Ice Nucleation Parameterization and Relative Humidity Distribution in Idealized Squall-Line Simulations
Ice Nucleation Parameterization and Relative Humidity Distribution in Idealized Squall-Line Simulations
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DOI：
10.1175/jas-d-16-0356.1
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发表时间：
2017-08
影响因子：
3.1
通讯作者：
M. Diao;G. Bryan;H. Morrison;J. Jensen
中科院分区：
文献类型：
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作者：
M. Diao;G. Bryan;H. Morrison;J. Jensen
从一个理想化的模拟输出的飑线进行了比较，在现场飞机为基础的观测深对流云和化学活动。对流周围的相对湿度分布进行了比较，1-Hz的飞机观测（10250米水平尺度）和模拟使用双矩体微物理方案在三个水平网格间距：Δx = 0.25，1，和4公里。比较集中在冰过饱和区（ISSRs）的水平范围，最大和平均相对湿度相对于冰（RHi）在ISSRs，和冰的微物理特性卷云演变过程中，在0.25和1公里的模拟提供更好的结果比4公里的模拟。在ISSRs内，所有的模拟平均代表了水汽水平非均匀性对ISSR形成的主要贡献，但这种贡献的变异性比观测值大。最好的结果是由Δx = 0.25公里的模拟与...
AbstractOutput from idealized simulations of a squall line are compared with in situ aircraft-based observations from the Deep Convective Clouds and Chemistry campaign. Relative humidity distributions around convection are compared between 1-Hz aircraft observations (≈250-m horizontal scale) and simulations using a double-moment bulk microphysics scheme at three horizontal grid spacings: Δx = 0.25, 1, and 4 km. The comparisons focus on the horizontal extent of ice supersaturated regions (ISSRs), the maximum and average relative humidity with respect to ice (RHi) in ISSRs, and the ice microphysical properties during cirrus cloud evolution, with simulations at 0.25 and 1 km providing better results than the 4-km simulation. Within the ISSRs, all the simulations represent the dominant contributions of water vapor horizontal heterogeneities to ISSR formation on average, but with larger variabilities in such contributions than the observations. The best results are produced by a Δx = 0.25-km simulation with th...