Absorption and fluorescence of dissolved organic matter in submarine hydrothermal vents off NE Taiwan

Liyang Yang; Huasheng Hong; Weidong GuoChen-Tung Arthur ChenPei-I PanChun-Chin Feng

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Absorption and fluorescence of dissolved organic matter in submarine hydrothermal vents off NE Taiwan

机译：Absorption and fluorescence of dissolved organic matter in submarine hydrothermal vents off NE Taiwan

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The role of hydrothermal vents as either a source or a sink for chromophoric and fluorescent dissolved organic matter (CDOM and FDOM) in the oceans is unknown, since DOM absorption and fluorescence have not been reported for submarine hydrothermal vents. Water samples were collected from two shallow submarine hydrothermal vents off NE Taiwan, the white vent and the yellow vent, during two cruises in August, 2010. Absorption and excitation-emission-matrix fluorescence spectroscopy were used to characterize the optical properties of DOM from such extremely special environments. The absorption coefficients at wavelength 300 nm (a_(300)) were much higher at the white vent mouth and 1 m below it (2.52 ± 0.88 m~(-1)) than in the background (0.34 ±0.12 m~(-1)).This indicated that the white vent was a source of CDOM for seawater. Three fluorescent components were identified using parallel factor analysis: humic-like Cl, tyrosine-like C3, and C2 as a combination of tryptophan-like and marine humic-like components. Both Cl and C3 (but not C2) had their highest fluorescence intensity at the white vent mouth and 1 m below it, suggesting the role of the vent as a source for both humic-like and tyrosine-like DOM. Samples from the yellow vent mouth also had a higher a_(300) than the ambient seawater in our first cruise, but had fluorescence intensities of C(1-3) similar to the ambient seawater. Overall, the low humification index (HIX: 1.40±0.30) and the high autochthonous index (BIX: 1.27 ±0.63) indicated that the DOM likely had low humic contents and was mainly autochthoous of biological or bacterial origin in the study area. A biplot of HIX and BIX showed that DOM from the hydrothermal vents had a characteristic similar to terrestrial cave and spring waters, but was distinct from isolated humics.

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来源
《Marine chemistry》 |2012年第20期|64-71|共8页
作者
Liyang Yang; Huasheng Hong; Weidong GuoChen-Tung Arthur ChenPei-I PanChun-Chin Feng;
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作者单位

State Key Laboratory of Marine Environmental Science, College of Oceanography and Environmental Science, Xiamen University, Xiamen, Fujian 361005, PR China;

Institute of Marine Geology and Chemistry, National Sun Yat-sen University, Kaohsiung 804, Taiwan, ROC;

Institute of Marine Geology and Chemistry, National Sun Yat-sen University, Kaohsiung 804, Taiwan, ROC,State Key Laboratory of Marine Environmental Science, College of Oceanography and Environmental Science, Xiamen University, Xiamen, Fujian 361005, PR Ch;

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正文语种英语
中图分类海洋学;
关键词
hydrothermal vent; DOM; CDOM; EEM; humification index; autochthonous index;

Absorption and fluorescence of dissolved organic matter in submarine hydrothermal vents off NE Taiwan

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