Distribution of Humic Fluorescent Dissolved Organic Matter in Lake Shihwa: the Role of the Redox Condition

被引:5
作者
Kim, Jeonghyun [1 ,2 ]
Kim, Tae-Hoon [3 ]
机构
[1] Seoul Natl Univ, Sch Earth & Environm Sci, Seoul, South Korea
[2] Natl Inst Fisheries Sci, Jeju Fisheries Res Inst, Fisheries Resources & Environm Res Div, Jeju, South Korea
[3] Jeju Natl Univ, Dept Earth & Marine Sci, Jeju, South Korea
关键词
Fluorescent dissolved organic matter; Dissolved organic carbon; Lake Shihwa; Hypoxia; Dissolved oxygen; Redox condition; OPTICAL-PROPERTIES; MACKENZIE RIVER; BENTHIC FLUX; SEDIMENT; MARINE; SEA; VARIABILITY; PHOSPHORUS; CARBON; WATER;
D O I
10.1007/s12237-018-00491-0
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Hypoxia has occurred worldwide in coastal and marginal oceans. The redox condition has recently garnered major interest as a favorable condition for delivering sedimentary organic matter to the water column. In this study, we measured the fluorescence of fluorescent dissolved organic matter (FDOM) in brackish Lake Shihwa, Korea, in which hypoxic conditions are typically observed during summer. Especially, fluorescent intensities of the humic FDOM (FDOMH) were relatively high during summer, with a relatively lower dissolved oxygen (DO) level, and exponentially increased with decreasing DO concentrations. The results indicated that the production of FDOMH is associated with anaerobic processes. It was further supported by a significantly positive relationship between FDOMH and ammonium. Based on the relatively low values of redox potential (up to 60.0 mV) and high concentration of phosphate with the low DO level, this enrichment of FDOMH seems to be linked to the input of anoxic porewater. Using a simple schematic diagram, the contribution of FDOMH from reducing environments is comparable to that from stream water, which is known to be a major source in coastal regions. This study highlights that the redox condition is a key factor contributing to the production of FDOMH in coastal marine environments.
引用
收藏
页码:578 / 588
页数:11
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