Multiscale modeling of the atmospheric fate and transport of mercury
Multiscale modeling of the atmospheric fate and transport of mercury
复制标题
DOI：
10.1029/2000jd000273
复制
发表时间：
2001-11
影响因子：
--
通讯作者：
C. Seigneur;P. Karamchandani;K. Lohman;K. Vijayaraghavan;R. Shia
中科院分区：
文献类型：
--
作者：
C. Seigneur;P. Karamchandani;K. Lohman;K. Vijayaraghavan;R. Shia
采用多尺度方法对大气中汞的去向和输送进行了数值模拟。用两个不同的空间尺度模拟了(1)全球大气汞的循环和(2)潜在敏感区的大气汞沉积。全球模拟是使用我们的全球汞化学传输模型(CTM)的更新版本进行的。嵌入的大陆模拟是使用区域/大陆CTM团队的更新版本进行的。模拟使用了1998年的气象学和1998/1999年的排放清单。模型仿真结果表明，与以前的仿真相比，性能有所改善。例如，全球模拟显示了汞物种的背景浓度、半球间梯度和垂直梯度，这与现有的测量结果一致。模拟的汞湿沉降通量与美国汞沉积网络的数据比较表明，决定系数(R2)为0.75，偏差很小(−为3%)，平均粗差为21%。讨论了汞排放的形态、汞的大气化学以及汞物种的干湿沉积过程等不确定度的主要来源。
A numerical simulation of the atmospheric fate and transport of mercury (Hg) was conducted using a multiscale approach. Two different spatial scales were used to simulate (1) the global cycling of atmospheric Hg and (2) the atmospheric deposition of Hg in potentially sensitive areas. The global simulation was conducted using an updated version of our global Hg chemical transport model (CTM). The imbedded continental simulation was conducted using an updated version of the regional/continental CTM, TEAM. Simulations were conducted using 1998 meteorology and 1998/1999 emission inventories. Model simulation results show improved performance compared to earlier simulations. For example, the global simulation shows background concentrations of Hg species, interhemispheric gradients, and vertical gradients that are consistent with available measurements. The comparison of simulated Hg wet deposition fluxes with data from the Mercury Deposition Network in the United States shows a coefficient of determination (r2) of 0.75, little bias (−3%), and an average gross error of 21%. The major remaining sources of uncertainties, which include speciation of Hg emissions, Hg atmospheric chemistry, and dry and wet deposition processes for Hg species, are discussed.