Quantifying Carbon Burial Rates As A Critical Ecosystem Service In The Mississippi Delta
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Quantifying Carbon Burial Rates As A Critical Ecosystem Service In The Mississippi Delta

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  • Personal Author:
  • NOAA Program & Office:
  • Sea Grant Program:
    LSU (Louisiana Sea Grant)
  • Description:
    The Mississippi River Delta has been active over the entire Holocene creating an expansive sediment package that spans the entire Louisiana coast and can be greater than 100 m thick in some places. This sediment package contains peat deposited by wetlands, and clastic material deposited in bays and floodplains or by channels. It is well-known that the current wetland sediment is a large carbon sink that plays a role in the global carbon cycle. In this study, we determine total organic carbon content of both wetland and non-wetland sediment that was deposited between 2,000 and 3,300 years ago (6 to 14 m depth). We find that the relationship observed between organic material to organic carbon that exists in the current wetland sediment (top 24 cm) does not hold for the sediment analyzed here. This shows that we need a better understanding of deep carbon sequestration in the Holocene sediment package to determine the role the Mississippi Delta has played in carbon sequestration throughout its existence. Despite these current uncertainties, we see that organic carbon is sequestered in both wetland and nonwetland environments. This work shows that it might be possible to use stratigraphy to estimate the total amount of carbon sequestered in the entire Holocene sediment package, as we show that different depositional environments that are characterized by different sediment types have different carbon accumulation rates.
  • Format:
    PDF
  • Document Type:
    Technical Report
  • License:
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    CC0 Public Domain
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    Submitted
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