Dry deposition parameterization in a chemistry general circulation model and its influence on the distribution of reactive trace gases.
Dry deposition parameterization in a chemistry general circulation model and its influence on the distribution of reactive trace gases.
复制标题
化学大循环模型中的干沉积参数化及其对反应痕量气体分布的影响。
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
J. Lelieveld
中科院分区：
文献类型：
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作者：
L. Ganzeveld;J. Lelieveld
为了改进化学大气环流模式对地表化学反应性痕量气体的描述，提出了一个干沉降方案。化学方案模拟背景CH 4 -CO-NOx-HO x光化学，并计算例如HNO 3、NOx和O 3的浓度。一个电阻模拟用于参数化这些气体的干沉积速度。空气动力学阻力是根据模型边界层稳定性、风速和表面粗糙度计算的，并结合了准层流边界层阻力。明确计算气孔阻力，并结合代表性的角质层和叶肉电阻的每一种微量气体。新方案有助于模式的内部一致性，特别是在化学和行星边界层过程以及控制干沉降的表面特征的昼夜和季节周期方面。模型的评价表明，计算和观察到的沉积速度之间的令人满意的协议。结果与模型模拟的沉积速度保持恒定的比较表明，沉积通量和表面层痕量气体浓度的显着相对差异高达约± 35%。文中还讨论了一些不足之处，如对近地层恒定通量方法的违背、对冠层描述的缺乏以及地表水层的影响等。
A dry deposition scheme has been developed for the chemistry general circulation model to improve the description of the removal of chemically reactive trace gases at the earth's surface. The chemistry scheme simulates background CH 4 -CO-NO x -HO x photochemistry and calculates concentrations of, for example, HNO 3 , NO x , and O 3 . A resistance analog is used to parameterize the dry deposition velocity for these gases. The aerodynamic resistance is calculated from the model boundary layer stability, wind speed, and surface roughness, and a quasi-laminar boundary layer resistance is incorporated. The stomatal resistance is explicitly calculated and combined with representative cuticle and mesophyll resistances for each trace gas. The new scheme contributes to internal consistency in the model, in particular with respect to diurnal and seasonal cycles in both the chemistry and the planetary boundary layer processes and surface characteristics that control dry deposition. Evaluation of the model indicates satisfactory agreement between calculated and observed deposition velocities. Comparison of the results with model simulations in which the deposition velocity was kept constant indicates significant relative differences in deposition fluxes and surface layer trace gas concentrations up to about ±35%. Shortcomings are discussed, for example, violation of the constant flux approach for the surface layer, the lacking canopy description, and effects of surface water layers.