文章基本信息

标题：Evaluation of the WDM6 scheme in the simulation of number concentrations and drop size distributions of warm-rain hydrometeors: comparisons with the observations and other schemes
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作者：Jiaxu GUO ; Hengchi LEI ; Di CHEN 等
期刊名称：Atmospheric and Oceanic Science Letters
印刷版ISSN：1674-2834
电子版ISSN：2376-6123
出版年度：2019
卷号：12
期号：6
页码：458-466
DOI：10.1080/16742834.2019.1670584
语种：English
出版社：Taylor and Francis Ltd
摘要：The number concentrations and drop size distributions (DSDs) of warm-rain hydrometeors play an important role in the simulation of microphysical processes. To evaluate the performance of the WDM6 scheme, which predicts the cloud number concentration (Nc) explicitly in aspects of warm-rain hydrometeors number concentrations and DSDs, the simulation of the WDM6 scheme is compared with airborne observations of a flight trial, as well as with the simulations of the Thompson scheme and Morrison scheme. Results show that the WDM6 scheme produces smaller (larger) cloud (rain) number concentrations and wider cloud DSDs compared to the observations, with the largest biases at upper levels of stratiform cloud (SC). The Thompson scheme and the Morrison scheme, both of which set the Nc as a constant, compare better to the observations than the WDM6 scheme in aspects of Nc and DSD. Sensitivity tests of the initial cloud condensation nuclei (CCN) number concentration (CCN0) of the WDM6 scheme show that a better choice of the initial CCN0 may improve the simulation of convective cloud but helps little in terms of SC. The simulation of rain number concentration and DSD is not sensitive to the CCN0 in the WDM6 scheme.
其他摘要：暖云粒子数浓度及粒子谱对微物理过程的模拟有着重要影响，不同于许多微物理方案，WDM6 方案显示预报云滴数浓度.为评估其模拟效果，本文对比了WDM6方案与Thompson方案、 Morrison方案在一次飞机观测试验中的模拟结果.结果表明：相比于观测结果，WDM6方案模拟云（雨）滴数浓度偏小（大），云滴谱较宽，特别是对于层状云中上部的模拟偏差较大.尽管Thompson方案和Morrison方案将云滴数浓度设置为常数，但这两种方案的云滴数浓度及云滴谱却更接近于观测.对于WDM6方案初始云凝结核数目（CCN 0 ）的敏感性试验表明，改变 CCN 0 能够改进WDM6方案对于对流云的模拟，但对于层状云的模拟结果影响较小.
关键词：Warm-rain hydrometeor number concentration;drop size distribution;airborne observation
其他关键词：WDM6 scheme暖云粒子数浓度##粒子谱##飞机观测##WDM6方案