Uncertainty of modelled bioenergy with carbon capture and storage due to variability of input data

Uncertainty of modelled bioenergy with carbon capture and storage due to variability of input data
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由于输入数据的可变性,碳捕获和储存的生物能源建模存在不确定性

DOI:
10.1111/gcbb.12803
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发表时间:
2021
期刊:
影响因子:
5.6
通讯作者:
Shepherd A
Shepherd A
中科院分区:
工程技术2区
文献类型:
--
作者:
Shepherd A

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不确定性是固有的模拟预测生物能源与碳捕获和储存(BECCS),但有时处理外围。不确定性的一个来源来自不同的气候和土壤输入。我们研究了英国70年Miscanthus × Lacteus(M × g)预测的变化,BECCS和输入数据的环境影响。我们使用UKCP18 RCP8.5气候预测和协调世界土壤数据库(HWSD)土壤序列的队列数据集作为MiscanFor生物能源模型的输入。英国平均每10年出现1次低年产量,但产量不确定性因地区而异,特别是英格兰南部和东部。BECCS的预测结果在各队列之间相似,同一数据库集合的气候队列产生的变化(3.99 ± 0.14 t C ha−1year−1)大于每个网格块土壤序列产生的不确定性(3.96 ± 0.03 t C ha−1year−1)。这是支持的年度时间序列,显示多变的年度气候和密切的产量BECCS气候关系,但部分对应的产量和BECCS与最大的土壤变异。每个HWSD土壤网格正方形包含多达10个排名的土壤类型。优势土壤通常有超过50%的覆盖度,这表明为什么从组合土壤序列的BECCS没有显着不同的BECCS使用的优势土壤类型。在英格兰和威尔士目前的耕作限制区,全气候集合与全土壤序列相结合的平均BECCS为3.98 ± 0.14 t C ha−1year−1。生物能源作物的平均季节性土壤水分亏缺为65.79 ± 4.27 mm,相关土壤碳增益为0.22 ± 0.03 t C ha−1year−1,生物能源原料计算为131 GJ t−1y−1。不确定性是特定于所使用的输入数据集和模型的。这项研究的信息是,以确保不确定性解释时,土地利用影响的模型预测。
Uncertainty is inherent in modelled projections of bioenergy with carbon capture and storage (BECCS), yet sometimes treated peripherally. One source of uncertainty comes from different climate and soil inputs. We investigated variations in 70‐year UK projections ofMiscanthus × giganteus(M × g), BECCS and environmental impacts with input data. We used cohort datasets of UKCP18 RCP8.5 climate projections and Harmonized World Soil Database (HWSD) soil sequences, as inputs to the MiscanFor bioenergy model. Low annual yield occurred 1 in 10 years as a UK‐average but yield uncertainty varied regionally, especially south and east England. BECCS projections were similar among cohorts, with variation resulting from climate cohorts of the same database ensemble (3.99 ± 0.14 t C ha−1year−1) larger than uncertainty resulting from soil sequences in each grid block (3.96 ± 0.03 t C ha−1year−1). This is supported by annual time series, displaying variable annual climate and a close yield–BECCS–climate relationship but partial correspondence of yield and BECCS with maximal soil variability. Each HWSD soil grid square contains up to 10 ranked soil types. Predominant soil commonly has over 50% coverage, indicating why BECCS from combined soil sequences were not significantly different from BECCS using the dominant soil type. Mean BECCS from the full climate ensemble combined with the full soil sequences, over the current area of cropping limits in England and Wales, is 3.98 ± 0.14 t C ha−1year−1. The bioenergy crop has a mean seasonal soil water deficit of 65.79 ± 4.27 mm and associated soil carbon gain of 0.22 ± 0.03 t C ha−1year−1, with bioenergy feedstock calculated at 131 GJ t−1y−1. The uncertainty is specific to the input datasets and model used. The message of this study is to ensure that uncertainty is accounted for when interpreting modelled projections of land use impacts.
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