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Carbon storage in the Mississippi River delta enhanced by environmental engineering
Nature geoscience, 2017-11, Vol.10 (11), p.846-851
[Peer Reviewed Journal]
Copyright Nature Publishing Group Nov 2017 ;ISSN: 1752-0894 ;EISSN: 1752-0908 ;DOI: 10.1038/ngeo3044
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Title:
Carbon storage in the Mississippi River delta enhanced by environmental engineering
Author:
Shields, Michael R.
;
Bianchi, Thomas S.
;
Mohrig, David
;
Hutchings, Jack A.
;
Kenney, William F.
;
Kolker, Alexander S.
;
Curtis, Jason H.
Subjects:
Accretion
;
Accumulation
;
Capacity
;
Carbon
;
Carbon capture and storage
;
Carbon emissions
;
Carbon sequestration
;
Coastal ecology
;
Coastal engineering
;
Cores
;
Deltas
;
Deposition
;
Earth
;
Earth history
;
Environmental engineering
;
Environmental regulations
;
Environmental restoration
;
Erosion
;
Erosion rates
;
Global sea level
;
Hydrologic regime
;
Hydrology
;
Lake sediments
;
Lakes
;
Low concentrations
;
Mangroves
;
Organic carbon
;
Restoration
;
Rivers
;
Sea level
;
Sea level rise
;
Sediment
;
Sediment load
;
Sedimentation
;
Sediments
;
Waxes
Is Part Of:
Nature geoscience, 2017-11, Vol.10 (11), p.846-851
Description:
River deltas have contributed to atmospheric carbon regulation throughout Earth history, but functioning in the modern era has been impaired by reduced sediment loads, altered hydrologic regimes, increased global sea-level rise and accelerated subsidence. Delta restoration involves environmental engineering via river diversions, which utilize self-organizing processes to create prograding deltas. Here we analyse sediment cores from Wax Lake delta, a product of environmental engineering, to quantify the burial of organic carbon. We find that, despite relatively low concentrations of organic carbon measured in the cores (about 0.4%), the accumulation of about 3 T m-2 of sediment over the approximate 60 years of delta building resulted in the burial of a significant amount of organic carbon (16 kg m-2 ). This equates to an apparent organic carbon accumulation rate of 250 ± 23 g m-2 yr-1 , which implicitly includes losses by carbon emissions and erosion. Our estimated accumulation rate for Wax Lake delta is substantially greater than previous estimates based on the top metre of delta sediments and comparable to those of coastal mangrove and marsh habitats. The sedimentation of carbon at the Wax Lake delta demonstrates the capacity of engineered river diversions to enhance both coastal accretion and carbon burial.
Publisher:
London: Nature Publishing Group
Language:
English
Identifier:
ISSN: 1752-0894
EISSN: 1752-0908
DOI: 10.1038/ngeo3044
Source:
ProQuest Central
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