A relative elevation model for a subsiding coastal forested wetland receiving wastewater effluent

Rybczyk, John; Callaway, John C.; Day, John W.

doi:10.1016/s0304-3800(98)00125-2

Cited by 64 publications

(34 citation statements)

References 27 publications

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“…Rybczyk et al (1998) in saltmarsh reported rates of 0.0004 d −1 for surface sediment and 0.00011 d −1 for within the sediment (anoxic). These are higher rates than those assumed by Kirwan and Mudd (2012) for saltmarsh (0.00055 and 0.000027 d −1 for oxic and anoxic conditions, respectively).…”

Section: Rates Of Decomposition Of Organic Matter In Tidal Marsh Manmentioning

confidence: 99%

Modeled CO2 Emissions from Coastal Wetland Transitions to Other Land Uses: Tidal Marshes, Mangrove Forests, and Seagrass Beds

2017

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The sediments of coastal wetlands contain large stores of carbon which are vulnerable to oxidation once disturbed, resulting in high levels of CO 2 emissions that may be avoided if coastal ecosystems are conserved or restored. We used a simple model to estimate CO 2 emissions from mangrove forests, seagrass beds, and tidal marshes based on known decomposition rates for organic matter in these ecosystems under either oxic or anoxic conditions combined with assumptions of the proportion of sediment carbon being deposited in either oxic or anoxic environments following a disturbance of the habitat. Our model found that over 40 years after disturbance the cumulative CO 2 emitted from tidal marshes, mangrove forests, and seagrass beds were ∼70-80% of the initial carbon stocks in the top meter of the sediment. Comparison of our estimates of CO 2 emissions with empirical studies suggests that (1) assuming 50% of organic material moves to an oxic environment after disturbance gives rise to estimates that are similar to CO 2 emissions reported for tidal marshes; (2) field measurements of CO 2 emissions in disturbed mangrove forests were generally higher than our modeled emissions that assumed 50% of organic matter was deposited in oxic conditions, suggesting higher proportions of organic matter may be exposed to oxic conditions after disturbance in mangrove ecosystems; and (3) the generally low observed rates of CO 2 emissions from disturbed seagrasses compared to our estimates, assuming removal of 50% of the organic matter to oxic environments, suggests that lower proportions may be exposed to oxic conditions in seagrass ecosystems. There are significant gaps in our knowledge of the fate of wetland sediment carbon in the marine environment after disturbance. Greater knowledge of the distribution, form, decomposition, and emission rates of wetland sediment carbon after disturbance would help to improve models.

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Section: Rates Of Decomposition Of Organic Matter In Tidal Marsh Manmentioning

confidence: 99%

Modeled CO2 Emissions from Coastal Wetland Transitions to Other Land Uses: Tidal Marshes, Mangrove Forests, and Seagrass Beds

2017

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“…Erosion increases with exposure to strong winds and wave energy (Scarton et al, 1998) while the presence of vegetation and corresponding tensile root strength can help to prevent erosion (Ward et al, 1984;VanEerdt, 1985;Stevenson et al, 1988). Marsh surface elevation changes and/or sediment erosion have been estimated by Rybczyk et al (1998) in Louisiana, USA; Pasternack (1998) in Chesapeake Bay USA; Morris et al (2002) in South Carolina, USA; and Perez-Arlucea et al (2005) in Spain.…”

Section: Introductionmentioning

confidence: 99%

Sedimentation in created freshwater riverine wetlands: 15 years of succession and contrast of methods

Mitsch

Nedrich

Harter

et al. 2014

Ecological Engineering

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“…Sea-level index points collected from thick sequences of unconsolidated intertidal 806 sediments in estuaries and marshes are therefore likely to require correction to account for 807 sediment compaction (Allen, 1995(Allen, , 2000Gehrels, 1999; Shennan and Horton, 2002; Massey et al, 808 2006). However, there is a current lack of applied theory and a shortage of models available to 809 quantify the consolidation of Holocene sediments (e.g., Paul et al, 1995; Pizzuto and Schwendt, 810 1997;Paul and Barras, 1998;Rybczyk et al, 1998; Allen, 1999 Allen, , 2000 Tovey and Paul, 2002; Williams, 811 2003; Bird et al, 2004;Massey et al, 2006). Sediment compaction is a likely explanation for the 812 vertical spread in palaeo sea-level index points in the mid-Holocene shown on the RSL histories for 813…”

Section: Zealand 635mentioning

confidence: 99%

An examination of spatial variability in the timing and magnitude of Holocene relative sea-level changes in the New Zealand archipelago

Clement

Whitehouse

Sloss

2016

Quaternary Science Reviews

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Zealand archipelago: the northern North Island (including Northland, Auckland, and the Coromandel 13 Peninsula); the southwest coast of the North Island; the Canterbury coast (South Island); and the 14 Otago coast (South Island). In the North Island the RSL highstand commenced c. 8,100-7,2400 cal yr 15 BP when present mean sea-level (PMSL) was first attained. This is c. 600-1,400 years earlier than has 16 been previously indicated for the New Zealand region as a whole, and is consistent with recent 17Holocene RSL reconstructions from Australia. In North Island locations the early-Holocene sea-level 18 highstand was quite pronounced, with RSL up to 2.75 m higher than present. In the South Island the 19 onset of highstand conditions was later, with the first attainment of PMSL being between 7,000-20 6,400 cal yr BP. In the mid-Holocene the northern North Island experienced the largest sea-level 21 highstand, with RSL up to 3.00 m higher than present. This is demonstrably higher than the 22 highstand recorded for the southwest North Island and Otago regions. A number of different drivers 23 region, while research from Australia has suggested that north-south variations in Holocene RSL 32 changes due to hydro-isostatic influences are limited or non-existent. At the regional-to local-scale, 33 post-glacial meltwater loading on the continental shelf around New Zealand is predicted by GIA 34 modelling to have a significant effect on the timing and magnitude of RSL changes through the 35 phenomenon of continental levering. The spatial variation in continental levering is controlled by the 36 configuration of the coast and the width of the adjacent continental shelf, with continental levering 37 providing a robust explanation for the observed spatial and temporal variations in RSL changes. 38Further research is required to characterise the regional and local effects of different tectonic 39 regimes, wave climates, and sediment regimes. These are potentially very significant drivers of RSL 40 variability at the regional-to local-scale. However, the magnitude of their potential effects remains 41 equivocal. 42Highlights 43  RSL histories were reconstructed for four regions in the New Zealand archipelago 44  Northern sites experience RSL rise earlier compared to southern sites 45  Northern sites experience a higher-magnitude highstand compared to southern sites 46  Long-wavelength signals from Antarctica cannot explain the observed variation in RSL 47  A range of processes potentiall...

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A relative elevation model for a subsiding coastal forested wetland receiving wastewater effluent

Cited by 64 publications

References 27 publications

Modeled CO2 Emissions from Coastal Wetland Transitions to Other Land Uses: Tidal Marshes, Mangrove Forests, and Seagrass Beds

Modeled CO2 Emissions from Coastal Wetland Transitions to Other Land Uses: Tidal Marshes, Mangrove Forests, and Seagrass Beds

Sedimentation in created freshwater riverine wetlands: 15 years of succession and contrast of methods

An examination of spatial variability in the timing and magnitude of Holocene relative sea-level changes in the New Zealand archipelago

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