A Case Study of Cloud Radar Observations and Large-Eddy Simulations of a Shallow Stratiform Orographic Cloud, and the Impact of Glaciogenic Seeding
A Case Study of Cloud Radar Observations and Large-Eddy Simulations of a Shallow Stratiform Orographic Cloud, and the Impact of Glaciogenic Seeding
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DOI：
10.1175/jamc-d-16-0364.1
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发表时间：
2017-04
影响因子：
3
通讯作者：
X. Chu;B. Geerts;L. Xue;B. Pokharel
中科院分区：
文献类型：
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作者：
X. Chu;B. Geerts;L. Xue;B. Pokharel
摘要冰川催化对降水的影响仍然不确定，主要是因为降水的噪声性质。业务播种计划往往针对冷季地形云，因为它们丰富的过冷液态水。这种云是复杂的，因为常见的自然播种从上面（播种机-喂食器效应）或从下面（吹雪）。在这里，观测，主要是从一个剖面机载多普勒雷达，和数值模拟被用来检查一个非常浅的（<1公里），主要是阻塞云，不是自然从高处或从下面播种的冰川播种的影响。这种云有有限但持久的过冷液态水，云底（顶部）温度为−12°C（−16°C），自然只产生非常轻微的降雪。天气研究和预报模型的大涡模拟在100米分辨率捕捉到观测到的上游稳定性和风廓线，并再现了地形流，云，...
AbstractThe impact of glaciogenic seeding on precipitation remains uncertain, mainly because of the noisy nature of precipitation. Operational seeding programs often target cold-season orographic clouds because of their abundance of supercooled liquid water. Such clouds are complicated because of common natural seeding from above (seeder–feeder effect) or from below (blowing snow). Here, observations, mainly from a profiling airborne Doppler radar, and numerical simulations are used to examine the impact of glaciogenic seeding on a very shallow (<1 km), largely blocked cloud that is not naturally seeded from aloft or from below. This cloud has limited but persistent supercooled liquid water, a cloud-base (top) temperature of −12°C (−16°C), and produces only very light snowfall naturally. A Weather Research and Forecasting Model large-eddy simulation at 100-m resolution captures the observed upstream stability and wind profiles and reproduces the essential characteristics of the orographic flow, cloud, and...