Evaluating the 2019 IPCC refinement for estimating methane conversion factors in Canada

Hung, Chih-Yu; VanderZaag, Andrew; Smith, Ward; Grant, Brian

doi:10.1016/j.scitotenv.2022.155325

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…There is a lack of publications on the effects of an implementation of the IPCC-2019 guidelines on national GHG emissions from agriculture and livestock. One recent paper discussed the guidelines' changes for manure-related CH 4 emissions in Canada but failed to address feed-related issues [13].…”

Section: Introductionmentioning

confidence: 99%

Implementing IPCC 2019 Guidelines into a National Inventory: Impacts of Key Changes in Austrian Cattle and Pig Farming

et al. 2023

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This study examined enteric and excreta emissions from cattle and pigs with a focus on effects of changed feeding practices. We assessed the impact of a revision of the Austrian Greenhouse Gas and Air Pollutant Inventory (national method, NM), i.e., the implementation of the Tier2-method of the IPCC-2019 guidelines, to a more dynamic integration of past and present feeding practices. Cattle—in particular, dairy cows—had the highest contribution to enteric CH4 emissions and to nitrogen (Nex) and volatile-solid (VSex) excretion, independent of the assessment method (NM or IPCC-2019). These emissions as well as excreta quantities are directly associated with feeding. The most relevant changes from implementing IPCC-2019 were (i) reduced enteric CH4 over the entire time series and (ii) increased Nex and VSex, especially for the period from 1990 to 2005. Additionally, uncertainties in the emissions and excreta were analyzed and related to the quantities of protein consumed. From 1990 to 2020, favorable trends per unit of protein were shown due to increased performance and concomitantly reduced animal numbers. The changes were especially pronounced for CH4, Nex, and VSex from dairy cows (−40% to −46%) but also substantial for other cattle (−26% to −31%), breeding pigs (−12% to −28%), and partially growing-fattening pigs (−3% to −20%). Future mitigation potential may result from reduced dietary crude-protein content, especially in pigs, and the use of feed additives. Feed additives for ruminants with enteric CH4-mitigating effects showed a particularly high reduction potential for the total amount of greenhouse gases from the livestock sector.

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Section: Introductionmentioning

confidence: 99%

Implementing IPCC 2019 Guidelines into a National Inventory: Impacts of Key Changes in Austrian Cattle and Pig Farming

et al. 2023

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“…This method can easily estimate MCF across a large spatial scale for various management scenarios by estimating manure temperature ( T m ) based on air temperature ( T a ) as described above, for example, Hung et al. (2022).…”

Section: Introductionmentioning

confidence: 99%

“…For example, manure temperature is set to lag 1 month behind air temperature, and manure temperature can be set to be lower than air temperature (a damping factor) if manure is stored over winter and not removed in the spring. This method can easily estimate MCF across a large spatial scale for various management scenarios by estimating manure temperature (T m ) based on air temperature (T a ) as described above, for example, Hung et al (2022).…”

Section: Introductionmentioning

confidence: 99%

Perspectives on peak liquid manure temperature with implications for methane emissions

et al. 2023

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Methane emissions from liquid manure storage are currently estimated with a methane conversion factor (MCF) based on manure temperature inputs or air temperatures as a substitute in the 2019 IPCC Tier 2 method. However, differences between peak manure temperature and peak air temperature (T diff ) in warm seasons are likely to occur and result in poor estimates of MCF and methane emissions. To address this concern, this study aims to investigate the relationship between the T diff and ratio of manure surface area to manure volume (R s:v ) using a mechanistic model and by analyzing farm-scale measurement studies across Canada. Positive correlations between T diff and R s:v were found using a modeling approach and from farm-scale results (r = 0.55, p = 0.06). T diff ranged from -2.2 to 2.6˚C in farm-scale results mainly collected from eastern Canada. We suggest that manure volume and surface area, in addition to removal frequency, could be used to estimate T diff and be part of the criteria for improving manure temperature estimates, which could lead to improved estimates of MCF.

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Methane-to-methanol conversion and power co-generation on palladium: nickel supported on antimony tin oxide catalysts in a polymeric electrolyte reactor-fuel cell (PER-FC)

et al. 2022

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Evaluating the 2019 IPCC refinement for estimating methane conversion factors in Canada

Cited by 7 publications

References 22 publications

Implementing IPCC 2019 Guidelines into a National Inventory: Impacts of Key Changes in Austrian Cattle and Pig Farming

Implementing IPCC 2019 Guidelines into a National Inventory: Impacts of Key Changes in Austrian Cattle and Pig Farming

Perspectives on peak liquid manure temperature with implications for methane emissions

Methane-to-methanol conversion and power co-generation on palladium: nickel supported on antimony tin oxide catalysts in a polymeric electrolyte reactor-fuel cell (PER-FC)

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