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Title: Marked isotopic variability within and between the Amazon River and marine dissolved black carbon pools

Abstract

Riverine dissolved organic carbon (DOC) contains charcoal byproducts, termed black carbon (BC). As a large and slow-cycling component of the global carbon cycle, it is important to constrain the sources and fate of this elusive carbon pool during land-ocean transfer. Substantial uncertainties in regional and global-scale BC budgets persist to determine the significance of BC as a sink of atmospheric CO2, due to poor constraints on its fluvial dynamics. The Amazon River is a significant part of global BC cycling because it exports an order of magnitude more DOC, and thus dissolved BC (DBC), than any other river on Earth. We report the first spatially resolved DBC quantity and radiocarbon (Δ14C) measurements, paired with molecular-level characterization of dissolved organic matter from the Amazon River and tributaries during low discharge. The proportion of BC-like polycyclic aromatic structures decreased downstream, but marked spatially variability in abundance and Δ14C values of DBC molecular markers imply dynamic sources and cycling in a manner that is incongruent with bulk DOC. We estimate a DBC flux from the Amazon River of 1.9-2.7 Tg DBC yr-1 and find that the Amazon exports predominately young DBC to the ocean. This contrasts the old age of DBC in themore » ocean, suggesting that loss processes of modern DBC in the coastal plume must be important.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1];  [4];  [5];  [5]; ORCiD logo [1];  [6]; ORCiD logo [7]; ORCiD logo [5]; ORCiD logo [2]; ORCiD logo [1]
  1. Univ. of Zurich, Zurich (Switzerland)
  2. Univ. of Oldenburg, Oldenburg (Germany)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Univ. of Washington, Seattle, WA (United States)
  4. Univ. of Zurich, Zurich (Switzerland); ETH Zurich, Zurich (Switzerland)
  5. ETH Zurich, Zurich (Switzerland)
  6. Univ. of East Anglia, Norwich (United Kingdom)
  7. Univ. of Washington, Seattle, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1578158
Report Number(s):
PNNL-SA-144923
Journal ID: ISSN 2041-1723
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Amazon; aquatic; atmospheric; biogeochemistry; burning; carbon; carbon cycling; carbon compound; chromophoric; climate change; coastal; continuum; decomposition; dissolved organic carbon; disturbance; ecosystem; emission; estuarine; export; fire; global change; gradients; hydrology; interface; marine; metabolism; organic carbon; organic matter; river; terrestial aquatic interface; terrestrial; tidal; tidal river; transition; tropics; tropical; black carbon; pyrogenic; pyrogenic carbon

Citation Formats

Coppola, Alysha I., Seidel, Michael, Ward, Nicholas D., Viviroli, Daniel, Nascimento, Gabriela S., Haghipour, Negar, Revels, Brandi N., Abiven, Samuel, Jones, Matthew W., Richey, Jeffrey E., Eglinton, Timothy I., Dittmar, Thorsten, and Schmidt, Michael W. I. Marked isotopic variability within and between the Amazon River and marine dissolved black carbon pools. United States: N. p., 2019. Web. https://doi.org/10.1038/s41467-019-11543-9.
Coppola, Alysha I., Seidel, Michael, Ward, Nicholas D., Viviroli, Daniel, Nascimento, Gabriela S., Haghipour, Negar, Revels, Brandi N., Abiven, Samuel, Jones, Matthew W., Richey, Jeffrey E., Eglinton, Timothy I., Dittmar, Thorsten, & Schmidt, Michael W. I. Marked isotopic variability within and between the Amazon River and marine dissolved black carbon pools. United States. https://doi.org/10.1038/s41467-019-11543-9
Coppola, Alysha I., Seidel, Michael, Ward, Nicholas D., Viviroli, Daniel, Nascimento, Gabriela S., Haghipour, Negar, Revels, Brandi N., Abiven, Samuel, Jones, Matthew W., Richey, Jeffrey E., Eglinton, Timothy I., Dittmar, Thorsten, and Schmidt, Michael W. I. Thu . "Marked isotopic variability within and between the Amazon River and marine dissolved black carbon pools". United States. https://doi.org/10.1038/s41467-019-11543-9. https://www.osti.gov/servlets/purl/1578158.
@article{osti_1578158,
title = {Marked isotopic variability within and between the Amazon River and marine dissolved black carbon pools},
author = {Coppola, Alysha I. and Seidel, Michael and Ward, Nicholas D. and Viviroli, Daniel and Nascimento, Gabriela S. and Haghipour, Negar and Revels, Brandi N. and Abiven, Samuel and Jones, Matthew W. and Richey, Jeffrey E. and Eglinton, Timothy I. and Dittmar, Thorsten and Schmidt, Michael W. I.},
abstractNote = {Riverine dissolved organic carbon (DOC) contains charcoal byproducts, termed black carbon (BC). As a large and slow-cycling component of the global carbon cycle, it is important to constrain the sources and fate of this elusive carbon pool during land-ocean transfer. Substantial uncertainties in regional and global-scale BC budgets persist to determine the significance of BC as a sink of atmospheric CO2, due to poor constraints on its fluvial dynamics. The Amazon River is a significant part of global BC cycling because it exports an order of magnitude more DOC, and thus dissolved BC (DBC), than any other river on Earth. We report the first spatially resolved DBC quantity and radiocarbon (Δ14C) measurements, paired with molecular-level characterization of dissolved organic matter from the Amazon River and tributaries during low discharge. The proportion of BC-like polycyclic aromatic structures decreased downstream, but marked spatially variability in abundance and Δ14C values of DBC molecular markers imply dynamic sources and cycling in a manner that is incongruent with bulk DOC. We estimate a DBC flux from the Amazon River of 1.9-2.7 Tg DBC yr-1 and find that the Amazon exports predominately young DBC to the ocean. This contrasts the old age of DBC in the ocean, suggesting that loss processes of modern DBC in the coastal plume must be important.},
doi = {10.1038/s41467-019-11543-9},
journal = {Nature Communications},
number = 1,
volume = 10,
place = {United States},
year = {2019},
month = {9}
}

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    Works referencing / citing this record:

    Isotopic composition of oceanic dissolved black carbon reveals non-riverine source
    journal, November 2019