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

doi:10.3969/j.issn.0253-4193.2020.10.012

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

doi: 10.3969/j.issn.0253-4193.2020.10.012

刘可^{1, 2,},
杨琳^{1, 2},
杨桂朋^{1, 2},
张婧^{1, 2, ,}

1.
中国海洋大学化学化工学院，山东青岛 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，山东青岛 266100

基金项目: 国家自然科学基金（41806093）。

详细信息

作者简介:
刘可（1994-），女，河南省驻马店市人，主要研究方向为海洋化学。E-mail: liuke131001016@163.com

通讯作者:
张婧，女，副教授，主要从事海洋中溶解有机物的研究。E-mail: zhangjouc@ouc.edu.cn

中图分类号: P714⁺.4；P734.2⁺1
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- 被引次数: 0
出版历程
- 收稿日期: 2019-10-12
- 修回日期: 2020-01-08
- 网络出版日期: 2020-11-13
- 刊出日期: 2020-10-25

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

Liu Ke^{1, 2
,},
Yang Lin^{1, 2},
Yang Guipeng^{1, 2},
Zhang Jing^{1, 2
, ,}

1.
College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
2.
Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education, Ocean University of China, Qingdao 266100, China

摘要

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。
- CDOM /
- 上层水体 /
- 吸收光谱 /
- 荧光光谱 /
- 光降解 /
- 西太平洋
Abstract: 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.
- chromophoric dissolved organic matter (CDOM) /
- upper water /
- absorption coefficient /
- fluorescence spectrum /
- photodegradation /
- western Pacific Ocean

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图 1 西太平洋秋季调查站位及主要环流

Fig. 1 Sampling stations and the main currents in the western Pacific Ocean

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图 2 西太平洋上层水体温度、盐度、a(320)、Chl a浓度、S_275-295、DO浓度的分布

Fig. 2 Distribution of temperature, salinity, a(320), Chl a concentration, S_275-295, DO concentration in the upper waters of the western Pacific Ocean

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图 3 西太平洋上层水体中C1和C2荧光强度的分布

Fig. 3 Distribution of C1 and C2 fluorescence intensity in the upper waters of the western Pacific Ocean

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图 4 a(320)和S_275-295在E130-30站位随光照时间的变化曲线

Fig. 4 Variation curve of a(320) and S_275-295 at the E130-30 during irradiation time

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图 5 CDOM的特征吸收光谱（a）和吸收损失光谱（b）的变化曲线

Fig. 5 Variation curve of characteristic absorption spectrum (a) and absorption loss spectrum (b) of CDOM

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图 6 C1和C2荧光组分的光降解曲线

Fig. 6 Photodegradation curves of C1 and C2 fluorescent components

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表 2 西太平洋上层水体a(320)和荧光组分与温度、盐度、DO浓度、Chl a浓度、营养盐的相关性分析

Tab. 2 Correlation analysis of a(320) and fluorescent components with temperature, salinity, DO concentration, Chl a concentration, and nutrients in the upper waters of the western Pacific Ocean

	温度	盐度	DO	Chl a	${\rm {NO}}_3^- $-N	${\rm {NH}}_4^+ $-N	${\rm {PO}}_4^{3-} $	${\rm {SiO}}_3^{2-} $
a(320)	−0.557^**	0.378^**	−0.451^**	−0.071	0.482^**	0.018	0.457^**	0.389^**
C1	−0.178	0.056	−0.189	−0.021	0.430^**	0.312^*	0.236	0.287^*
C2	−0.031	0.197	0.059	0.023	−0.205	−0.190	−0.128	−0.198
注：^表示显著相关（p<0.05），^*表示极显著相关（p<0.01）。

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表 1 西太平洋上层水体FDOM的主要荧光组分

Tab. 1 Principle fluorescent component of FDOM in the upper waters of the western Pacific Ocean

组分	最大激发/发射波长	荧光组分类型	相似荧光峰和参考文献
C1	270(225)/310	类酪氨酸（B）	B: 275 nm/310 nm^[29]
			B: (265～280 nm)/(293～313 nm)^[30]
			B1: (225～237 nm)/(309～321 nm)^[31]
			B2: 275 nm/310 nm^[31]
C2	290/410	海洋类腐殖质（M）	M: (290～310 nm)/(370～410 nm)^[29]
			C4: 290 nm/405 nm^[32]
			C2: 235(300) nm/404 nm^[33]

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