Mechanisms of Microbial Carbon Sequestration in the Ocean - Future Research Directions
By N. Jiao, C. Robinson, Farooq Azam, H. Thomas, F. Baltar, Hongyue Dang, N. Hardman-Mountford, Martin Johnson, David L. Kirchman, B. Koch and 11 more. 2014
222 citations recorded by the source corpus.
This paper reviews progress on understanding bi- ological carbon sequestration in the ocean with special refer- ence to the microbial formation and transformation of recal- citrant dissolved organic carbon (RDOC), the microbial car- bon pump (MCP). We propose that RDOC is a concept with a wide continuum of recalcitrance. Most RDOC compounds maintain their levels of recalcitrance only in a specific en- vironmental context (RDOCt). The ocean RDOC pool also contains compounds that may be inaccessible to microbes due to their extremely low concentration (RDOCc). This dif- ferentiation allows us to appreciate the linkage between mi- crobial source and RDOC composition on a range of tempo- ral and spatial scales. Analyses of biomarkers and isotopic records show inten- sive MCP processes in the Proterozoic oceans when the MCP could have played a significant role in regulating climate. Un- derstanding the dynamics of the MCP in conjunction with the better constrained biological pump (BP) over geological timescales could help to predict future climate trends. Inte- gration of the MCP and the BP will require new research approaches and opportunities. Major goals include under- standing the interactions between particulate organic carbon (POC) and RDOC that contribute to sequestration efficiency, and the concurrent determination of the chemical composi- tion of organic carbon, microbial community composition and enzymatic activity. Molecular biomarkers and isotopic tracers should be employed to link water column processes
Subfields: Ecology, Environmental Chemistry, Oceanography
View Paper: https://www.semanticscholar.org/paper/c35978449402a9a263dc8c2facd406f7150c19a3
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Citations in the corpus
- Microbial Surface Colonization and Biofilm Development in Marine Environments (2015, background): “Different respiration pathways have distinctly different energy conservation efficiencies (147, 304), and hypoxic and anoxic conditions usually exert a negative influence on respiratory efficiency and thus the carbon sequestration efficiency of the ocean (284, 285).”
- Temperature dependency of metabolic rates in the upper ocean: A positive feedback to global climate change? (2018, background): “…and increased efficiency of the microbial carbon pump with greater amounts of POC transferred to the pool of Recalcitrant Dissolved Organic Carbon (RDOC; Jiao et al., 2010, 2014), in parallel with a reduction of the sequestration flux and hence of the efficiency of the biological pump (Fig.”