冰晶增长参数化方案评估：四个降水个例的模拟研究

发布时间：2018-07-28 10:58

【摘要】：本文基于二维云分辨模式,分别采用Hsieetal.(1980),Kruegeretal.(1995),Zeng etal.(2008)和Shenetal.(2014)四种冰晶增长参数化方案,模拟热带到中纬度地区的四个降水个例。通过云降水收支、云的微物理过程和热量收支分析,评估四种参数化方案对降水、水凝物、云的微物理过程和热量变化的影响。研究发现:(1)Shen方案模拟的时间-区域平均降水率与观测值更加接近。与高冰核浓度的Zeng方案相比,Shen方案减少了雨滴收集云滴造成的雨滴增长和云滴到冰滴的凝结增长,导致总的水凝物丢失减少。与Hsie,Krueger和中低冰核浓度的Zeng方案相比,Shen方案通过减少水汽净凝结和水凝物丢失得到较好地平均降水率模拟。(2)高冰核浓度的Zeng方案产生异常增多的冰滴模拟,Shen方案通过减少过饱和水汽凝华成冰滴和云滴到冰滴的凝结增长,削减了异常增多的冰滴模拟。高冰核浓度的Zeng方案和Shen方案引起对流层中上层辐射加热增多,这与它们模拟的冰滴在对流层中上层大量增多有关。(3)高冰核浓度设置的Zeng方案导致模拟区域-平均的局地温度变化在对流层上层出现异常减小值,这与它在热带个例中导致垂直热量通量辐合减少和在中纬度个例中导致凝结加热减少有关。尽管高冰核浓度的Zeng方案相比其他方案引起质量加权平均的辐射加热增多,但是它在热带个例中引起地表感热通量减少和在中纬度个例中引起潜热加热减少,最终导致四种参数化方案计算的模拟区域-质量加权平均的局地温度变化基本一致。
[Abstract]:Based on the two-dimensional cloud resolution model, four parameterized ice crystal growth schemes, Hsieetal. (1980) Kruegeretal. (1995) Zeng etal. (2008) and Shenetal. (2014), are used to simulate four precipitation cases from tropical to mid-latitude. Through the analysis of cloud precipitation budget, cloud microphysical process and heat budget, the effects of four parameterized schemes on precipitation, water condensate, cloud microphysical process and heat change were evaluated. The results show that: (1) the time-region average precipitation rate simulated by the Shen scheme is closer to the observed value. Compared with the Zeng scheme with high concentration of ice nuclei, the increase of raindrops caused by raindrop collection and the condensation of droplets from cloud to ice decreased, resulting in the decrease of total hydration loss. Compared with the Zeng scheme of Hsiegne Krueger and medium and low ice nuclei concentration, the Zeng scheme can simulate the average precipitation rate by reducing the net condensation of water vapor and the loss of water condensate. (2) the Zeng scheme with high ice core concentration produces abnormal increase of ice droplet simulation Shen scheme. Overreducing the condensation growth of supersaturated water vapor into ice droplets and cloud droplets to ice droplets, Reduced the unusually large number of ice droplet simulations. The Zeng and Shen schemes with high ice core concentration increase the radiation heating in the upper troposphere. This is related to the large increase of the simulated ice droplets in the upper troposphere. (3) the Zeng scheme with high ice core concentration results in abnormal decreases of the simulated region-average local temperature in the upper troposphere. This is related to the decrease of vertical heat flux convergence in tropical cases and condensation heating in mid-latitude cases. Although the Zeng scheme with high ice core concentration results in an increase in mass-weighted average radiative heating compared with other schemes, it causes a decrease in surface sensible heat flux in tropical cases and a decrease in latent heat heating in mid-latitude cases. The local temperature variations of the simulated area-mass weighted average calculated by the four parameterized schemes are basically consistent.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P426.6

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