Interactions between sunlight and microorganisms influence dissolved organic matter degradation along the aquatic continuum

CO2 emissions from inland surface waters to the atmosphere are almost as large as the net carbon transfer from the atmosphere to Earth's land surface. This large flux is supported by dissolved organic matter (DOM) from land and its complete oxidation to CO2 in freshwaters. A critical nexus in t...

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Published inLimnology and oceanography letters Vol. 3; no. 3; pp. 102 - 116
Main Authors Cory, Rose M., Kling, George W.
Format Journal Article
LanguageEnglish
Published Hoboken John Wiley & Sons, Inc 01.06.2018
Wiley
Subjects
Aquatic ecosystems
Atmosphere
Budgets
Carbon cycle
Carbon dioxide
Creeks & streams
Dissolved organic matter
Gene expression
Lakes
Light
Metabolism
Microorganisms
Oceans
Oxidation
Photochemistry
Photodegradation
Respiration
Rivers
Sunlight
Surface water
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ISSN2378-2242
2378-2242
DOI10.1002/lol2.10060

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Summary:CO2 emissions from inland surface waters to the atmosphere are almost as large as the net carbon transfer from the atmosphere to Earth's land surface. This large flux is supported by dissolved organic matter (DOM) from land and its complete oxidation to CO2 in freshwaters. A critical nexus in the global carbon cycle is the fate of DOM, either complete or partial oxidation. Interactions between sunlight and microbes control DOM degradation, but the relative importance of photodegradation vs. degradation by microbes is poorly known. The knowledge gaps required to advance understanding of key interactions between photochemistry and biology influencing DOM degradation include: (1) the efficiencies and products of DOM photodegradation, (2) how do photo‐products control microbial metabolism of photo‐altered DOM and on what time scales, and (3) how do water and DOM residence times and light exposure interact to determine the fate of DOM moving across the landscape to oceans?
Bibliography:Edited by: Emily Stanley and Paul del Giorgio
RMC and GWK led the manuscript effort and contributed equally to the literature synthesis, analysis of current evidence, and writing the manuscript.
Data Availability Statement
Data used in this paper is archived at the Arctic Data Center
This article is an invited paper to the Special Issue: Carbon cycling in inland waters
Author Contribution Statement
https://arcticdata.io/catalog/#view/doi:10.18739/A2SV8Z
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ISSN:2378-2242
2378-2242
DOI:10.1002/lol2.10060