Dual-Polarization Radar Data Analysis of the Impact of Ground-Based Glaciogenic Seeding on Winter Orographic Clouds. Part II: Convective Clouds
Dual-Polarization Radar Data Analysis of the Impact of Ground-Based Glaciogenic Seeding on Winter Orographic Clouds. Part II: Convective Clouds
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DOI：
10.1175/jamc-d-15-0056.1
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发表时间：
2015-10
影响因子：
3
通讯作者：
Xiaoqin Jing;B. Geerts
中科院分区：
文献类型：
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作者：
Xiaoqin Jing;B. Geerts
本文是由两部分组成的系列文章的第二篇，旨在利用X波段双极化雷达探索地面冰川成因播撒对冬季地形云的影响。它重点关注了2012年1-2月观测到的三个浅到中深地形对流的案例，这三个案例是在怀俄明州马德雷山脉上空进行的AGI播种云影响调查(ASCII)项目的一部分。在每一次风暴中，上游的大部分弗劳德数都超过1，表明水流畅通。低层位势不稳定的存在解释了地形对流。由于云底温度较低，云中几乎没有过冷的液态水。冰晶摄影显示，雪主要是通过扩散和聚集方式生长的。为了检验碘化银(AgI)的播种效果，确定了五个研究区：两个目标区和三个控制区。在控制区和目标区之间，以及在处理或播种期和未处理期之间进行比较。
AbstractThis second paper of a two-part series aims to explore the ground-based glaciogenic seeding impact on wintertime orographic clouds using an X-band dual-polarization radar. It focuses on three cases with shallow to moderately deep orographic convection that were observed in January–February of 2012 as part of the AgI Seeding Cloud Impact Investigation (ASCII) project over the Sierra Madre in Wyoming. In each of the storms the bulk upstream Froude number exceeded 1, suggesting unblocked flow. Low-level potential instability was present, explaining orographic convection. The clouds contained little supercooled liquid water on account of the low cloud-base temperature. Ice-crystal photography shows that snow mainly grew by diffusion and aggregation. To examine the seeding effect of silver iodide (AgI), five study areas are defined: two target areas and three control areas. Comparisons are made between the control and target areas as well as between a treated, or seeded, period and an untreated period....