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An Assessment of the Dynamic Global Warming Impact Associated with Long-Term Emissions from Landfills.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-01-16 , DOI: 10.1021/acs.est.9b04066
Yixuan Wang 1 , James W Levis 1 , Morton A Barlaz 1
Affiliation  

Landfills are a major contributor of anthropogenic CH4 emissions. Since the greenhouse gas (GHG) emissions associated with landfilling waste can occur over decades to centuries, the standard static approach to estimating global warming impacts may not accurately represent the global warming impacts of landfills. The objective of this study is to assess the implications of using 100 yr and 20 yr static and dynamic global warming potential (GWP) approaches to estimate the global warming impacts from municipal solid waste landfills. A life-cycle model was developed to estimate GHG emissions for three gas treatment cases (passive venting, flare, CH4 conversion to electricity) and four decay rates. For the 100 yr GWP, other model uncertainties (e.g., static GWP values, decay rate, moisture content, or gas collection efficiency) generally had a larger effect on the estimated global warming impact than the choice of static versus dynamic GWP methods. This shows that when comparing single-point GWP values, the choice of static versus dynamic is relatively unimportant for most landfills. While dynamic GWPs consider temporal variance and provide useful estimates for the warming over a set time horizon, for most comparative analyses, static values provide reasonable bounds for the actual 100 yr warming impact.

中文翻译:

对与填埋场长期排放相关的全球变暖动态影响的评估。

垃圾填埋场是人为甲烷排放量的主要来源。由于与垃圾填埋场相关的温室气体排放可能会持续数十年到数百年,因此估算全球变暖影响的标准静态方法可能无法准确地代表垃圾填埋场对全球变暖的影响。这项研究的目的是评估使用100年和20年静态和动态全球变暖潜势(GWP)方法来估算城市固体垃圾填埋场对全球变暖的影响。开发了一个生命周期模型来估算三种气体处理情况(被动排放,火炬,CH4转化为电能)和四种衰减率的温室气体排放量。对于100年全球升温潜能值,其他模型不确定性(例如静态全球升温潜能值,衰减率,含水量,或气体收集效率)通常比选择静态GWP方法和动态GWP方法对估计的全球变暖影响更大。这表明,在比较单点GWP值时,对于大多数垃圾填埋场而言,静态和动态的选择相对而言并不重要。尽管动态全球升温潜能值考虑了时间变化并为设定的时间范围内的变暖提供了有用的估计,但对于大多数比较分析而言,静态值为实际的100年变暖影响提供了合理的界限。
更新日期:2020-01-17
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