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   Hansell, DA; Carlson, CA (Ed.)

   The transport and transformation of carbon in subseafloor environments is a significant component of past, present, and future global fluxes. Seawater’s dissolved organic matter (DOM) enters the subseafloor and undergoes complex reactions including microbial processing, interactions with the rock matrix, and thermal restructuring and remineralization to carbon dioxide. Large shifts in concentrations, isotopic compositions, and molecular abundances provide a rich source of information about the environments through which fluids have circulated. Broad patterns linking geological settings to the fate of organic molecules can now be drawn, including the wide-scale removal of seawater DOM in ridge-flank systems, and large additions of abiotically synthesized compounds into fluids that interact with mantle rocks. Outstanding questions remain concerning the role of hydrothermal circulation as a source of refractory organic matter and its impact on the isotopic signature of deep oceanic DOM. 

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3. Dissolved organic matter in submarine hydrothermal systems

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5. Dissolved Organic Matter in the Global Ocean: A Primer

   https://doi.org/10.3390/gels7030128  

   Hansell, Dennis A.; Orellana, Mónica V. (September 2021, Gels)

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   Marine dissolved organic matter (DOM) holds ~660 billion metric tons of carbon, making it one of Earth’s major carbon reservoirs that is exchangeable with the atmosphere on annual to millennial time scales. The global ocean scale dynamics of the pool have become better illuminated over the past few decades, and those are very briefly described here. What is still far from understood is the dynamical control on this pool at the molecular level; in the case of this Special Issue, the role of microgels is poorly known. This manuscript provides the global context of a large pool of marine DOM upon which those missing insights can be built. 

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