Journal Articles

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https://hdl.handle.net/20.500.12518/107

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Browsing Journal Articles by Author "Anderson, Aine"

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    Are stakeholders ready to transform phosphorus use in food systems? A transdisciplinary study in a livestock intensive system.
    (Elsevier, 2022-02-12) Martin-Ortega, Julia; Rothwell, Shane A.; Anderson, Aine; Okumah, Murat; Lyon, Christopher; Sherry, Erin; Johnston, Christopher; Withers, Paul J.A.; Doody, Donnacha
    Food systems worldwide are vulnerable to Phosphorus (P) supply disruptions and price fluctuations. Current P use is also highly inefficient, generating large surpluses and pollution. Global food security and aquatic ecosystems are in jeopardy if transformative action is not taken. This paper pivots from earlier (predominantly conceptual) work to develop and analyse a P transdisciplinary scenario process, assessing stakeholders potential for transformative thinking in P use in the food system. Northern Ireland, a highly livestock-intensive system, was used as case study for illustrating such process. The stakeholder engagement takes a normative stance in that it sets the explicit premise that the food system needs to be transformed and asks stakeholders to engage in a dialogue on how that transformation can be achieved. A Substance Flow Analysis of P flows and stocks was employed to construct visions for alternative futures and stimulate stakeholder discussions on system responses. These were analysed for their transformative potential using a triple-loop social learning framework. For the most part, stakeholder responses remained transitional or incremental, rather than being fundamentally transformative. The process did unveil some deeper levers that could be acted upon to move the system further along the spectrum of transformational change (e.g. changes in food markets, creation of new P markets, destocking, new types of land production and radical land use changes), providing clues of what an aspirational system could look like. Replicated and adapted elsewhere, this process can serve as diagnostics of current stakeholders thinking and potential, as well as for the identification of those deeper levers, opening up avenues to work upon for global scale transformation.
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    Evaluating scenarios to reduce phosphorus transport in surface waters from slurry applications in temperate grasslands
    (Taylor & Francis (Informa), 2022-05-30) Adams, Russell; Doody, Donnacha; Anderson, Aine; Fenton, Owen; Tuohy, Pat; Vadas, Peter
    This study evaluates a range of scenarios to reduce soluble reactive phosphorus (SRP) losses using the surface runoff phosphorus transport model (Surphos) to simulate the application of liquid manure (slurry) to grassland catchments. Surphos was applied using data from two contrasting sites in the Republic of Ireland and Northern Ireland. It explored scenarios that investigated changes to the timing of slurry applications, based both on policy (i.e. a “closed” period where regulations prohibit any slurry spreading) and on climate-based restrictions, where soil moisture and antecedent rainfall were important factors. The observed data showed a considerable spatial variability in runoff at both sites, which resulted in a corresponding variable range of SRP losses predicted by the model. However, at both sites the model results showed that maintaining a closed period led to a greater reduction in SRP losses than opening this period up to slurry applications under climate-based restrictions.
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    Evaluating the opportunity for utilising anaerobic digestion and pyrolysis of livestock manure and grass silage to decarbonise gas infrastructure : A Northern Ireland case study.
    (Elsevier, 2022-07-04) Mehta, Neha; Anderson, Aine; Johnston, Christopher; Rooney, David W.
    The need to mitigate climate change and improve energy security has led to an increasing interest in the utilisation of renewable gas to decarbonise natural gas use. Northern Ireland serves as an interesting case study to evaluate how biomethane from manure and silage material can displace natural gas. This is because of high agricultural intensity, the low penetration of gas relative to the wider UK and the modern pipeline infrastructure. This study included spatial mapping of biomethane yield and life cycle assessment for processing scenarios. The results demonstrated that current manure management i.e., storage and application of manure to grassland, results in 344 kg CO2 equivalent/person of greenhouse gases and 9.7 kg/person of ammonia being emitted. In a second scenario where collected manure and underutilised grass silage is routed to anaerobic digestion, the estimated net energy produced is 6124 GWh, with −464 kg CO2 equivalent/person. A third scenario, combining anaerobic digestion and pyrolysis, also produces 6124 GWh and 200 kilo tonnes of biochar (retaining 64% of manure phosphorus), −563 kg CO2 equivalent/person. This research evaluates the opportunity for biomethane while acknowledging that a comprehensive approach which balances energy potentials and nutrient management is required for sustainable biomethane based decarbonisation.