Evolution and Vertical Structure of an Undular Bore Observed on 20 June 2015 during PECAN
Evolution and Vertical Structure of an Undular Bore Observed on 20 June 2015 during PECAN
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2015 年 6 月 20 日 PECAN 期间观察到的波状孔的演化和垂直结构
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Coltin Grasmick
中科院分区：
文献类型：
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作者：
Dana M. Mueller;B. Geerts;Zhien Wang;M. Deng;Coltin Grasmick
AbstractThis study documents the evolution of an impressive, largely undular bore triggered by an MCS-generated density current on 20 June 2015, observed as part of the Plains Elevated Convection at Night (PECAN) experiment. The University of Wyoming King Air with profiling nadir- and zenith-viewing lidars sampled the south-bound bore from the time the first bore wave emerged from the nocturnal convective cold pool and where updrafts over 10 m s−1 and turbulence in the wave’s wake were encountered, through the early dissipative stage in which the leading wave began to lose amplitude and speed. Through most of the bore’s life cycle, its second wave had a higher or equal amplitude relative to the leading wave. Striking roll clouds formed in wave crests and wave energy was detected to about 5 km AGL. The upstream environment indicates a negative Scorer parameter region due to flow reversal at midlevels, providing a wave trapping mechanism. The observed bore strength of 2.4–2.9 and speed of 15–16 m s−1 agree ...
