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Unveiling ongoing biogeochemical dynamics of CDOM from surface to deep ocean.
Nat. Commun. 16:5202 (2025)
Understanding the dynamics of marine dissolved organic carbon (DOC) is essential for predicting its role in carbon cycling and its response to climate change. Here, we unveil molecular transformations of marine chromophoric dissolved organic matter (CDOM) across the global ocean using Ultraviolet-visible spectroscopy. Significant variability in CDOM composition within the epi- and mesopelagic layers ( < 1000 m) correlates with physicochemical parameters, driven by irradiation, primary production, biological activity, transport, and riverine inputs. In the bathypelagic layer (1000-5000 m), up to 18.2% of highly conjugated molecules transform into low-molecular-weight CDOM, despite stable DOC concentrations. This dynamic process sustains biomass production and respiration in deep ocean, contributing a carbon flux of 3-24 Pg C yr-1-up to an order of magnitude more than the fast-sinking particulate organic carbon flux. Our findings offer insights into the molecular transformation of deep-ocean DOM and underscore the need to reassess the bathypelagic DOC pool's role in the global carbon cycle.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Dissolved Organic-matter; Carbon; Export; Dark; Zooplankton; Degradation; Indicators; Tracer; Flux
ISSN (print) / ISBN
2041-1723
e-ISSN
2041-1723
Journal
Nature Communications
Quellenangaben
Volume: 16,
Issue: 1,
Article Number: 5202
Publisher
Nature Publishing Group
Publishing Place
London
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Research Unit BioGeoChemistry and Analytics (BGC)
Grants
High-Performance Computing Platform of the Center for Life Science at Peking University
Hainan Provincial Financial Support Project
Natural Science Foundation of China
Hainan Provincial Financial Support Project
Natural Science Foundation of China