Chromophoric dissolved organic matter in inland waters: Present knowledge and future challenges

Area of Science:

• Aquatic biogeochemistry
• Environmental chemistry
• Remote sensing

Background:

• Chromophoric dissolved organic matter (CDOM) significantly influences aquatic ecosystem biogeochemical cycles and energy flow.
• A comprehensive understanding of CDOM dynamics is vital for effective aquatic ecosystem management.
• CDOM research integrates diverse fields like analytical chemistry, biogeochemistry, remote sensing, and global environmental change.

Purpose of the Study:

• To provide a comprehensive review of recent advancements in CDOM research within inland waters.
• To synthesize current knowledge on CDOM characterization, distribution, sources, composition, and fate.
• To identify future research directions for a better understanding of CDOM dynamics.

Main Methods:

• Optical, isotopic, and mass spectrometric techniques for CDOM characterization (abundance, composition, sources).
• Remote sensing for high-resolution mapping of CDOM distribution.
• Analysis of watershed-related processes influencing CDOM dynamics (rainfall, groundwater, wastewater).

Main Results:

• Characterization methods, remote sensing, and biogeochemical cycling are key research areas for CDOM.
• Watershed processes like discharge and biogeochemical cycling are primary drivers of CDOM dynamics.
• Photochemical and microbial degradation of CDOM accelerate nutrient cycling and contribute to greenhouse gas emissions.

Conclusions:

• CDOM plays a critical role in inland water biogeochemistry, influencing nutrient cycling and climate.
• Integrated approaches combining analytical, remote sensing, and biogeochemical methods are essential for studying CDOM.
• Further research is needed to fully elucidate CDOM dynamics and their broader environmental implications.