西太平洋秋季130°E断面有色溶解有机物的分布特征及光降解行为研究

刘可; 杨琳; 杨桂朋; 张婧

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刘可,杨琳,杨桂朋,张婧.西太平洋秋季130°E断面有色溶解有机物的分布特征及光降解行为研究[J].海洋学报,2020,42(10):121-131

西太平洋秋季130°E断面有色溶解有机物的分布特征及光降解行为研究

Distribution and photodegradation behavior of CDOM along 130°E in the western Pacific Ocean

投稿时间：2019-10-12 修订日期：2020-01-08

DOI：10.3969/j.issn.0253-4193.2020.10.012

中文关键词: CDOM 上层水体吸收光谱荧光光谱光降解西太平洋

英文关键词:chromophoric dissolved organic matter (CDOM) upper water absorption coefficient fluorescence spectrum photodegradation western Pacific Ocean

基金项目:国家自然科学基金（41806093）。

作者	单位	E-mail
刘可	中国海洋大学化学化工学院，山东青岛 266100 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，山东青岛 266100
杨琳	中国海洋大学化学化工学院，山东青岛 266100 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，山东青岛 266100
杨桂朋	中国海洋大学化学化工学院，山东青岛 266100 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，山东青岛 266100
张婧	中国海洋大学化学化工学院，山东青岛 266100 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，山东青岛 266100	zhangjouc@ouc.edu.cn

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中文摘要:

对2018年秋季西太平洋130°E断面上层水体有色溶解有机物(CDOM)的光学特性及光降解行为进行了研究。结果表明，西太平洋上层水体CDOM的吸收系数a(320)变化范围为0.025～0.64 m^-1，平均值为(0.20±0.08) m^-1；a(320)在表层相对较低，主要与表层CDOM的光漂白去除有关；在100～200 m水层较高，主要与次表层的生物活动有关。利用三维荧光光谱-平行因子分析技术，识别出两种荧光组分：类酪氨酸组分C1和海洋类腐殖质组分C2。C1主要源于棉兰老冷涡-上升流所带来的营养物质对浮游植物生产活动和微生物活动的促进作用；C2主要源于黑潮所带来的海洋类腐殖的输入。光化学降解实验发现，CDOM吸收值的损失主要发生在紫外波段；光照60 h后，类酪氨酸组分相较于海洋类腐殖质组分更易发生光降解；且光降解是西太平洋海域CDOM的重要去除途径。

英文摘要:

Photochemical properties and photochemical degradation of chromophoric dissolved organic matter (CDOM) were investigated in the upper water of the western Pacific Ocean during the autumn in 2018. The results showed that the absorption coefficient a(320) of CDOM ranged from 0.025 m^-1 to 0.64 m^-1, with an average of (0.20 ±0.08) m^-1. The a(320) showed relatively lower values in the surface water, which was mainly related to the photobleaching removal of the surface CDOM. The higher values of a(320) were observed in the 100-200 m water layers, which was mainly related to the biological production in the subsurface layer. The tyrosine-like component C1 and the marine humic-like component C2 were identified by FDOM excitation/emission matrix spectroscopy and a parallel factor analysis. The production of C1 was mainly originated from the production of phytoplankton and the degradation of microorganisms, while C2 was mainly originated from the input of the marine humic brought by Kuroshio. Moreover, the absorption loss spectra of CDOM indicated that the UV radiation was responsible for the photodegradation of CDOM. The tyrosine-like component was more susceptible to photodegradation than the marine humic-like component. The results also indicated that photodegradation was the important removal route of CDOM in the western Pacific Ocean.

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