Effects of microbial transformation on dissolved organic matter in the east Taiwan Strait and implications for carbon and nutrient cycling

Yang, Liyang; Chen, Chen‐Tung Arthur; Lui, Hon-Kit; Zhuang, Wei; Wang, Bing-Jye

doi:10.1016/j.ecss.2016.06.021

Cited by 24 publications

(18 citation statements)

References 51 publications

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“…60 µM). These DOC values are within the range reported for surface waters in general [2,4], in the northern South China Sea in 2002-2004 [38], in the East China Sea in 2009-2011 [39], and in the east Taiwan Strait in 2013 [40]. Furthermore, these values are typical of the high values found in tropical and subtropical latitudes [3].…”

Section: Laboratory Analysessupporting

confidence: 85%

“…28 was the lowest among the high-productivity stations (Table S1) due to the upward displacement of waters that were low in DOC because of organic matter decomposition. Low concentrations of DOC (60-70 µM) were also found in the upwelling area at the equatorial Pacific [9,54], and also at the shelf edge of East China Sea northeast of Taiwan, the latter of which is due to dilution by the DOC-poor Kuroshio Current's subsurface water [14,15,40]. However, mixed-layer POC remained high at this station (avg.…”

Section: Organic Carbon Distributions At the Zamboanga Upwelling Regionmentioning

confidence: 78%

“…Other factors, including a stable water column and subdued bacterial activity, could also be responsible for DOC accumulation and enrichment in a low-productivity area [14]. of Taiwan, the latter of which is due to dilution by the DOC-poor Kuroshio Current's subsurface water [14,15,40]. However, mixed-layer POC remained high at this station (avg.…”

Section: Organic Carbon Distributions At the Zamboanga Upwelling Regionmentioning

confidence: 94%

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Organic Carbon Concentrations in High- and Low-Productivity Areas of the Sulu Sea

et al. 2018

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The sequestration of anthropogenic carbon dioxide in the form of organic carbon and its eventual deposition in the sediments is an important component of the marine carbon cycle. In the Sulu Sea, Philippines, organic carbon contents in the sediments have been relatively well studied, but the processes that describe the organic carbon distributions in the water column have not been elucidated. Dissolved and particulate organic carbon (DOC, POC) concentrations were measured at several stations in the Sulu Sea during the northeast monsoon of 2007/2008 to understand the dynamics of organic carbon in this unique internal sea. Analyses of primary productivity estimates, beam attenuation coefficient (at 660 nm) profiles, and correlation coefficients among DOC, POC and other parameters (e.g., apparent oxygen utilization) at different layers of the water column indicate that surface primary productivity, upwelling, bottom intensified flows across sills, and ventilation from shallow sills, which may contain semi-labile DOC that is estimated to largely contribute to microbial respiration in the bathypelagic layer, are the major processes that affect the DOC and POC distributions in the Sulu Sea. The variability of these processes should be taken into consideration when assessing the sustainability of internal and marginal seas as carbon sinks.

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Section: Laboratory Analysessupporting

confidence: 85%

Section: Organic Carbon Distributions At the Zamboanga Upwelling Regionmentioning

confidence: 78%

Section: Organic Carbon Distributions At the Zamboanga Upwelling Regionmentioning

confidence: 94%

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Organic Carbon Concentrations in High- and Low-Productivity Areas of the Sulu Sea

et al. 2018

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“…Three fluorescence-derived indices (fluorescence index (FI), biological index (BIX) and humification index (HIX)) were calculated using the EEMs obtained from the fluorescence analysis [40][41][42] (4) where Ex represents the excitation and Em represents the emission; F is the abbreviation for fluorescence intensity.…”

