1. Chromophoric dissolved organic matter in inland waters: Present knowledge and future challenges
- Author
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Erik Jeppesen, Qian Yu, Lei Zhou, Yongqiang Zhou, Liuqing Zhang, Kun Shi, Xiaolong Yao, Yunlin Zhang, and Weining Zhu
- Subjects
Inland waters ,Nutrient cycle ,Biogeochemical cycle ,Environmental Engineering ,010504 meteorology & atmospheric sciences ,Aquatic ecosystem ,Biogeochemistry ,Absorption coefficient ,Remote sensing ,010501 environmental sciences ,Microbial decomposition ,01 natural sciences ,Pollution ,Colored dissolved organic matter ,Oceanography ,Water column ,Chromophoric dissolved organic matter ,Dissolved organic carbon ,Environmental Chemistry ,Environmental science ,Waste Management and Disposal ,Groundwater ,0105 earth and related environmental sciences - Abstract
Chromophoric dissolved organic matter (CDOM) plays an important role in the biogeochemical cycle and energy flow of aquatic ecosystems. Thus, systematic and comprehensive understanding of CDOM dynamics is critically important for aquatic ecosystem management. CDOM spans multiple study fields, including analytical chemistry, biogeochemistry, water color remote sensing, and global environmental change. Here, we thoroughly summarize the progresses of recent studies focusing on the characterization, distribution, sources, composition, and fate of CDOM in inland waters. Characterization methods, remote sensing estimation, and biogeochemistry cycle processes were the hotspots of CDOM studies. Specifically, optical, isotope, and mass spectrometric techniques have been widely used to characterize CDOM abundance, composition, and sources. Remote sensing is an effective tool to map CDOM distribution with high temporal and spatial resolutions. CDOM dynamics are mainly determined by watershed-related processes, including rainfall discharge, groundwater, wastewater discharges/effluents, and biogeochemical cycling occurring in soil and water bodies. We highlight the underlying mechanisms of the photochemical degradation and microbial decomposition of CDOM, and emphasize that photochemical and microbial processes of CDOM in inland waters accelerate nutrient cycling and regeneration in the water column and also exacerbate global warming by releasing greenhouse gases. Future study directions to improve the understanding of CDOM dynamics in inland waters are proposed. This review provides an interdisciplinary view and new insights on CDOM dynamics in inland waters.
- Published
- 2020