Rapid-Scan, Polarimetric, Doppler Radar Observations of Tornadogenesis and Tornado Dissipation in a Tornadic Supercell: The “El Reno, Oklahoma” Storm of 24 May 2011*
Rapid-Scan, Polarimetric, Doppler Radar Observations of Tornadogenesis and Tornado Dissipation in a Tornadic Supercell: The “El Reno, Oklahoma” Storm of 24 May 2011*
复制标题
龙卷超级单体中龙卷发生和龙卷消散的快速扫描、偏振、多普勒雷达观测：2011 年 5 月 24 日的“俄克拉荷马州埃尔里诺”风暴*
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
J. Snyder
中科院分区：
文献类型：
--
作者：
J. Houser;H. Bluestein;J. Snyder
摘要2011年5月24日，一部移动的快速扫描X波段偏振多普勒雷达（RaXPol）在俄克拉荷马州埃尔雷诺附近产生两个龙卷风时收集了超级单体的数据。第一个龙卷风，评级为EF-3，记录从增强到衰减，和第二个龙卷风，被评为EF-5的起源和增强随后也documented. This研究的目的是检查与龙卷风（i）的旋转的时空演变的第一龙卷风减弱到亚龙卷风强度和（ii）作为第二龙卷风形成和增强。据发现，削弱没有单调发生。在雷达体积的深度（~4 km）内，龙卷风强度到亚龙卷风强度的转变发生在不到30 s的时间内，但这种行为取决于用于定义龙卷风的多普勒切变的阈值。同样，龙卷风强度的多普勒速度偶发生在30秒的周期内的所有海拔。此外，演变…
AbstractOn 24 May 2011, a mobile, rapid-scan, X-band, polarimetric, Doppler radar (RaXPol) collected data on a supercell as it produced two tornadoes near El Reno, Oklahoma. The first tornado, rated an EF-3, was documented from intensification to decay, and the genesis and intensification of a second tornado that was rated an EF-5 was subsequently also documented.The objective of this study is to examine the spatiotemporal evolution of the rotation associated with the tornadoes (i) as the first tornado weakened to subtornadic intensity and (ii) as the second tornado formed and intensified. It is found that weakening did not occur monotonically. The transition from tornadic to subtornadic intensity over the depth of the radar volume (~4 km) occurred in less than 30 s, but this behavior is contingent upon the threshold for Doppler shear used to define the tornado. Similarly, the onset of a tornadic-strength Doppler velocity couplet occurred within a 30-s period over all elevations.Additionally, the evolutio...