Modeling the Hydrological Cycle in the Atmosphere of Mars: Influence of a Bimodal Size Distribution of Aerosol Nucleation Particles
Modeling the Hydrological Cycle in the Atmosphere of Mars: Influence of a Bimodal Size Distribution of Aerosol Nucleation Particles
复制标题
模拟火星大气中的水文循环：气溶胶成核颗粒双峰尺寸分布的影响
DOI：
10.1002/2017je005384
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
and Paul Hartogh
中科院分区：
文献类型：
--
作者：
Dmitry S. Shaposhnikov;Alexander V. Rodin;Alexander S. Medvedev;Anna A. Fedorova;Takeshi Kuroda;and Paul Hartogh
我们提出了一个新的实施方案的水文循环计划到火星大气环流模型。该模型包括水蒸气和冰的半拉格朗日传输方案，并考虑了它们之间相变的微观物理。水文方案包括饱和，成核，颗粒生长，升华和沉积的过程下，一个可变的尺寸分布的假设。该计划已实施到马克斯普朗克研究所火星大气环流模式和测试假设单峰和双峰对数正态分布的冰凝结核。我们提出了一个模拟的年度变化，水蒸气的水平和垂直分布，冰云与现有的观测仪器在火星轨道器上的比较。占双峰气溶胶粒子分布改善了模拟的年度水文循环，包括预测的冰云质量，不透明度，数密度和粒子半径。增加的数密度和较低的成核率使模拟的云不透明度更接近观测。模拟结果表明，过量的小气溶胶粒子模拟的水汽分布的影响很弱。
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 and tested assuming monomodal and bimodal lognormal 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 on board Mars orbiters. The accounting for bimodality of aerosol particle distribution improves the simulations of the annual hydrological cycle, including predicted ice clouds mass, opacity, number density, and particle radii. The increased number density and lower nucleation rates bring 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.