Enhancement of ice-phase precipitation caused by thermal forcing produces ghost echoes over the Tibetan Plateau

Enhancement of ice-phase precipitation caused by thermal forcing produces ghost echoes over the Tibetan Plateau
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热强迫引起的冰相降水增强在青藏高原上空产生幽灵回波

DOI:
10.1038/s41612-021-00199-2
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发表时间:
2021-08
影响因子:
9
通讯作者:
Yunfei Fu
Yunfei Fu
中科院分区:
地球科学1区
文献类型:
--
作者:
Yilun Chen;Aoqi Zhang;Shumin Chen;Chaoyong Tu;Weibiao Li;Yunfei Fu

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摘要 高风暴是否会产生强降水目前是一个有争议的话题。我们利用双频降水雷达七年的观测发现,青藏高原上空存在着罕见但独特的垂直降水结构。雷达回波峰值高于冰点高度,我们将其称为“幽灵回波”。鬼回波的存在增加了回波顶部的高度,但抑制了其下方液滴尺寸的增加,从而削弱了近地表降水。与正常回声相比,幽灵回声在下午出现的频率更高。热强迫产生的潜在不稳定环境是鬼回波的主要原因,而不是风切变的动力因素。幻影回波本质上是一种冰相降水增强机制,代表一种高而弱的降水类型。它的存在增强了我们目前对降水性质的认识。
AbstractWhether tall storms produce heavy precipitation is currently a controversial topic. Here, we used seven years of observations from the dual-frequency precipitation radar and found that there is a rare but unique vertical precipitation structure over the Tibetan Plateau. The radar echo peaks above the freezing height, which we refer to as a “ghost echo”. The existence of a ghost echo increases the echo-top height but suppresses the increase in droplet size below it, and therefore weakens the near-surface precipitation. Compared with normal echoes, ghost echoes appear more often in the afternoon. The potentially unstable environment produced by thermal forcing is the main cause of ghost echoes, rather than the dynamic factor of wind shear. The ghost echo, which is essentially a mechanism of ice-phase precipitation enhancement, represents a type of tall but weak precipitation. Its existence adds to our current perception of the nature of precipitation.
北半球冬季青藏高原西部降水的大尺度动力学和水汽来源,地球物理研究杂志
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发表时间: 2020
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