论文标题
建模火星大气中的水文循环：气溶胶成核颗粒的双峰尺寸分布的影响
Modeling the hydrological cycle in the atmosphere of Mars: Influence of a bimodal size distribution of aerosol nucleation particles
论文作者
论文摘要
我们将水文周期方案的新实施介绍为火星大气的一般循环模型。该模型包括用于水蒸气和冰的半拉格朗日运输方案，并说明了它们之间的相变的微物理学。水文方案包括饱和度，成核，颗粒生长，升华和沉积物的过程，假设可变尺寸分布。该方案已被实施到Max Planck Institute Martian通用循环模型（MPI-MGCM）中，并测试了冰凝结核的单型和双峰对数正态分布的测试。我们介绍了水蒸气和冰云的模拟年度变化，水平和垂直分布与船上火星轨道机上的可用观测值的比较。气溶胶颗粒分布的双模式的核算改善了年度水文循环的模拟，包括预测的冰云质量，不透明度，数量密度，粒子半径。数量密度的增加和较低的成核速率使模拟的云不相处更接近观测。模拟表明，小气溶胶颗粒过量对模拟水蒸气分布的影响较弱。
We present a new implementation of the hydrological cycle scheme into a general circulation model of the Martian atmosphere. The model includes a semi-Lagrangian transport scheme for water vapor and ice, and accounts for microphysics of phase transitions between them. The hydrological scheme includes processes of saturation, nucleation, particle growth, sublimation and sedimentation under the assumption of a variable size distribution. The scheme has been implemented into the Max Planck Institute Martian general circulation model (MPI--MGCM) and tested assuming mono- and bimodal log-normal distributions of ice condensation nuclei. We present a comparison of the simulated annual variations, horizontal and vertical distributions of water vapor and ice clouds with the available observations from instruments onboard Mars orbiters. The accounting for bi-modality of aerosol particle distribution improves the simulations of the annual hydrological cycle, including predicted ice clouds mass, opacity, number density, particle radii. The increased number density and lower nucleation rates brings the simulated cloud opacities closer to observations. Simulations show a weak effect of the excess of small aerosol particles on the simulated water vapor distributions.
