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IPCC的排放因子高估了N₂O来自农业沟的排放

Wenxin Wu¹, Sophie A Comer-Warner^2,3, Mike Peacock^4,5

¹Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China.

Environmental science & technology

|November 12, 2024

概括

农业沟排放出大量的氧化 (N2O),但目前的估计太高了. 这项研究发现,沟的排放因子较低,这对于准确的全球N2O预算至关重要.

科学领域:

环境科学环境科学
农业科学农业科学
大气化学大气化学

背景情况:

农业沟是氧化 (N2O) 的重要来源.
目前排放因子 (EFs) 对沟,分类在地下水 (EF5g),可能高估N2O排放.
有限的数据阻碍了对沟对全球N2O预算的贡献的准确评估.

研究的目的:

计算北中国平原农业沟 (EF5g) 的排放因子.
为了将计算的EF5g与政府间气候变化专门委员会 (IPCC) 的默认值进行比较.
评估来自农业沟的区域N2O排放量及其对N2O总预算的贡献.

主要方法:

在中国北方平原进行了区域范围的实地运动.
使用度方法 (N2O-N/NO3--N) 计算EF5g.
量化平均N2O度和来自沟的区域N2O排放.

主要成果:

区域平均EF5g为0.0028,不到IPCC默认值0.006.0 的一半.
这表明,根据目前的IPCC方法论,沟的N2O排放量被严重高估了.
该地区的农业沟排放量为1.14 ± 0.86 Gg N2O-N yr-1,占耕地直接排放量的3.8%.

结论:

IPCC的默认EF5g高估了农业沟的N2O排放.
尽管EF值较低,但沟对区域N2O排放有很大贡献.
精制EF5g对于准确的全球N2O预算评估至关重要,特别是随着农业面积的扩大.

关键词:

农业沟农业沟排放因子 (EF) 排放因子温室气体的温室气体是什么间接排放的间接排放.化肥化肥化肥化肥氧化是什么?氧化是什么?营养成分营养成分的营养.

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