Large-Eddy Simulations of the Impact of Ground-Based Glaciogenic Seeding on Shallow Orographic Convection: A Case Study
Large-Eddy Simulations of the Impact of Ground-Based Glaciogenic Seeding on Shallow Orographic Convection: A Case Study
复制标题
地面冰川形成播种对浅层地形对流影响的大涡模拟：案例研究
DOI：
10.1175/jamc-d-16-0191.1
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发表时间：
2017
影响因子：
3
通讯作者：
R. Rasmussen
中科院分区：
文献类型：
--
作者：
X. Chu;B. Geerts;L. Xue;R. Rasmussen
摘要：作为 AgI 播种云影响调查 (ASCII) 的一部分，本研究使用 100 米分辨率的 WRF 大涡模拟模型来研究地面冰川形成播种对 2012 年 2 月 13 日怀俄明州南部马德雷山脉上空浅层（约 2 公里深）冷基对流产生小雪阵雨的影响。详细的观察证实，模拟忠实地捕捉了地形流、对流和自然造雪，尤其是在逆风侧。处理模拟和对照模拟之间的比较表明，在这种情况下，冰川生成有效地将对流上升气流中的云水转化为冰和雪，导致地表降水增加。这一比较进一步表明，喷晶通过气相沉积增强了液态水的消耗，并增强了浮力、上升气流强度和云顶高度。这表明，尽管云层的自然过冷液态水含量较低，但动态播种概念仍然适用。但模拟...
AbstractThis study uses the WRF large-eddy simulation model at 100-m resolution to examine the impact of ground-based glaciogenic seeding on shallow (~2 km deep), cold-based convection producing light snow showers over the Sierra Madre in southern Wyoming on 13 February 2012, as part of the AgI Seeding Cloud Impact Investigation (ASCII). Detailed observations confirm that simulation faithfully captures the orographic flow, convection, and natural snow production, especially on the upwind side. A comparison between treated and control simulations indicates that glaciogenic seeding effectively converts cloud water in convective updrafts to ice and snow in this case, resulting in increased surface precipitation. This comparison further shows that seeding enhances liquid water depletion by vapor deposition, and enhances buoyancy, updraft strength, and cloud-top height. This suggests that the dynamic seeding concept applies, notwithstanding the clouds’ low natural supercooled liquid water content. But the simu...