青藏高原东北部冰雹和雷雨预警的风暴单体识别特征对比分析

Abstract

Abstract: After selecting the strong storm cells with early warning significance, in this study the identification characteristics of storm cells of both hail and thunder storms before local convection were compared and analyzed based on the data of CINRAD/CD radar detection over the northeast Qinghai-Tibetan Plateau during the period from June to August of 2006-2011 so as to achieve an early warning of hail and thunder storms. Generally, the height of strong echo center of thunder storm is low and even lower than the 0 ℃-height, but the 45-dBz echo (H45) height was 1/2 higher than that of 18 dBz (H18), and its HDBZM is lower than 3.5 km. The HDBZM of the cells of hail storm was higher than 3 km, and the echo height of 30 dBz (H30) was higher than the 0 ℃-height. A early warning of hail storm could be issued when a sharp increase of vertically integrated liquid water content (VIL) of hail-storm cell occurred, the value was≥6 kg·m^-2, the maximum value of VIL≥15 kg·m^-2, and the VIL density was higher than 2.2 g·m^-3. An early warning of hail weather accompanying with rainfall could also be issued when the value of H45-H0 was≥0.5 km, and the value of VIL above the 0 ℃-height was ≥3.8 kg·m^-2. These early-warning characteristic parameters of storm cell were verified with the day-to-day radar data in September 2011, and they can be used to identify the storm types and issue the early-warning information of strong convection weather.

Key words: storm cell, hail storm, thunder storm, early warning, Qinghai-Tibetan Plateau

ZHU Ping, XIAO Jian-she, FU Yang. Analysis on Identification Characters of Storm Cells for Early Warning of Hail and Thunder Storms in the Northeast Qinghai-Tibetan Plateau[J].Arid Zone Research, 2012, 29(6): 941-948.

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Analysis on Identification Characters of Storm Cells for Early Warning of Hail and Thunder Storms in the Northeast Qinghai-Tibetan Plateau

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