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Isotopic composition of oceanic dissolved black carbon reveals non-riverine source

https://doi.org/10.1038/s41467-019-13111-7

Wagner, Sasha ; Brandes, Jay ; Spencer, Robert G. M. ; Ma, Kun ; Rosengard, Sarah Z. ; Moura, Jose Mauro S. ; Stubbins, Aron ( November 2019 , Nature Communications)

Abstract
A portion of the charcoal and soot produced during combustion processes on land (e.g., wildfire, burning of fossil fuels) enters aquatic systems as dissolved black carbon (DBC). In terms of mass flux, rivers are the main identified source of DBC to the oceans. Since DBC is believed to be representative of the refractory carbon pool, constraining sources of marine DBC is key to understanding the long-term persistence of carbon in our global oceans. Here, we use compound-specific stable carbon isotopes (δ¹³C) to reveal that DBC in the oceans is ~6‰ enriched in¹³C compared to DBC exported by major rivers. This isotopic discrepancy indicates most riverine DBC is sequestered and/or rapidly degraded before it reaches the open ocean. Thus, we suggest that oceanic DBC does not predominantly originate from rivers and instead may be derived from another source with an isotopic signature similar to that of marine phytoplankton.

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Mineral protection regulates long-term global preservation of natural organic carbon

https://doi.org/10.1038/s41586-019-1280-6

Hemingway, Jordon D. ; Rothman, Daniel H. ; Grant, Katherine E. ; Rosengard, Sarah Z. ; Eglinton, Timothy I. ; Derry, Louis A. ; Galy, Valier V. ( June 2019 , Nature)

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The effect of sample drying temperature on marine particulate organic carbon composition: Drying temperature effects on marine POC

https://doi.org/10.1002/lom3.10245

Rosengard, Sarah Z. ; Lam, Phoebe J. ; McNichol, Ann P. ; Johnson, Carl G. ; Galy, Valier V. ( May 2018 , Limnology and Oceanography: Methods)
Factors regulating the Great Calcite Belt in the Southern Ocean and its biogeochemical significance

https://doi.org/10.1002/2016GB005414

Balch, William M. ; Bates, Nicholas R. ; Lam, Phoebe J. ; Twining, Benjamin S. ; Rosengard, Sarah Z. ; Bowler, Bruce C. ; Drapeau, Dave T. ; Garley, Rebecca ; Lubelczyk, Laura C. ; Mitchell, Catherine ; et al ( August 2016 , Global Biogeochemical Cycles)