Dilution limits dissolved organic carbon utilization in the deep ocean

  title={Dilution limits dissolved organic carbon utilization in the deep ocean},
  author={Jes{\'u}s Maria Arrieta and Eva Mayol and Roberta L. Hansman and Gerhard J. Herndl and Thorsten Dittmar and Carlos M. Duarte},
  pages={331 - 333}
Dilution solves the recalcitrance question The deep ocean is full of dissolved organic carbon, some of which has remained unchanged for thousands of years. What makes these compounds so resistant to microbial degradation? Perhaps their chemical structures make them intrinsically difficult to metabolize? In contrast, Arrieta et al. show that they are simply too dilute to be viable sources of energy for microorganisms (see the Perspective by Middleburg). Further experiments show that if these… 

Rapid microbial diversification of dissolved organic matter in oceanic surface waters leads to carbon sequestration

This work provides direct experimental evidence showing that within hours of labile DOM release, its breakdown and recombination with ambient DOM leads to the formation of a diverse array of new molecules in oligotrophic North Atlantic surface waters.

Escape by dilution

It is shown that dissolved organic matter in much of the deep ocean is too dilute to be consumed by microbes, and underutilization of resources in nutrient-low surface waters does not apply to the nutrient-rich deep sea.

Mixing it up in the ocean carbon cycle and the removal of refractory dissolved organic carbon

The results suggest that while refractory molecules can persist in the ocean for millennia, removal is rapid when they encounter their fate, and the observed and projected climate-induced slowdown of global overturning circulation could reduce the exposure of refraction molecules to disparate removal processes.

Molecular properties are a primary control on the microbial utilization of dissolved organic matter in the ocean

The global ocean sequesters a large amount of reduced carbon in dissolved organic molecules that can persist for centuries to millennia. The persistence of dissolved organic carbon (DOC) in the deep

Long-term stability of marine dissolved organic carbon emerges from a neutral network of compounds and microbes

It is concluded that while structurally-recalcitrant molecules exist, they are not required in the model to explain either the amount or longevity of DOC.

Limited utilization of extracted dissolved organic matter by prokaryotic communities from the subtropical North Atlantic

The ocean contains a large reservoir of dissolved organic matter (DOM) that persists for millennia. Both the very dilute concentrations of individual DOM molecules and intrinsic recalcitrance to

What Is Refractory Organic Matter in the Ocean?

About 20% of the organic carbon produced in the sunlit surface ocean is transported into the ocean’s interior as dissolved, suspended and sinking particles to be mineralized and sequestered as

Large Stimulation of Recalcitrant Dissolved Organic Carbon Degradation by Increasing Ocean Temperatures

More than 96% of organic carbon in the ocean is in the dissolved form, most of it with lifetimes of decades to millennia. Yet, we know very little about the temperature sensitivity of dissolved

Contribution of structural recalcitrance to the formation of the deep oceanic dissolved organic carbon reservoir

The results suggest that the recalcitrance of RDOC is largely related to its chemical properties, whereas dilution plays a minor role in determining the persistence of deep-ocean DOC.

Microbial Physiology Governs the Oceanic Distribution of Dissolved Organic Carbon in a Scenario of Equal Degradability

Dissolved organic carbon (DOC) forms one of the largest active organic carbon reservoirs on Earth and reaches average radiocarbon ages of several thousand years. Many previous large scale DOC models



Microbial production of recalcitrant dissolved organic matter: long-term carbon storage in the global ocean

The microbial carbon pump is proposed as a conceptual framework to address the important, multifaceted biogeochemical problem of fixed carbon in the upper ocean.

The microbial turnover of carbon in the deep-sea environment

Hidden cycle of dissolved organic carbon in the deep ocean

Significance Oceanic dissolved organic carbon (DOC) contains as much carbon as Earth’s atmosphere, yet its cycling timescales and composition remain poorly constrained. We use serial oxidation

Production of Refractory Dissolved Organic Matter by Bacteria

Results suggest that microbial processes alter the molecular structure of DOM, making it resistant to further degradation and thereby preserving fixed carbon in the ocean.

Recalcitrant dissolved organic carbon fractions.

Here, the major fractions constituting the global ocean's recalcitrant DOC pool are quantitatively and qualitatively characterized with reference to their roles in carbon biogeochemistry with a nomenclature proposed based on those roles.

Annual flux of dissolved organic carbon from the euphotic zone in the northwestern Sargasso Sea

THE export of biogenic carbon from the upper ocean is responsible for maintaining the vertical gradient of dissolved inorganic carbon and thus indirectly for regulating the level of atmospheric CO2

Radiocarbon in dissolved organic matter in the central North Pacific Ocean

The origin of dissolved organic carbon (DOC) in the ocean has been long debated. Whereas Mantoura and Woodward1 have used the conservative nature of DOC in a British estuary to conclude that ≥50% of

The impact of microbial metabolism on marine dissolved organic matter.

  • E. Kujawinski
  • Environmental Science
    Annual review of marine science
  • 2011
Recent findings from studies that examine DOM-microbe interactions from either the DOM perspective (organic geochemistry) or the microbe perspective (microbial ecology) are summarized.

Marine biogeochemistry. The invisible hand behind a vast carbon reservoir.

  • R. Stone
  • Environmental Science
  • 2010
Researchers are exploring the tantalizing prospect of sequestering CO2 in this reservoir, and it is too early to say whether the vast pool will respond to geoengineering, however.