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Quantifying uncertainties in the global mass balance of mercury

机译:量化全球汞质量平衡中的不确定性

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We quantify uncertainties in the global mass balance of mercury and identify research priorities to reduce these uncertainties. This is accomplished by developing a new spatially resolved global multimedia model (WorM ~3) that quantitatively describes the fate of mercury at a process level, and conducting an uncertainty analysis on its unit-world variant which computes similar global estimates. In our modeling approach, all mass transfer processes and reactions in ocean water, soil and vegetation, are represented as pseudo-first order; reactions in air are represented using the ratios of observed concentrations of mercury species. We use Monte Carlo analysis to estimate uncertainties in the unit-world modeled global mass balance of mercury and quantitatively identify the input parameters which contribute most to these uncertainties. A key finding is that uncertainties in input parameters that describe the rates of reduction and oxidation reactions in surface ocean contribute more than uncertainties in anthropogenic emissions to the total uncertainties in atmospheric concentration and depositional fluxes of mercury. More research should therefore be targeted toward understanding of these oceanic processes.
机译:我们对汞在全球质量平衡中的不确定性进行量化,并确定研究重点以减少这些不确定性。这是通过开发一种新的空间解析全局多媒体模型(WorM〜3)来实现的,该模型在过程级别上定量描述了汞的命运,并对其单位世界变体进行了不确定性分析,从而计算出相似的全局估计。在我们的建模方法中,海水,土壤和植被中的所有传质过程和反应均表示为伪一级。使用观察到的汞物种浓度的比率表示空气中的化学反应。我们使用蒙特卡洛分析法来估算单位世界建模的汞全球质量平衡中的不确定性,并定量确定对这些不确定性影响最大的输入参数。一个关键发现是,描述表层海洋还原和氧化反应速率的输入参数的不确定性比人为排放的不确定性对大气浓度和汞沉积通量的总体不确定性的影响更大。因此,应将更多的研究用于了解这些海洋过程。

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