Observations of Transient Linear Organization and Nonlinear Scale Interactions in Lake-Effect Clouds. Part I: Transient Linear Organization
Observations of Transient Linear Organization and Nonlinear Scale Interactions in Lake-Effect Clouds. Part I: Transient Linear Organization
复制标题
湖效应云中瞬态线性组织和非线性尺度相互作用的观测。
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Verlinde
中科院分区：
文献类型：
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作者：
N. Miles;J. Verlinde
1998年1月13-14日湖致对流试验期间的冷空气爆发具有正浮力通量大、风切变中等的特征。虽然理论预测在这些条件下只有细胞组织，但观察到瞬态线性组织。宾夕法尼亚州立大学的94 ghz垂直指向云雷达（对云滴和冰晶很敏感）获得的垂直速度时间序列被用来记录冬季湖泊效应事件中发生的组织变化。云雷达部署在南密歇根湖顺风岸，测量了几个云内高度的高时间分辨率垂直速度数据。事件持续时间为18小时，包括线性组织向细胞组织转换的三个周期。在这个由两部分组成的系列的第一部分中，作者记录了线性组织对流的瞬态性质，并评估了大气条件的作用。
Abstract The cold-air outbreak of 13–14 January 1998 during the Lake-Induced Convection Experiment was characterized by large positive buoyancy flux and moderate wind shear. Although theory predicts only cellular organization in these conditions, transient linear organization was observed. Time series of vertical velocity obtained with the Pennsylvania State University 94-GHz vertically pointing cloud radar, which is sensitive to cloud droplets and ice crystals, were used to document the changes in organization that occurred during this wintertime lake-effect event. The cloud radar was deployed on the downwind shore of southern Lake Michigan and measured high-temporal-resolution vertical velocity data at several in-cloud heights. The duration of the event was 18 h, encompassing three cycles of linear organization switching to cellular organization. In Part I of this two-part series the authors document the transient nature of the linearly organized convection and evaluate the role of atmospheric condition...