Polarimetric Tornadic Debris Signature Variability and Debris Fallout Signatures
Polarimetric Tornadic Debris Signature Variability and Debris Fallout Signatures
复制标题
旋光旋涡碎片特征变异和碎片沉降特征
DOI：
10.1175/jamc-d-15-0077.1
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发表时间：
2015
影响因子：
3
通讯作者：
S. Matthew
中科院分区：
文献类型：
--
作者：
V. Broeke;S. Matthew
摘要极化雷达变量的值在龙卷风碎片特征(TDS)事件之间和通过TDS事件可能会有很大的变化。具有较高强度等级的龙卷风与较高的水平偏振反射率因子的平均值和极值以及较低的共轴相关系数ρhv有关。虽然这些变量的值在报告的龙卷风生命周期中经常波动，但在龙卷风消亡后立即进行的体积扫描中，ZHH重复地降低，ρHV重复地增加。土地覆盖对TDSS中的极化变量值的影响相对较小，尽管近雷达城市TDSS可能显示相对较高的ZHH值。热带气旋的面积范围通常比接近地面的范围大，尽管在最强烈的龙卷风中这一趋势可能会逆转。TDS可见的最大高度是龙卷风强度的函数，而不是土地覆盖或环境切变和不稳定的函数。残骸通常会在一次。
AbstractValues of polarimetric radar variables may vary substantially between and through tornadic debris signature (TDS) events. Tornadoes with higher intensity ratings are associated with higher average and extreme values of reflectivity factor at horizontal polarization ZHH and lower values of copolar cross-correlation coefficient ρhv. Although values of these variables often fluctuate through reported tornado life cycles, ZHH repeatably decreases and ρhv repeatably increases across the volume scan immediately following reported tornado demise. Land cover has a relatively small effect on values of the polarimetric variables within TDSs, although near-radar urban TDSs may exhibit relatively high ZHH values. TDS areal extent is typically larger aloft than near the surface, although this trend may reverse in the most intense tornadoes. Maximum altitude to which a TDS is visible is more strongly a function of tornado intensity than of land cover or ambient shear and instability. Debris often disappears onc...