Accelerated Sea‐Level Rise Limits Vegetation Capacity to Sequester Soil Carbon in Coastal Wetlands: A Study Case in Southeastern Australia

Sandi, Steven G.; Rodríguez, J. F.; Saco, Patricia M.; Saintilan, Neil; Riccardi, Gerardo A.

doi:10.1029/2020ef001901

Cited by 15 publications

(4 citation statements)

References 104 publications

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“…As discussed for Venice Lagoon, it is caused by a much larger increase of the root:shoot quotient along the elevation gradient parameterized in KM12. The discontinuity of the simulated OM accretion at the mangrove-saltmarsh boundary by the DA07 is because the root:shoot quotient of saltmarsh species in the DA07 is set to be higher than that of mangrove species (Kakeh et al, 2016), but these quotient ratios may also vary depending on the hydrodynamic conditions and salinity gradient (Sandi et al, 2021). In Hunter Estuary, the simulated mineral accretion on the platform shows two spatial patterns: the nearly constant rate by the algorithms of F06, T03 and KM12 and the decline rate by the other algorithms (Figure 12c).…”

Section: Simulated Mineral and Om Accretion At The Three Coastal Wetl...mentioning

confidence: 99%

A multi-algorithm approach for modeling coastal wetland eco-geomorphology

Tan,

Leung,

Liao

et al. 2023

Preprint

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Coastal wetlands play an important role in the global water and biogeochemical cycles. Climate change is making them more difficult to adapt to the fluctuation of sea levels and other environment changes. Given the importance of eco-geomorphological processes for coastal wetland resilience, many eco-geomorphology models differing in complexity and numerical schemes have been developed in recent decades. But their divergent estimates on the response of coastal wetlands to climate change indicate that substantial structural uncertainties exist in these models. To investigate the structural uncertainty of coastal wetland eco-geomorphology models, we developed a multi-algorithm model framework of eco-geomorphological processes, such as mineral accretion and organic matter accretion, within a single hydrodynamics model. The framework is designed to explore possible ways to represent coastal wetland eco-geomorphology in Earth system models and reduce the related uncertainties in global applications. We tested this model framework at three representative coastal wetland sites: two saltmarsh wetland (Venice Lagoon and Plum Island Estuary) and a mangrove wetland (Hunter Estuary). Through the model-data comparison, we showed the importance to use a multi-algorithm ensemble approach for more robust predictions of the evolution of coastal wetlands. We also find that more observations of mineral and organic matter accretion at different elevations of coastal wetlands and evaluation of the coastal wetland models at different sites of diverse environments can help reduce the model uncertainty.

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Section: Simulated Mineral and Om Accretion At The Three Coastal Wetl...mentioning

confidence: 99%

A multi-algorithm approach for modeling coastal wetland eco-geomorphology

Tan,

Leung,

Liao

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…These models are all useful for planning, however, there is an increasing desire for high precision maps of projected distribution changes to inform planning and decision making at the local scale. There are a range of models that have been developed to project coastal wetland responses to sea-level rise, largely arising from research undertaken in the USA and Europe (Fagherazzi et al, 2012;Fagherazzi et al, 2020;Wiberg et al, 2020), and rarely from locations in the southern hemisphere (Oliver et al, 2012;Rodríguez et al, 2017;Sandi et al, 2021). This is problematic as the sea-level history of coastal wetlands in the southern hemisphere, which has been relatively stable for the past few millennia, contrasts that of the northern hemisphere where shorelines have been highly influenced by glacio-isostatic adjustment (Clark and Lingle, 1979;Khan et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Modelling the response of mangroves and saltmarshes to sea-level rise: model development and validation

Rogers

Mogensen

Repina

et al. 2023

Preprint

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Models of the response of mangrove forests and saltmarshes to sea-level rise are needed to inform coastal decision making. Zero-dimensional models that simulate evolution of a point are foundational for developing spatially explicit landscape models projecting coastal wetland extents under future sea-level rise scenarios. However, both zero-dimensional and spatially explicit landscape models have suffered from insufficient calibration and inadequate validation. In this study, a zero-dimensional model framework was parameterised using real data from four sub-sites exhibiting varying rates of mineral and organic matter addition and autocompaction. The model was calibrated to correspond to tidal parameters at each sub-site and validation was undertaken across three timescales to assess model efficacy. Short-term validation encompassed the period over which measurements of surface elevation gain were determined using a network of surface elevation tables (~20 years); medium-term validation encompassed the period when higher resolution colour aerial photography was available (~35 years); and long-term validation focussed on the period of landscape evolution occurring since the mid-Holocene. The model performed well at the medium to long-term scale and was within the range of variability arising from surface elevation table measurements. This study demonstrates the critical need for site-specific data, a crucial component that is undervalued, often insufficiently resourced to generate useful data, and commonly addressed by extrapolating parameters generated from elsewhere. Validation has provided the necessary confidence for further model development at the landscape scale that will account for processes operating both vertically and laterally, such as shoreline erosion and tidal creek extension.

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“…However, climate change and anthropogenic disturbances dramatically alter salt-marsh biomorphodynamic equilibrium, jeopardizing their survival (4,6,21,22), affecting carbon sequestration (23), and even shifting marshes from net sinks to sources of carbon (4,18). Global warming, increased carbon dioxide concentration, and sea-level rise have the potential to alter biomass production, organic soil decomposition and surface accretion (19,21,24,25).…”

Section: Introductionmentioning

confidence: 99%

Blue Carbon assessment in the salt marshes of the Venice Lagoon: dimensions, variability and influence of storm-surge regulation.

Puppin,

Tognin,

Paccagnella

et al. 2023

Preprint

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Salt marshes are intertidal coastal ecosystems shaped by complex feedbacks between hydrodynamic, morphological, and biological processes. These crucial yet endangered environments provide a diverse range of ecosystem services but are globally subjected to high anthropogenic pressures, while being severely exposed to climate change impacts. The importance of salt marshes as ‘blue carbon’ sinks, deriving from their primary production coupled with rapid surface accretion, has been increasingly recognized within the framework of climate mitigation strategies. However, large uncertainties remain in salt-marsh carbon stock and sequestration estimation. In order to provide further knowledge in salt-marsh carbon assessment and investigate marsh carbon pool response to management actions, we analysed organic matter content in salt-marsh soils of the Venice Lagoon (Italy) from 60 sediment cores to the depth of 1 m and estimated organic carbon stock and accumulation rates in different areas. Organic carbon stocks and accumulation rates were highly variable in different marshes, being affected by organic and inorganic inputs and preservation conditions. Our estimates suggest that the studied marshes can absorb the same amount of carbon as 130,000 trees. However, flood regulation may reduce by 33% the annual marsh CO2 sequestration potential.

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Accelerated Sea‐Level Rise Limits Vegetation Capacity to Sequester Soil Carbon in Coastal Wetlands: A Study Case in Southeastern Australia

Cited by 15 publications

References 104 publications

A multi-algorithm approach for modeling coastal wetland eco-geomorphology

A multi-algorithm approach for modeling coastal wetland eco-geomorphology

Modelling the response of mangroves and saltmarshes to sea-level rise: model development and validation

Blue Carbon assessment in the salt marshes of the Venice Lagoon: dimensions, variability and influence of storm-surge regulation.

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