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余 果, 付东洋, 刘大召, 刘 贝, 廖 珊, 王立安, 张小龙.富营养化湛江港湾有色溶解有机物光学特性的时空变化分析水资源与水工程学报[J].,2018,29(6):100-105
富营养化湛江港湾有色溶解有机物光学特性的时空变化分析
Spatial and temporal variation of optical properties of colored dissolved organic matter in eutrophic Zhanjiang Harbor
  
DOI:10.11705/j.issn.1672-643X.2018.06.15
中文关键词:  有色溶解有机物  吸收系数  光谱斜率  时空变化  湛江港湾
英文关键词:colored dissolved organic matter  absorption coefficient  spectral slope  spatial and temporal variation  Zhanjiang Harbor
基金项目:国家海洋公益专项(201305019); 广东省自然科学基金项目(2014A030313603); 广东省科技计划项目(2013B030200002、2016A020222016); 广东海洋大学创新强校项目(GDOU2014050226); 广东海洋大学大学生创新创业训练计划项目(CXXL2017026); “海之帆”起航计划大学生科技创新培育项目(qhjh2017zr15); 广东省哲学社会科学规划项目( GD12YGL04); 广东省普通高校优秀青年创新人才培养计划项目( 2012WYM_0077); 广东海洋大学博士科研启动项目(E11097)
作者单位
余 果1,2, 付东洋1, 刘大召1, 刘 贝1, 廖 珊1, 王立安1, 张小龙1,2 (1.广东海洋大学 电子与信息工程学院 广东 湛江 524088 2.广东海洋大学海洋与气象学院 广东 湛江 524088) 
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中文摘要:
      有色溶解有机物(CDOM)是海洋水色遥感三要素之一,近海二类水体CDOM的遥感监测一直是国内外研究的热点和难点。基于2016-2017年湛江港湾两个航次的调查资料,探讨了湛江湾水体中CDOM光学特性的时空变化特征及溯源问题。结果表明:在季节变化方面,港湾内表层水体CDOM吸收系数ag(355)和光谱斜率S275~295呈现出秋季>夏季的变化特征。在空间分布方面,夏季港湾内表层和底层的ag(355)则基本呈现由北向南、由西向东递减的趋势,表层和底层CDOM光谱斜率S275~295在水平空间上大致呈现斑块状的分布;同时,湾内叶绿素a浓度和浊度均较高,叶绿素a浓度在1~5 μg/L之间变化,浊度的范围是5~70 NTU,溶解氧的浓度较小,在3~5 ml/L之间变化。对CDOM吸收系数ag(355)与光谱斜率、叶绿素a、溶解氧、浊度的关系深入分析发现,夏季和秋季水体中CDOM来源主要有浮游植物现场生产和陆源所携带,同时底层沉积物的再悬浮也是秋季水体中CDOM来源之一。两个季节CDOM浓度与DO负相关性较好,表明它对水体的污染和富营养化具有一定的指示作用。
英文摘要:
      The colored dissolved organic matter (CDOM) is one of the three elements of ocean color remote sensing, and remote sensing monitoring of CDOM of the case-Ⅱ coastal water has always been a hot but difficult topic in the world. Based on the survey data of the two voyages in Zhanjiang harbor from 2016 to 2017, the spatial-temporal characteristics of the optical properties and the source of CDOM in the waters of Zhanjiang bay were discussed. The results showed that: In terms of seasonal changes, it manifest that CDOM absorption coefficient (ag(355)) and spectral slope (S275~295) in the surface waters of the harbor in autumn were greater than that in summer. In terms of spatial distribution, the ag(355) of the thalassic surface and bottom layers of summer basically showed a decrease trend from the north to the south and from the west to the east, meanwhile the S275~295 presented a patchy distribution in the horizontal space generally. Moreover, chlorophyll a concentration and turbidity were relatively high with a variation range from 1μg/L to 5 μg/L of chlorophyll a concentration and a range from 5 NTU to 70 NTU of turbidity. For another, dissolved oxygen concentration is relatively low which ranges from 3 ml/L to 5 ml/L in the bay. According to the comprehensive analysis of CDOM absorption coefficient, spectral slope, chlorophyll a, dissolved oxygen and turbidity, we can draw a conclusion that the CDOM in the Zhanjiang bay waters mainly comes from terrestrial input and phytoplankton on-site production in the summer and autumn, the sediments resuspension has a certain contribution to the source of colored dissolved organic matter in the autumn. Furthermore, the concentration of colored dissolved organic matter was negatively correlated with DO in the two seasons accompanying a certain indication function for water pollution and eutrophication.
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