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

机译：台湾东北部海底热液喷口中溶解有机物的吸收和荧光

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摘要

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.
机译：由于尚未报道海底热液喷口的DOM吸收和荧光，因此热液喷口作为海洋中发色和荧光溶解有机物（CDOM和FDOM）的源或汇的作用尚不清楚。在2010年8月的两次航行中，从台湾东北部两个浅海底热液喷口收集了水样，分别是白色喷口和黄色喷口。吸收和激发发射矩阵荧光光谱用于表征DOM的光学特性。非常特殊的环境。白色排气孔处波长为300 nm（a_（300））时的吸收系数要高得多，而其下方1 m（2.52±0.88 m〜（-1））处的吸收系数要比背景（0.34±0.12 m〜（-1） ））。这表明白色排气孔是海水中CDOM的来源。使用平行因子分析确定了三个荧光成分：腐殖质样Cl，酪氨酸样C3和C2，它们是色氨酸样和海洋腐殖质样成分的组合。 C1和C3（但不是C2）在白色通风口处和在其下方1 m处具有最高的荧光强度，表明通风口作为腐殖质和酪氨酸类DOM的来源。在我们的第一次航行中，黄色通风口的样品的a_（300）也高于周围海水，但荧光强度C（1-3）与周围海水相似。总体而言，低腐殖化指数（HIX：1.40±0.30）和高本地化指数（BIX：1.27±0.63）表明DOM可能具有较低的腐殖质含量，并且主要是研究区域内生物学或细菌来源的自噬菌体。 HIX和BIX的双线图显示，来自热液喷口的DOM具有与陆地洞穴和泉水相似的特征，但与孤立的腐殖质不同。

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  • 来源
    《Marine Chemistry》 |2012年第2012期|p.64-71|共8页
  • 作者

    Liyang Yang; Huasheng Hong; Weidong Guo; Chen-Tung Arthur Chen; Pei-I Pan; Chun-Chin Feng;

  • 作者单位

    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 China;

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

    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;

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

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  • 正文语种 eng
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  • 关键词

    hydrothermal vent; DOM; CDOM; EEM; humification index; autochthonous index;

    机译：热液喷口;DOM;CDOM;EEM;谦卑指数本地指数;

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