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Limitations on using CDOM as a proxy for DOC in temperate lakes.

Claire G Griffin1, Jacques C Finlay1, Patrick L Brezonik2

  • 1Department of Ecology, Evolution, and Behavior, University of Minnesota, Saint Paul, MN, United States.

Water Research
|August 13, 2018
PubMed
Summary

Colored dissolved organic matter (CDOM) is a reliable regional proxy for dissolved organic carbon (DOC) in lakes dominated by terrestrial sources. However, accuracy decreases in low-color lakes, requiring additional factors for precise DOC estimation.

Keywords:
Aquatic carbon cycleColored dissolved organic matterDissolved organic carbonLakes

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Area of Science:

  • Environmental Chemistry
  • Aquatic Ecology
  • Remote Sensing

Background:

  • Colored dissolved organic matter (CDOM) is crucial for understanding aquatic carbon cycling.
  • CDOM is often used as a proxy for dissolved organic carbon (DOC) in aquatic systems.
  • Variability in organic matter composition necessitates regional assessments of CDOM-DOC relationships.

Purpose of the Study:

  • To investigate ecoregion-scale differences in CDOM and DOC.
  • To evaluate the reliability of CDOM as a proxy for DOC across different lake types.
  • To identify factors influencing DOC variability and improve DOC estimation in low-color lakes.

Main Methods:

  • Analysis of CDOM (a440) and DOC from 299 lakes in the U.S. Upper Midwest.
  • Statistical correlation and multiple regression analyses.
  • Assessment of spectral slopes and specific ultraviolet absorbance (SUVA) to characterize DOM sources.

Main Results:

  • A strong correlation (R²=0.81) between CDOM and DOC was observed in colored lakes, particularly in the Northern Lakes and Forests (NLF) ecoregion.
  • Lakes in the North Central Hardwood Forests (NCHF) ecoregion exhibited low color and weaker CDOM-DOC relationships (R²=0.47).
  • In low-color lakes, incorporating total dissolved nitrogen (TDN) and CDOM improved DOC estimates, suggesting non-planktonic, low-color DOM sources.

Conclusions:

  • CDOM serves as a reliable regional proxy for DOC in lakes with predominantly terrestrial organic matter.
  • CDOM-DOC relationships are less accurate in low-color lakes, indicating a need for additional parameters.
  • Satellite-derived CDOM mapping of lake DOC has reduced accuracy in low-color lake environments.