Aircraft Observation Analysis on Stratiform Cloud Structure near a Low Trough-Inverted Trough
Aircraft Observation Analysis on Stratiform Cloud Structure near a Low Trough-Inverted Trough
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低槽-倒槽附近层云结构的飞机观测分析
DOI：
10.1016/j.atmosres.2016.04.007
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发表时间：
2016
影响因子：
5.5
通讯作者：
Qiujuan Feng
中科院分区：
文献类型：
--
作者：
Tuanjjie Hou;Hengchi Lei;Jiefan Yang;Zhaoxia Hu;Qiujuan Feng
本研究对2009年4月30日至5月1日期间中国北部地区与高空西风槽和冷锋相关的层状降水进行了研究。我们采用天气研究与预报（WRF）模式（版本3.4.1）对降雨进行高分辨率数值模拟。我们还利用两种微物理方案进行了模拟，并进行了不含雪霜和改变云滴数浓度（CDNCs）的敏感性实验，以确定雪霜对云结构和降水的影响。然后我们将我们的结果与CloudSat、多普勒雷达和雨量计的观测结果进行了比较。与多普勒雷达观测结果的比较表明，WRF模式在捕获层状降水区域的时间和位置方面是相当成功的。与CloudSat检索结果的进一步比较表明，两种微物理方案都高估了冰和液态水的含量。无雪缘的敏感性试验表明，有无雪缘对降水分布有显著影响，但对总累积降水影响较小。在无雪缘的情况下，两种微物理方案的上升气流变化不同，主要是考虑了不同的冰粒电容和积雪缘对沉积的潜热效应。在100、250和1000 cm−3 3个不同CDNC值的敏感性实验中，雪轮率发生了变化，而CDNC的变化对降水的影响不大。
In this study, we investigated stratiform precipitation associated with an upper-level westerly trough and a cold front over northern China between 30 Apr. and 1 May 2009. We employed the Weather Research and Forecasting (WRF) model (version 3.4.1) to perform high-resolution numerical simulations of rainfall. We also conducted simulations with two microphysics schemes and sensitivity experiments without riming of snow and changing cloud droplet number concentrations (CDNCs) to determine the effect of snow riming on cloud structure and precipitation. Then we compared our results with CloudSat, Doppler radar and rain gauge observations. The comparison with the Doppler radar observations suggested that the WRF model was quite successful in capturing the timing and location of the stratiform precipitation region. Further comparisons with the CloudSat retrievals suggested that both microphysics schemes overestimated ice and liquid water contents. The sensitivity experiments without riming of snow suggested that the presence or absence of riming significantly influenced the precipitation distribution, but only slightly affected total accumulated precipitation. Without riming of snow, the changes of updrafts from the two microphysics schemes were different due to a different consideration of ice particle capacitance and latent heat effect of riming on deposition. While sensitivity experiments with three different CDNC values of 100, 250 and 1000 cm− 3suggested variations in snow riming rates, changing CDNC had little impact on precipitation.