Section: Uv-vis Measurements and Fluorescence Analysismentioning

confidence: 99%

“…It has been extensively investigated regarding its composition, structure, source, sink and the migration process in the aquatic environments [2,3]. DOM can directly affect nutrient cycling [4], the toxicity of organic pollutants [5], the solubility of heavy metals [6] and the aquatic ecosystem [5,7], and also indirectly influence the atmospheric CO 2 level and global climate change [8,9]. It is well known that DOM is a complex mixture of natural organic compounds found in various kinds of water bodies including rivers, lakes, glaciers, and oceans [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Seasonal Variations of Dissolved Organic Matter in the East China Sea Using EEM-PARAFAC and Implications for Carbon and Nutrient Cycling

et al. 2018

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Dissolved organic matter (DOM) plays a very important role in the dynamics of different biogeochemical processes in the global marine carbon cycle. Seasonal variations of DOM were investigated using dissolved organic carbon (DOC), absorption spectroscopy, and fluorescence excitation emission matrix-parallel factor analysis (EEM-PARAFAC) in Niushan Island in the East China Sea, off southeast Zhejiang, in winter, spring, and summer 2017. A strong positive correlation between temperature and salinity was observed in winter, whereas negative correlations were obtained in spring and summer. The results suggest that the water in the study area originates from the Changjiang River water coinciding with the direction of winds in winter. On the other hand, the Taiwan Strait water flows northward on the eastern part of the study area in summer and spring. The DOC concentration showed significant seasonal variations and was much lower in summer than in winter, but largely independent of the temperature, degree of absorption and intensity of the fluorescence component. Three tryptophan-like components (C1, C2 and C4) and one humic-like component were identified by the PARAFAC model in winter, while two tryptophan-like components (C1 and C2) and two humic-like components were illustrated in summer. The seasonal variations of DOC concentrations and intensities of the fluorescence components in the study area from winter to summer suggest that the waters in this area were influenced mainly by mixing water of the Changjiang River and the Taiwan Strait. A strongly linear relationship was found between the nutrient and the fluorescence intensities of different components in winter, reflecting the profound impacts of the dynamics of DOM on nutrient cycling.

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Comparing discrimination capabilities of fluorescence spectroscopy versus FT-ICR-MS for sources and hydrophobicity of sediment organic matter

Derrien

Lee

Shin

et al. 2017

Environ Sci Pollut Res

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Characterizing the chemical and molecular composition of sediment organic matter (SeOM) provides critical information for a complete picture of global carbon and nutrient cycles, and helps to track the sources and the fate of organic carbon in aquatic environments. In this study, we examined fluorescence properties and the molecular composition of the alkaline-extractable organic matter (AEOM) of sediments in a coastal lake (Lake Sihwa) and its surrounding creeks (rural, urban, wetland, and industrial areas). Five fluorescence-based indices and 20 molecular parameters were selected from fluorescence spectroscopy and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS), respectively, and utilized to discriminate the AEOM among five different sources as well as the chemical composition of hydrophobic acid (HoA) and hydrophilic (Hi) fractions. Ordination based on Bray-Curtis dissimilarity matrices showed that the fluorescence-based indices distinguished among urban, lake, and the three other sources, while the molecular parameters from FT-ICR-MS performed better in discriminating among the sources of rural, wetland, and industrial areas. Irrespective of the sources, the two different chemical fractions were statistically distinguished by their relative distributions of the UVA-humic-like fluorescent component and the carbohydrate molecular group. However, a rigorous test based on percent dissimilarities indicated no superior capability of either of the two tools in discriminating the sources or their two chemical fractions, which might be attributed to the inherent structural heterogeneity of SeOM and the limited analytical window of FT-ICR-MS for relatively large-sized molecules.

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Effects of microbial transformation on dissolved organic matter in the east Taiwan Strait and implications for carbon and nutrient cycling

Cited by 24 publications

References 51 publications

Organic Carbon Concentrations in High- and Low-Productivity Areas of the Sulu Sea

Organic Carbon Concentrations in High- and Low-Productivity Areas of the Sulu Sea

Seasonal Variations of Dissolved Organic Matter in the East China Sea Using EEM-PARAFAC and Implications for Carbon and Nutrient Cycling

Comparing discrimination capabilities of fluorescence spectroscopy versus FT-ICR-MS for sources and hydrophobicity of sediment organic matter

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