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

作　　者：余果 付东洋[1] 刘大召 刘贝 廖珊 王立安 张小龙 YU Guo;FU Dongyang;LIU Dazhao;LIU Bei;LIAO Shan;WANG Li-an;ZHANG Xiaolong(School of Electronic and Information Engineering,Guangdong Ocean University,Zhanjiang 524088,China;College of Oceanography and Meteorology,Guangdong Ocean University,Zhanjiang 524088,China)

机构地区：[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

出　　处：《水资源与水工程学报》2018年第6期100-105,121,共7页Journal of Water Resources and Water Engineering

基　　金：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);广东海洋大学博士科研启动项目(E11097);“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)

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1~5μg/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。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-Ⅱcoastal water has always been a hot but difficult topic in the world.Based on the survey data of the two voyages in Zhanjiang harbor from2016 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 5μg/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,spectralslope,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.

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 

分 类 号：P733.3[天文地球—物理海洋学]