North Yellow Sea |
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