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  Discharge of dissolved black carbon from a fire-affected intertidal system

Dittmar, T., Paeng, J., Gihring, T. M., Suryaputra, I. G. N. A., & Huettel, M. (2012). Discharge of dissolved black carbon from a fire-affected intertidal system. Limnology and Oceanography, 57(4), 1171-1181.

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Dittmar, T.1, Author              
Paeng, J., Author
Gihring, T. M., Author
Suryaputra, I. G. N. A.2, Author              
Huettel, M.3, Author              
Affiliations:
1Marine Geochemistry Group, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481705              
2ICBM MPI Bridging Group for Marine Geochemistry, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481703              
3Flux Group, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481701              

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 Abstract: We report substantial tidal fluxes of dissolved black carbon (DBC) in a fire‐affected marsh in the northern Gulf of Mexico. DBC was molecularly determined as benzenepolycarboxylic acids in a tidal creek, adjacent rivers, and the coastal ocean. Supported by stable carbon isotope and in situ fluorescence measurements, three sources of dissolved organic carbon (DOC) were identified that mixed conservatively in the coastal system: groundwater from salt marshes, river water, and seawater. Groundwater was the main source of DBC to the creek. The highest DBC concentrations of up to 41 µmol C L−1 (7.2% of DOC) were found in the creek at low tide, compared with < 18 µmol C L−1 in all other samples. Over the studied tidal cycle, we determined a runoff (load per drainage area) of 3700 moles DBC (44 kg C) km−2 of salt marsh. This is high compared with the Apalachicola River, where the annual DBC runoff is on the order of 104 mol (120 kg C) km−2 yr−1. In the marsh, it would require ∼ 20 tidal cycles similar to the one that we studied to remove all black carbon produced during one fire event. Because a spring tide was studied, our estimate is as an upper limit. DBC is ubiquitous in the global ocean, and dissolution and subsequent lateral transport appear to be important removal mechanisms for soil black carbon. Our study, which provides a snapshot in time and space, demonstrates that tidal fluxes may be primary carriers of DBC, and therefore tidal pumping and groundwater discharge cannot be ignored in assessing the continental runoff of DBC.

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Language(s): eng - English
 Dates: 2012-07
 Publication Status: Published in print
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 634653
ISI: 000307269300022
 Degree: -

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Title: Limnology and Oceanography
Source Genre: Journal
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Publ. Info: Waco, Tex., etc. : American Society of Limnology and Oceanography.
Pages: - Volume / Issue: 57 (4) Sequence Number: - Start / End Page: 1171 - 1181 Identifier: ISSN: 0024-3590
CoNE: https://pure.mpg.de/cone/journals/resource/954925421091