Figure 5 - uploaded by Kyle T Manley
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Study area. a) Location of the Tweed Caldera drainage basin within Australia. b) Elevation map of the caldera with the erosion stages labeled. c) Surface geology of the study site (orange = Cenozoic volcanic rock, light green = Jurassic period Metamorphosed rock) (Surface geology obtained from Commonwealth of Australia, Geoscience Australia 2017). .
Source publication
As anthropogenic forcing continues to rapidly change worldwide climate, consequential landscape impacts will continue to coincide. In this study, a landscape evolution model called Badllands (BAsin anD LANscape DynamicS) is utilized to project if and how the landscape of the Tweed Caldera catchment, in Eastern Australia, dynamically reacts to shift...
Contexts in source publication
Context 1
... Mount Warning Shield Volcano ( Figure 5) was chosen for this study due to the unique topography of the caldera that was created by over ...
Citations
... conducted as a month long independent study project at the University of Sydney and progressed into a Senior Bachelor Honor's Degree Thesis at the University of Colorado Boulder (Manley, 2018). ...
As anthropogenic forcing continues to rapidly modify worldwide climate, impacts on landscape changes will grow. Olivine weathering is a natural process that sequesters carbon out of the atmosphere, but is now being proposed as a strategy that can be artificially implemented to assist in the mitigation of anthropogenic carbon emissions. We use the landscape evolution model Badlands to identify a region (Tweed Caldera catchment in Eastern Australia) that has the potential for naturally enhanced supply of mafic sediments, known to be a carbon sink, into coastal environments. Although reality is more complex than what can be captured within a model, our models have the ability to unravel and estimate how erosion of volcanic edifices and landscape dynamics will react to future climate change projections. Local climate projections were taken from the Australian government and the IPCC in the form of four alternative pathways. Three additional scenarios were designed, with added contributions from the Antarctic Ice Sheet, to better understand how the landscape/dynamics might be impacted by an increase in sea level rise due to ice sheet tipping points being hit. Three scenarios were run with sea level held constant and precipitation rates increased in order to better understand the role that precipitation and sea level plays in the regional supply of sediment. Changes between scenarios are highly dependent upon the rate and magnitude of climatic change. We estimate the volume of mafic sediment supplied to the erosive environment within the floodplain (ranging from ∼27 to 30 million m³ by 2100 and ∼78–315 million m³ by 2500), the average amount of olivine within the supplied sediment under the most likely scenarios (∼7.6 million m³ by 2100 and ∼30 million m³ by 2500), and the amount of CO2 that is subsequently sequestered (∼53–73 million tons by 2100 and ∼206–284 million tons by 2500). Our approach not only identifies a region that can be further studied in order to evaluate the efficacy and impact of enhanced silicate weathering driven by climate change, but can also help identify other regions that have a natural ability to act as a carbon sink via mafic rock weathering.
