How dual‐polarization radar observations can be used to verify model representation of secondary ice
How dual‐polarization radar observations can be used to verify model representation of secondary ice
复制标题
如何使用双偏振雷达观测来验证次生冰的模型表示
DOI：
10.1002/2016jd025381
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
A. Lerber
中科院分区：
文献类型：
--
作者：
V. Sinclair;D. Moisseev;A. Lerber
在本文中，它是讨论如何双极化雷达观测可以用来验证二次冰生产的模型表示。研究了一个事件，其中雪中增强的比微分相位（Kdp）特征发生在温度介于−8 ° C和−3°C之间的海拔高度。通过结合雷达和地面降水观测结果表明，这些双极化雷达信号最有可能是由浓度超过主要冰参数化预期的冰引起的。它还表明，新形成的冰粒容易聚集，这可能解释为什么Kdp值似乎是在0.2-0.3°/km的C波段雷达。对于感兴趣的事件，进行多个高分辨率（1 km）天气研究和预报（WRF）模型模拟。当使用默认版本的莫里森微物理方案时，模拟的冻结水凝物的数浓度远低于观测值，模拟的冰粒子浓度与初级冰参数化的预期值相当。当删除莫里森方案的Hallett-Mossop部分中的雨水和云水混合比的特设阈值时，模拟了超过主要冰参数化预期值的更高的冰浓度。这些结果表明，需要重新审视业务天气预报模型中二次冰生成的参数化，并且可以使用双极化雷达观测与辅助观测相结合来验证它们。
In this paper it is discussed how dual‐polarization radar observations can be used to verify model representations of secondary ice production. An event where enhanced specific differential phase, Kdp, signatures in snow occur at the altitudes where temperatures lie in the range between −8 and −3°C is investigated. By combining radar and surface‐based precipitation observations it is shown that these dual‐polarization radar signatures are most likely caused by ice with concentrations exceeding those expected from primary ice parameterizations. It is also shown that the newly formed ice particles readily aggregate, which may explain why Kdp values seem to be capped at 0.2–0.3°/km for a C band radar. For the event of interest, multiple high‐resolution (1 km) Weather Research and Forecasting (WRF) model simulations are conducted. When the default versions of the Morrison microphysics schemes were used, the simulated number concentration of frozen hydrometeors is much lower than observed and the simulated ice particle concentrations are comparable with values expected from primary ice parameterizations. Higher ice concentrations, which exceed values expected from primary ice parameterizations, were simulated when ad hoc thresholds for rain and cloud water mixing ratio in the Hallett‐Mossop part of the Morrison scheme were removed. These results suggest that the parameterization of secondary ice production in operational weather prediction models needs to be revisited and that dual‐polarization radar observations, in conjunction with ancillary observations, can be used to verify them.
影响因子：
6.3
作者：
Crawford, I.;Bower, K. N.;Blyth, A.
通讯作者：
Blyth, A.