| 摘要: |
| 采用三维荧光对珠江口磨刀门夏秋季有色溶解有机物(CDOM)时空变化进行研究, 分析其组成及荧光强度。结果表明, CDOM 三维荧光峰谱包括UV 类腐殖质A、陆源Vis 类腐殖质C 和海源Vis类腐殖质M, 以及类蛋白质T。在入海过程中, 其组成未发生变化, 但其荧光强度随盐度增加逐渐减小,反映了CDOM 主要来源是陆源, 并且主要受海水物理稀释控制, 是一种典型的保守混合行为。在定点站位涨落潮周期中, CDOM 的荧光强度不仅受到海水稀释的作用, 表层水体CDOM 受到紫外线的光降解作用, 同时中层水体CDOM 受到浮游植物的影响, 反映了盐度、紫外线强度、生物活动对CDOM 具有的共同影响。 |
| 关键词: 三维荧光光谱 T 峰 荧光强度 温度 盐度 紫外线 |
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| 基金项目:国家自然科学基金与广东省联合基金项目(U0933005); 国家自然科学基金项目(41203015); 国家重点基础研究计划“973”课题(2010CB951201) |
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| The fluorescence excitation emission matrix spectroscopy of CDOM in Modaomen Estuary of the Pearl River |
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| Abstract: |
| The composition and fluorescence intensity of CDOM at Modaomen Estuary of the Pearl River were analyzed with EEMs method in summer-autumn, 2011. The results indicated that EEMs include UV humic-like A, visible-terrestrial humic-like C, visible-marine humic-like M, and tryptophan-like T. During the CDOM transporting into the sea, the fluorescence intensity of CDOM decreased with increased salinity but its composition little changed, reflecting the major source of CDOM resulted from terrestrial and its fluorescence intensity controlled byphysical dilution which is a typical conservative mixing behavior. During the period of flooding and ebbing at fixed observation station, the fluorescence intensity of CDOM was not only controlled by physical dilution of seawater, but also controlled by UV light in surface water and more controlled by phytoplankton in middle-level water, suggesting that the characteristics of CDOM were affected by salinity, UV light and bio-activities together. |
| Key words: EEMs T peak fluorescence intensity temperature salinity UV |
