黄河口近岸海域有色溶解有机质的时空分布及光降解特性  

Spatial-temporal distribution and photodegradation of chromophoric dissolved organic matter in the coastal waters of the Yellow River Estuary

作　　者：薛飞扬 秦华伟 李凤超 王友华 张明政 王新科 马浩阳 马元庆 梁生康[1,2] XUE Feiyang;QIN Huawei;LI Fengchao;WANG Youhua;ZHANG Mingzheng;WANG Xinke;MA Haoyang;MA Yuanqing;LIANG Shengkang(College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao,266100,China;Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao,266100,China;Shandong Marine Resources and Environment Research Institute,Yantai,264000,China;Shandong Weifang Ecological Environment Monitoring Center,Weifang,261000,China)

机构地区：[1]中国海洋大学化学化工学院,青岛266100 [2]中国海洋大学海洋化学理论与工程技术教育部重点实验室,青岛266100 [3]山东省海洋资源与环境研究院,烟台264000 [4]山东省潍坊生态环境监测中心,潍坊261000

出　　处：《环境化学》2023年第3期904-917,共14页Environmental Chemistry

基　　金：国家重点研发计划项目(2018YFC1407600);山东省重大科技创新工程(2019JZZY020705);中央高校基本科研业务费专项资金(202042008);山东省重大科技创新工程(2021CXGC010705)资助.

摘　　要：根据2018年10月(秋季)、2019年5月(春季)、2019年8月(夏季)和2021年3月(冬季)在黄河口开展的溶解有机质(DOM)及其光学性质特征参数的陆海同步观测数据,结合同步开展的不同来源DOM的光降解船基现场培养试验,分析黄河口DOM及有色溶解有机质(CDOM)的时空分布特征,探讨该海域不同来源DOM光降解作用及控制机制.结果表明,黄河入海径流的溶解有机碳(DOC)和CDOM浓度呈现夏季高、冬季次之、春季和秋季低的变化特征;DOC和CDOM入海通量呈现夏季最高、秋季和春季次之、冬季最低的季节特征,主要受黄河流域汛期及调水调沙作用影响;黄河口DOC呈现不规则斑块状分布,CDOM呈现近岸高、离岸低的分布特征,为黄河输入、海源自生及光降解等多种因素影响所致.在黄河径流较大的夏季,DOC受陆源输入影响较其他季节更为明显,CDOM浓度明显高于其他季节;夏季DOC与CDOM之间的线性关系也显著高于其他季节.春季、夏季和秋季陆源DOM光化学降解速率均高于海源;受DOM来源组成和温度、光照等环境因子共同作用,研究海域夏季CDOM光降解率高于春、秋两季.According to the land-sea synchronous observation data of dissolved organic matter(DOM)and its optical property characteristic parameters in October 2018(autumn),May 2019(spring),August 2019(summer),and March 2021(winter)in the Yellow River Estuary,and in combination with the simultaneous boat-based culture experiments of different sources of DOM,we analyzed the spatio-temporal distribution characteristics of DOM and chromophoric dissolved organic matter(CDOM)in the Yellow River Estuary,and investigated the effects and control mechanisms of different sources of DOM after photodegradation.The results showed that the concentrations of dissolved organic carbon(DOC)and CDOM in the Yellow River estuary were higher in summer,followed by winter,and lower in spring and autumn.The fluxes of DOC and CDOM to the sea were the highest in summer,followed by autumn and spring,and the lowest in winter,which were mainly influenced by the flood season and water and sediment regulation of the Yellow River basin.The concentration of DOC in the Yellow River estuary showed an irregular patchy distribution,and the concentration of CDOM showed a distribution characteristic of high near shore and low off shore,which was caused by many factors such as the input of the Yellow River,marine autogenesis and photodegradation.In summer,when the runoff of the Yellow River was large,DOC was more affected by terrestrial input than other seasons,and the concentration of CDOM is significantly higher than other seasons.The linear relationship between DOC and CDOM in summer was also significantly higher than that in other seasons.The photochemical degradation rate of terrestrial DOM in spring,summer and autumn is higher than that of marine DOM.The photodegradation rate of CDOM in summer was higher than that in spring and autumn due to the combination of DOM source composition,temperature,light and other environmental factors.

关 键 词：陆源溶解有机质 海源溶解有机质 有色溶解有机质 光降解 黄河口 

分 类 号：X55[环境科学与工程—环境工程]